KA3525A - ON SEMICONDUCTOR

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Is Now Part of

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of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right

to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and speciﬁcally disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON

Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON

Semiconductor data sheets and/or speciﬁcations can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s

technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA

Class 3 medical devices or medical devices with a same or similar classiﬁcation in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended

or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its ofﬁcers, employees, subsidiaries, afﬁliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out

of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor

is an Equal Opportunity/Afﬁrmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

www.fairchildsemi.com

Rev. 1.0.1

Features

•5V ±1% Reference

• Oscillator Sync Terminal

• Internal Soft Start

• Deadtime Control

• Und e r Voltage Lo ck out

Description

The KA3525A is a monolithic integrated circuit that

includes all of the control circuits necessary for a pulse width

modulating regulator. There are a voltage reference, an error

amplifier , a pulse width modulator, an oscillator, an under

voltage lockout, a soft start circuit, and the output driver in

the chip.

16-DIP

Internal Block Diagram

10 5

364

U.V.L.O.

BAND GAP

REF 5V

LATCH

F/F Q

OUTPUT A

OUTPUT B

OSCILLATOR

DISCHARGE

ERR

AMP

PWM

COMP

VREF

VCC

GND

EA(-)

EA(+)

EAOUT

(SOFT

START)

SHUT DOWN

SYNC RTOSC

OUTPUT

KA3525A

SMPS Controller

KA3525A

Absolute Maximum Ratings

Electrical Characteristics

(VCC = 20V, TA = 0 to +70°C, unless otherwise specified)

Parameter Symbol Value Unit

Supply Voltage VCC 40 V

Collector Supply Voltage VC40 V

Output Current, Sink or Source IO500 mA

Reference Output Current IREF 50 mA

Oscillator Charging Current ICHG(OSC) 5mA

Power Dissipation (TA = 25°C) PD1000 m/W

Operating Temperature TOPR 0 ~ +70 °C

Storage Temperature TSTG -65 ~ +150 °C

Lead Temperature (Soldering, 10sec) TLEAD +300 °C

Parameter Symbol Conditions Min. Typ. Max. Unit

REFERENCE SECTION

Reference Output Voltage VREF TJ = 25°C5.05.15.2V

Line Regulation ∆VREF VCC = 8 to 35V - 9 20 mV

Load Regulation ∆VREF IREF = 0 to 20mA - 20 50 mV

Short Circuit Output Current ISC VREF = 0, TJ = 25°C - 80 100 mA

Total Output Variation (Note1) ∆VREF Line, Load and Temperature 4.95 - 5.25 V

Temperature Stability (Note1) STT--2050mV

Long Term Stability (Note1) ST TJ = 125°C ,1KHRS-2050mV

OSCILLATOR SECTION

Initial Accuracy (Note1, 2) ACCUR TJ = 25°C-±3±6%

Frequency Change With Voltage ∆f/∆VCC VCC = 8 to 35V (Note1, 2) - ±0.8 ±2%

Maximum Frequency f(MAX) RT = 2kΩ, CT = 470pF 400 430 - kHz

Minimum Frequency f(MIN) RT = 200kΩ, CT = 0.1uF - 60 120 Hz

Clock Amplitude (Note1, 2) V(CLK) -34-V

Clock Width (Note1, 2) tW(CLK) TJ = 25°C0.30.61µs

Sync Threshold VTH(SYNC) -1.2 2 2.8 V

Sync Input Current II(SYNC) Sync = 3.5V - 1.3 2.5 mA

KA3525A

Electrical Characteristics (Continued)

(VCC = 20V, TA = 0 to +70°C, unless otherwise specified)

Note :

1. These parameters . although guaranteed over the recommended operating conditions, are not 100% tested in production

2. Te sted at fOSC=40kHz (RT =3.6K, CT =0.01uF, RI = 0Ω)

Parameter Symbol Conditions Min. Typ. Max. Unit

ERROR AMPLIFIER SECTION (VCM = 5.1V)

Input Offset Voltage VIO --1.510mV

Input Bias Current IBIAS --110µA

Input Offset Current IIO --0.11µA

Open Loop Voltage Gain GVO RL ≥ 10MΩ60 80 - dB

Common Mode Rejection Ratio CMRR VCM = 1.5 to 5.2V 60 90 - dB

Power Supply Rejection Ratio PSRR VCC = 8 to 3.5V 50 60 - dB

PWM COMPARATOR SECTION

Minimum Duty Cycle D(MIN) ---0%

Maximum Duty Cycle D(MAX) -45 49 - %

Input Threshold Voltage (Note2) VTH1 Zero Duty Cycle 0.7 0.9 - V

Input Threshold Voltage (Note2) VTH2 Max Duty Cycle - 3.2 3.6 V

SOFT-START SECTION

Soft Start Current ISOFT VSD = 0V, VSS = 0V 25 51 80 µA

Soft Start Low Level Voltage VSL VSD = 25V - 0.3 0.7 V

Shutdown Threshold Voltage VTH(SD) -0.9 1.3 1.7 V

Shutdown Input Current IN(SD) VSD = 2.5V - 0.3 1 mA

OUTPUT SECTION

Low Output Voltage I VOL I ISINK = 20mA - 0.1 0.4 V

Low Output Voltage II VOL II ISINK = 100mA - 0.05 2 V

High Output Voltage I VCH I ISOURCE = 20mA 18 19 - V

High Output Voltage II VCH II ISOURCE = 100mA 17 18 - V

Under Voltage Lockout VUV V8 and V9 = High 678V

Collector Leakage Current ILKG VCC = 35V - 8 0 200 µA

Rise Time (Note1) tRCL = 1uF, TJ = 25°C - 80 600 ns

Fall Time (Note1) tFCL = 1uF, TJ = 25°C - 70 300 ns

STANDBY CURRENT

Supply Current ICC VCC = 35V - 12 20 mA

KA3525A

Test Circuit

BAND GAP

REF 5V U.V.L.O.

0.1

Vcc 0.1

RWM

ADJ

10k

1.5K

10K

0.01

5.0uF

5.0k

5.0k 5.0k

100

F/F

ERR

AMP ERR

AMP

OSCILLATOR

LATCH

SS R

SOFT START +

SHUTDOWN

VREF

RAMP

0.009 0.1

3.6k

0.001

DEAD

TIME

OUT B

10k

OUT A

CLOCK

KA3525A

Mechanical Dimensions

Package

#8 #9

#16

6.40

±0.20

7.62

0.300

2.54

0.100

0.252

±0.008

0~15°

0.25

+0.10

–0.05

0.010

+0.004

–0.002

3.30

±0.30

0.130

±0.012

3.25

±0.20

0.128

±0.008

19.40

±0.20

0.764

±0.008

19.80

0.780 MAX

5.08

0.200

0.38

0.014

MAX

MIN

0.81

0.032

()

0.46

±0.10

0.018

±0.004

0.059

±0.004

1.50

±0.10

16-DIP

KA3525A

10/2/02 0.0m 001

Stock#DSxxxxxxxx

 2002 Fairchild Semiconductor Corporation

LIFE SU PP ORT POLICY

FAIRCHILD’S PRODUCTS AR E NOT AUTHORIZED FOR USE AS CRITICAL COMP ONENTS IN L IFE SUPPOR T DEVICES

OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR

CORPORA TION. As used herein:

1. Life support devices or systems are devices or systems

which, (a ) are intended for surgical im plant into the body,

or (b) support or sustain life, and (c) whose failure to

perform when properly used in accordance with

instructions for use provided in the labeling, can be

reasonab ly expected to result in a significant injury of the

user.

2. A critical component in any component of a life support

device or system whose failure to perfo rm can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effec tiveness.

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DISCLAIMER

FAIRCHILD SEMI CONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY

PRO DUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DO ES NOT ASSUME ANY

LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER

DOES IT CONVEY A NY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OT HERS.

Ordering Information

Product Number Package Operating Temperature

KA3525A 16-DIP 0 ~ +70°C

www.onsemi.com

ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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