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DC/DC Converters
TSRN-1SM Series, 1 A Switching Regulator
Features
◆ Compact SMD package
◆ Suitable for positive & negative output circuit
◆ Adjustable output voltage
◆ Wide input up to 42 VDC
◆ Remote On/Off input
◆ Built in filter capacitors
◆ Operation temp. range –40°C to +85°C
◆ No heat-sink required
◆ Over-temperature protection
◆ Short circuit protection
◆ Excellent line / load regulation
◆ Low standby current
◆ Moisture sensitivity level (MSL) 1
◆ Qualified for leadfree reflow solder
process
◆ 3-year product warranty
The new TSRN-1SM series are step-down non–isolated switching regulators in com-
pact SMD package. They are an ideal solution to replace inefficient linear regula-
tors. The high efficiency up to 95 % allows full load operation up to +55°C (+85°C
with derating) ambient temperature without the need of forced aircooling.
The TSRN-1SN switching regulators provide other significant features over linear
regulators, i.e. better output accuracy (±2 %), lower standby current of ~4 mA and
no requirement of external capacitors. They are suitable for positive or negative
output circuits and offer a trim input for output voltage adjustment. The high ef-
ficiency, low standby power consumption and remote On/Off function make these
regulators an ideal solution for energy sensitive applications.
Order code 1) Input voltage Output voltage Output current Efficiency typ.
range 2) / (nominal) nominal trim range 3) max. @ Vin min. @
Vin max.
Positive output circuit
TSRN 1-0525SM 3.0 – 5.5 VDC (5 VDC) 2.5 VDC 1.2 – 3.6 VDC 95.5 % 95 %
TSRN 1-2433SM 4.6 – 42 VDC (12 VDC ) 3.3 VDC 1.5 – 5.5 VDC 87. 5 % 80 %
TSRN 1-2450SM 6.5 – 42 VDC (12 VDC ) 5.0 VDC 2.5 – 8.0 VDC 91.5 % 83.5 %
TSRN 1-2490SM 10.5 – 42 VDC (12 VDC ) 9.0 V DC 4.5 – 12.6 VDC 1.0 A 94.5 % 89 %
TSRN 1-24120SM 13.5 – 42 VDC (24 VDC) 12 VDC 4.5 – 13.5 VDC 95.0 % 91 %
TSRN 1-24150SM 16.5 – 42 VDC (24 VDC) 15 VDC 4.5 – 15.5 VDC 95.5 % 92.5 %
Negative output circuit
TSRN 1-2433SM 4.6 – 32 VDC (12 VDC ) -3.3 VDC -1.5 – -5.5 VDC 0.6 A 74 % 77 %
TSRN 1-2450SM 4.6 – 31 VDC (12 VDC ) -5.0 VDC -2.5 – -8.0 VDC 0.4 A 80 % 78 %
TSRN 1-2490SM 7 – 27 VDC (12 VD C) -9.0 VDC -4.5 – -12.6 VDC 0.3 A 85 % 82 %
TSRN 1-24120SM 7 – 24 VDC (12 VD C ) -12 VDC -4.5 – -13.5 VDC 0.3 A 84 % 86 %
TSRN 1-24150SM 7 – 21 VDC (12 VD C ) -15 VDC -4.5 – -15.5 VDC 0.2 A 85 % 84 %
Models
1) Same order code for positive and negative output operation, see page 3 for circuits.
2) For input voltage higher 36 VDC an input capacitor 22 µF/ 50 V is required.
3) For positive output circuit, input voltage must be higher than output voltage set: >0.5 V for TSRN1-0525SM and >1.5 V for other models.
For negative output circuit, input voltage plus absolute output voltage set must not exceed 36 VDC (Vin + |Vout| < 36 VDC)
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Input Specifications
No load input current – positive output circuit TSRN 1-0525SM: 6 mA typ.
TSRN 1-2433SM: 1.5 mA typ.
other models: 4 mA typ.
– negative output circuit -3.3 / -5.5 Vout models: 3 mA typ.
-9.0 / -12 Vout models: 7 mA typ.
TSRN 1-24150SM: 10 mA typ.
Reflected ripple current 100 mA typ.
Input filter internal capacitors
Output Specifications
Voltage set accuracy ±2 % (at full load)
Regulation – Input variation 0.2 %
– Load variation 0 – 100 % 0.6 %
– Load variation 10 – 90 % 0.3 %
Startup voltage overshoot 1.0 % max.
Minimum load not required
Ripple and noise – |Vout| = 1.2V – 8V 50 mVpk-pk max.
(20 MHz Bandwidth) – |Vout| = 8.1V – 15V 75 mVpk-pk max.
Temperature coefficient ±0.015 % / °C max.
Dynamic load response (change of 50% to 100% load) 150 mV max. peak variation
250 µS max. response time
Startup time – start up time at nominal Vin, constant resistive load 5 mS typ.
Short circuit protection continuous, automatic recovery
Current limitation TSRN 1-0525SM: at 4.0 A typ.
other models: at 2.0 A typ.
Capacitive load 470 µF max.
General Specifications
Temperature ranges – Operating –40°C to +85°C
– case temperature +130°C. max.
– Storage –55°C to +125°C
Derating – positive output circuit 1.7 %/K above +55°C
– negative output circiut 2.5 %/K above +65°C
Thermal shock, mechanical shock & vibration EN 61373, MIL-STD-810F
– Test conditions www.tracopower.com/products/mil810.pdf
Overtemperature protection at +170°C (on internal IC)
Humidity (non condensing) 90 % rel H max.
Reliability, calculated MTBF (MIL-HDBK-217F, at +25°C, ground benign) >4´500’000 h
Isolation voltage none
Switching frequency TSRN 1-0525SM: 410 kHz typ.
TSRN 1-2433SM: 300 kHz typ.
other models: 580 kHz typ.
Safety standards (designed to meet) UL/cUL 60950-1, IEC/EN 60950-1
Remote On/Off – Control pin referance for positive output circuit GND
– Control pin referance for negative output circuit -Vout
– On: 2 – 5 VDC or open circuit.
– Off: 0 – 0.8 VDC or short circuit
– Off idle current: 1.2 mA typ.
Environmental compliance – Reach www.tracopower.com/products/tsrn1sm-reach.pdf
– RoHS RoHS directive 2011/65/EU
DC/DC Converters
TSRN-1SM Series 1 A
All specifications valid at nominal input voltage, full load and +25°C after warm-up time unless otherwise stated.
Page 2 of 4
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Physical Specifications
Casing material non-conductive plastic (UL94V-0 rated)
Potting material epoxy, (UL 94V-0 rated)
Weight 1.7 g (0.06 oz)
Lead-free reflow solder process as per J-STD-020D.01 (to find at:
www.jedec.org - free registration rqueired)
– max. peak body temperature 245°C
Moisture sensitivity level (MSL) level 1 as per IPC J-STD-033B.1 (to find at:
www.jedec.org - free registration required)
Washing baking after washing: 100°C for 30 min.
Packaging
www.tracopower.com/products/tsrn1sm-pack.pdf
DC/DC Converters
TSRN-1SM Series 1 A
Applications notes
Positive output operation:
Negative output operation (not for model TSRN 1-0525SM):
C1 = 10 µF / 50 V, 1210 X5R MLCC
C2 = 10 µF / 25 V, 1206 X5R MLCC
Output voltage adjustment:
15
7,9
TSRN 1SM
+Vin
GND
+Vout
GND
10
Remote On/O
C1
C1
15
7,9
+Vin
TSRN 1SM C2
GND
-Vout
GND
10
Remote On/O
7, 9
RU
6
Trim Up
6
RD
5
Trim Down
Model RU [KOhm] RD [KOhm]
TSRN 1-0525SM 40.75 / (Vo – 2.5) (Vo . 50.75 – 40.75) / (2.5 – Vo)
TSRN 1-2433SM 26.4 / (Vo – 3.3) (Vo . 33 – 26.4) / (3.3 – Vo)
TSRN 1-2450SM 160 / (Vo – 5) (Vo . 200 – 160) / (5 – Vo)
TSRN 1-2490SM 80 / (Vo – 9) (Vo . 100 – 80) / (9 – Vo)
TSRN 1-24120SM 240 / (Vo – 12) (Vo . 300 – 240) / (12 – Vo)
TSRN 1-24150SM 240 / (Vo – 15) (Vo . 300 – 240) / (15 – Vo)
Vo = output voltage to be adjusted.
Calculate with absolute values for negative output circuit
Open Trim = nominal output voltage
(Open Remote On/Off input = On)
(Open Remote On/Off input = On)
C1 = 22 µF/ 50 V (required only if input
voltage is higher than 36 V)
Jenatschstrasse 1 · CH-8002 Zurich · Switzerland
Tel. +41 43 311 45 11 · Fax +41 43 311 45 45 · info@traco.ch · www.tracopower.com
Outline Dimensions
DC/DC Converters
TSRN-1SM Series 1 A
Rev. 01/13
Specifications can be changed any time without notice.
Pin pos. neg.
1+Vin +Vin
5+Vout GND
6Trim
7GND -Vout
9GND -Vout
10 Remote On/Off
Pin-Out
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Dimensions in [mm], () = Inch
Pin pitch tolerances: ±0.25 (±0.01)
Pin profile tolerance: ±0.1 (±0.004)
Other tolerances: ±0.5 (±0.02)
top view
15
67910
9.3(0.37)
11.82 (0.47)
2.54 10.16
(0.10)
(0.40)
2.54 2.545.08
(0.10) (0.10)(0.20)
15.2 (0.60)
0.30 (0.01)
7.3(0.29)
0.5 (0.02)
(0.51)
9.7
(0.38)
15
67
9
10
9.3
(0.37)
10.16
(0.40)
2.54
(0.10)
1.5 5.08
(0.20)(0.006)
12.92
Solder Pad Dimension
