Power Management & Multimarket
Datasheet
Revision 2.1, 2015-01-28
BCR 320U E6327 / BCR 321U E6327
LED Driver
Edition 2015-01-28
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2015 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support
devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
be endangered.
BCR 320U E6327 / BCR 321U E6327
Datasheet 3 Revision 2.1, 2015-01-28
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™,
ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™,
POWERCODE™; PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™,
ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SOLID FLASH™, TEMPFET™,
thinQ!™, TRENCHSTOP™, TriCore™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR
development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™,
FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG.
FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of
Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data
Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of
MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics
Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA
MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF
Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™
of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas
Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes
Zetex Limited.
Last Trademarks Update 2011-11-11
Revision History
Page or Item Subjects (major cha nges since previous revision)
Revision 2.1, 2015-01-28
All Using full sales names BCR 320U E6327 / BCR 321U E6327 instead of short form BCR320U
/ BCR321U
Page 7 Halogen free logo removed
BCR 320U E6327 / BCR 321U E6327
Table of Contents
Datasheet 4 Revision 2.1, 2015-01-28
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1LED Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table of Contents
BCR 320U E6327 / BCR 321U E6327
List of Figures
Datasheet 5 Revision 2.1, 2015-01-28
Figure 1-1 Pin configuration and typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3-1 Total Power Dissipation Ptot = f(TS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3-2 Permissible Pulse Load RthJS = f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 3-4 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = Parameter . . . . . . . . . . . . 13
Figure 3-5 BCR 320U: Output Current versus Rext Iout = f(Rext), VEN = 12 V, Vout = Parameter . . . . . . . . . . . . 13
Figure 3-6 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = open, TA = Parameter . . . 14
Figure 3-7 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = 20 Ω, TA = Parameter. . . . 14
Figure 3-8 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = 3 Ω, TA = Parameter. . . . . 15
Figure 3-9 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter . . . . 15
Figure 3-10 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter. . . . . 16
Figure 3-11 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 3 Ω, TA = Parameter. . . . . . 16
Figure 3-12 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter . . . . . . . . . . . . . 17
Figure 3-13 BCR 320U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter . . . . . 17
Figure 3-14 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = Parameter . . . . . . . . . . . . 18
Figure 3-15 BCR 321U: Output Current versus Rext Iout = f(Rext), VEN = 3.3 V, Vout = Parameter . . . . . . . . . . . . 18
Figure 3-16 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = open, TA = Parameter . . . 19
Figure 3-17 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 20 Ω, TA = Parameter . . . 19
Figure 3-18 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 3 Ω, TA = Parameter . . . . 20
Figure 3-19 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter . . . . 20
Figure 3-20 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter. . . . . 21
Figure 3-21 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 3 Ω, TA = Parameter. . . . . . 21
Figure 3-22 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter . . . . . . . . . . . . . 22
Figure 3-23 BCR 321U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter . . . . . 22
Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 4-2 Application Circuit: Enabling by Connecting to VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5-1 Package Outline for SC74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5-2 Package Footprint for SC74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5-3 Tape and Reel Information for SC74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
List of Figures
BCR 320U E6327 / BCR 321U E6327
List of Tables
Datasheet 6 Revision 2.1, 2015-01-28
Table 2-1 Maximum Ratings at TA= 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-2 Thermal Resistance at TA= 25 °C, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-3 Electrical Characteristics at TA= 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-4 DC Characteristics with stabilized LED load at TA= 25 °C, unless otherwise specified . . . . . . . . 10
List of Tables
BCR 320U E6327 / BCR 321U E6327
LED Driver
Datasheet 7 Revision 2.1, 2015-01-28
1 LED Driver
1.1 Features
1.2 Applications
• Architectural LED lighting
• Channel letters for advertising, LED strips for decorative lighting
• Retail lighting in fridge, freezer case and vending machines
• Emergency lighting (e.g. steps lighting, exit way signs etc.)
1.3 General Description
The BCR 320U E6327 / BCR 321U E6327 provides a low-cost solution for driving 0.5 W LEDs with a typical LED
current of 150 mA to 200 mA. Internal breakdown voltage is higher than 16 V which is the maximum voltage the
LED driver can sustain when the output is directly connected to supply voltage.
The BCR 320U E6327 / BCR 321U E6327 can be operated with a supply voltage of more than 16 V considering
the voltage drop of the LED load which reduces the output voltage to the maximum rating of the driver.
The enable pin of BCR 320U E6327 can withstand a maximum voltage of 25 V which can be increased adding a
series resistor in front of the enable pin reducing the voltage at the enable pin below 25 V.
The digital input pin of BCR 321U E6327 allows dimming via a micro controller with frequencies up to 10 kHz.
A reduction of the output current at higher temperatures is the result of the negative temperature coefficient of -
0.2 %/K of the LED driver.
With no need for additional external components like inductors, capacitors and free wheeling diodes, the BCR
320U E6327 / BCR 321U E6327 LED drivers are a cost-efficient and PCB-area saving solution for driving 0.5 W
LEDs.
• LED drive current preset to 10 mA
• Continuous output current up to 250 mA with an external resistor
• Easy paralleling of drivers to increase current
• Supply voltage up to 25 V
• Low side current control
• Digital PWM input up to 10 kHz frequency (BCR 321U E6327)
• Up to 1 W power dissipation in a small SC74 package
• Negative thermal coefficient of -0.2 %/K reduces output current at higher temperatures
• RoHS compliant (Pb-free) package
• Automotive qualified according AEC Q101
SC74-3D
BCR 320U E6327 / BCR 321U E6327
LED Driver
Datasheet 8 Revision 2.1, 2015-01-28
Figure 1-1 Pin configuration and typical application
Sales Name Marking Pin Configuration Package
BCR 320U E6327 30 1 = EN 2; 3; 5 = OUT 4 = GND 6 = Rext SC74
BCR 321U E6327 31 1 = EN 2; 3; 5 = OUT 4 = GND 6 = Rext SC74
Pin Configuration Typical Application
EN OUT
R
ext
GND
+V
S
V
drop
2,3,51
6
4
I
out
I
EN
BCR 320 U E6327
EN
OUT
OUT GND
OUT
R
ext
1
2
3 4
5
6
R
ext
(optional )
BCR 320U E6327 / BCR 321U E6327
Electrical Characteristics
Datasheet 9 Revision 2.1, 2015-01-28
2 Electrical Characteristics
Attention: Stresses above the max. values listed here may cause permanent damage to the device.
Exposure to absolute maximum rating conditions for extended periods may affect device
reliability. Maximum ratings are absolute ratings; exceeding only one of these values may
cause irreversible damage to the integrated circuit.
Table 2-1 Maximum Ratings at TA= 25 °C, unless otherwise specified
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Enable voltage
BCR 320U E6327
BCR 321U E6327
VEN
-
-
-
-
25
4.5
V
Output current Iout --300mA
Output voltage Vout --16V
Reverse voltage between all terminals VR--0.5V
Total power dissipation Ptot - - 1000 mW TS≤100 °C
Junction temperature TJ--150°C
Storage temperature range TSTG -65 - 150 °C
Table 2-2 Thermal Resistance at TA= 25 °C, unless otherwise specified
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Junction - soldering point1)
1) For calculation of RthJA please refer to Application Note AN077 (Thermal Resistance Calculation)
RthJS --50K/W
Table 2-3 Electrical Characteristics at TA= 25 °C, unless otherwise specified
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Collector-emitter breakdown voltage VBR(CEO) 16 - - V IC=1mA, IB=0
Enable current
BCR 320U E6327
BCR 321U E6327
IEN
-
-
1.2
1.2
-
-
mA VEN =12V
VEN =3.3V
DC current gain hFE 200 350 500 - IC=50mA, VCE =1V
Internal resistor Rint 85 95 105 ΩIRint =10mA
Bias resistor
BCR 320U E6327
BCR 321U E6327
RB
-
-
10
1.5
-
-
kΩ
BCR 320U E6327 / BCR 321U E6327
Electrical Characteristics
Datasheet 10 Revision 2.1, 2015-01-28
Output current
BCR 320U E6327
BCR 321U E6327
Output current at Rext =3Ω
BCR 320U E6327
BCR 321U E6327
Iout
9
9
-
-
10
10
250
250
11
11
-
-
mA Vout =1.4V
VEN =12V
VEN =3.3V
Vout >1.4V
VEN =12V
VEN =3.3V
Voltage drop (VRext)Vdrop 0.85 0.95 1.05 V Iout =10mA
Table 2-4 DC Characteristics with stabilized LED load at TA= 25 °C, unless otherwise specified
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Lowest sufficient supply voltage overhead VSmin -1.4-VIout >18mA
Output current change versusTA
BCR 320U E6327
BCR 321U E6327
∆Iout/Iout
-
-
-0.2
-0.2
-
-
%/K Vout >2.0V
VEN =12V
VEN =3.3V
Output current change versus VS
BCR 320U E6327
BCR 321U E6327
∆Iout/Iout
-
-
1
1
-
-
%/V Vout >2.0V
VEN =12V
VEN =3.3V
Table 2-3 Electrical Characteristics at TA= 25 °C, unless otherwise specified (cont’d)
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 11 Revision 2.1, 2015-01-28
3 Typical characteristics
Figure 3-1 Total Power Dissipation Ptot = f(TS)
Figure 3-2 Permissible Pulse Load RthJS = f(tp)
0
200
400
600
800
1000
1200
0 20 40 60 80 100 120 140
Ptot [mW]
TS [°C]
0.1
1
10
100
10-6 10-5 10-4 10-3 10-2 10-1 100
RthJS [K/W]
tp [s]
D = 0
D = 0.005
D = 0.01
D = 0.02
D = 0.05
D = 0.1
D = 0.2
D = 0.5
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 12 Revision 2.1, 2015-01-28
Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp)
1
10
100
1000
10-6 10-5 10-4 10-3 10-2 10-1 100
Ptotmax / PtotDC
tp [s]
D = 0
D = 0.005
D = 0.01
D = 0.02
D = 0.05
D = 0.1
D = 0.2
D = 0.5
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 13 Revision 2.1, 2015-01-28
Figure 3-4 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = Parameter
Figure 3-5 BCR 320U: Output Current versus Rext Iout = f(Rext), VEN = 12 V, Vout = Parameter
0
0.1
0.2
0.3
0 1 2 3 4 5 6 7 8 9 10 11 12
Iout [A]
Vout [V]
Rext = open
Rext = 20 Ω
Rext = 10 Ω
Rext = 6 Ω
Rext = 4 Ω
Rext = 3 Ω
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
1 10 100
Iout [A]
Rext [Ω]
Vout = 1.4 V
Vout = 5.4 V
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 14 Revision 2.1, 2015-01-28
Figure 3-6 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = open, TA = Parameter
Figure 3-7 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = 20 Ω, TA = Parameter
0
0.005
0.01
0.015
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
0
0.01
0.02
0.03
0.04
0.05
0.06
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 15 Revision 2.1, 2015-01-28
Figure 3-8 BCR 320U: Output Current versus Vout Iout = f(Vout), VEN = 12 V, Rext = 3 Ω, TA = Parameter
Figure 3-9 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter
0
0.1
0.2
0.3
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
0
0.005
0.01
0.015
0 5 10 15 20 25
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 16 Revision 2.1, 2015-01-28
Figure 3-10 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter
Figure 3-11 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 3 Ω, TA = Parameter
0
0.01
0.02
0.03
0.04
0.05
0.06
0 5 10 15 20 25
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
0
0.1
0.2
0.3
0 5 10 15 20 25
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 17 Revision 2.1, 2015-01-28
Figure 3-12 BCR 320U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter
Figure 3-13 BCR 320U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter
0
0.1
0.2
0.3
0 5 10 15 20 25
Iout [A]
VEN [V]
Rext = open
Rext = 20 Ω
Rext = 10 Ω
Rext = 6 Ω
Rext = 4 Ω
Rext = 3 Ω
0
0.5
1
1.5
2
2.5
3
0 5 10 15 20 25
IEN [mA]
VEN [V]
-40 °C
25 °C
80 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 18 Revision 2.1, 2015-01-28
Figure 3-14 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = Parameter
Figure 3-15 BCR 321U: Output Current versus Rext Iout = f(Rext), VEN = 3.3 V, Vout = Parameter
0
0.1
0.2
0.3
0 1 2 3 4 5 6 7 8 9 10 11 12
Iout [A]
Vout [V]
Rext = open
Rext = 20 Ω
Rext = 10 Ω
Rext = 6 Ω
Rext = 4 Ω
Rext = 3 Ω
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
1 10 100
Iout [A]
Rext [Ω]
Vout = 1.4 V
Vout = 5.4 V
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 19 Revision 2.1, 2015-01-28
Figure 3-16 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = open, TA = Parameter
Figure 3-17 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 20 Ω, TA = Parameter
0
0.005
0.01
0.015
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
0
0.01
0.02
0.03
0.04
0.05
0.06
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 20 Revision 2.1, 2015-01-28
Figure 3-18 BCR 321U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 3 Ω, TA = Parameter
Figure 3-19 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter
0
0.1
0.2
0.3
0 2 4 6 8 10 12
Iout [A]
Vout [V]
-40 °C
25 °C
85 °C
0
0.005
0.01
0.015
0 1 2 3 4 5
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 21 Revision 2.1, 2015-01-28
Figure 3-20 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter
Figure 3-21 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 3 Ω, TA = Parameter
0
0.01
0.02
0.03
0.04
0.05
0.06
0 1 2 3 4 5
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
0
0.1
0.2
0.3
0 1 2 3 4 5
Iout [A]
VEN [V]
-40 °C
25 °C
85 °C
BCR 320U E6327 / BCR 321U E6327
Typical characteristics
Datasheet 22 Revision 2.1, 2015-01-28
Figure 3-22 BCR 321U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter
Figure 3-23 BCR 321U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter
0
0.1
0.2
0.3
0 1 2 3 4 5 6
Iout [A]
VEN [V]
Rext = open
Rext = 20 Ω
Rext = 10 Ω
Rext = 6 Ω
Rext = 4 Ω
Rext = 3 Ω
0
1
2
3
4
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
IEN [mA]
VEN [V]
-40 °C
25 °C
80 °C
BCR 320U E6327 / BCR 321U E6327
Application hints
Datasheet 23 Revision 2.1, 2015-01-28
4 Application hints
Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller
Figure 4-2 Application Circuit: Enabling by Connecting to VS
Application hints
BCR 320U E6327 / BCR 321U E6327 serve as an easy to use constant current sources for LEDs. In stand alone
application an external resistor can be connected to adjust the current from 10 mA to 250 mA. Rext can be
determined by using Figure 3-5 or Figure 3-15. Connecting a low tolerance resistor Rext will improve the overall
accuracy of the current sense resistance formed by the parallel connection of Rint and Rext leading to an improved
current accuracy. Please take into account that the resulting output currents will be slightly lower due to the self
heating of the component and the negative thermal coefficient.
Please visit our web site www.infineon.com/lowcostleddriver for application notes and for up-to-date
application information.
EN OUT
R
ext
GND
+V
S
2,3,51
I
out
I
EN
BCR 321 U E6327
µC
V
drop
6
4
R
ext
(optional )
EN OUT
R
ext
GND
+V
S
V
drop
2,3 ,51
6
4
I
out
I
EN
BCR 320 U E 6327
R
ext
(optional )
BCR 320U E6327 / BCR 321U E6327
Package
Datasheet 24 Revision 2.1, 2015-01-28
5 Package
Figure 5-1 Package Outline for SC74 (dimensions in mm)
Figure 5-2 Package Footprint for SC74 (dimensions in mm)
Figure 5-3 Tape and Reel Information for SC74 (dimens ions in mm)
SC74-PO V0
4
546
321
1.1 MAX.
(0.35)
(2.25)
±0.2
2.9 B
0.2
+0.1
-0.05
0.35
Pin 1
marking
M
B6x
0.95
1.9
0.15
-0.06
+0.1
1.6
A
±0.1
2.5
0.25
±0.1
±0.1
A0.2
M
0.1 MAX.
0.5
0.95
1.9
2.9
SC74-FPR
V0
4
SC74-T
P
2.7
4
3.15
Pin 1
marking
8
0.2
1.15
BCR 320U E6327 / BCR 321U E6327
Terminology
Datasheet 25 Revision 2.1, 2015-01-28
Terminology
∆Iout/Iout Output current change
hFE DC current gain
IEN Enable current
Iout Output current
IRReverse current
LED Light Emitting Diode
PCB Printed Circuit Board
Ptot Total power dissipation
PWM Pulse Width Modulation
RBBias resistor
Rext External resistor
Rint Internal resistor
RoHs Restriction of Hazardous Substance directive
RthJS Thermal resistance junction to soldering point
TAAmbient temperature
TJJunction temperature
TSSoldering point temperature
Tstg Storage temperature
VBR(CEO) Collector-emitter breakdown voltage
VBR Breakdown voltage
Vdrop Voltage drop
VEN Enable voltage
Vout Output voltage
VRReverse voltage
VSSupply voltage
VSmin Lowest sufficient supply voltage overhead
