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DC/DC Converters
TSR-1 Series, 1 A
Features
◆ Up to 96 % efficiency
– No heat-sink required
◆ Pin compatible with LMxx linear regulators
◆ SIP-package fits existing TO-220 footprint
◆ Built in filter capacitors
◆ Operation temp. range –40°C to +85°C
◆ Short circuit protection
◆ Wide input operating range
◆ Excellent line / load regulation
◆ Low standby current
◆ 3-year product warranty
The new TSR-1 series step-down switching regulators are drop-in replacement for
inefficient 78xx linear regulators. A high efficiency up to 96 % allows full load
operation up to +60°C ambient temperature without the need of any heat-sink or
forced cooling.
The TSR-1 switching regulators provide other significant features over linear regu-
lators, i.e. better output accuracy (±2 %), lower standby current of 2 mA and no
requirement of external capacitors. The high efficiency and low standby power
consumption makes these regulators an ideal solution for many battery powered
applications.
Order code Input voltage range Output voltage Output current Efficiency typ.
max. @ Vin min. @
Vin max.
TSR 1-2412 4.6 – 36 VDC* 1.2 VDC 74 % 62 %
TSR 1-2415 4.6 – 36 VDC* 1.5 VDC 78 % 65 %
TSR 1-2418 4.6 – 36 VDC* 1.8 VDC 82 % 69 %
TSR 1-2425 4.6 – 36 VDC* 2.5 VDC 87 % 75 %
TSR 1-2433 4.75 – 36 VDC* 3.3 VDC 1.0 A 91 % 78 %
TSR 1-2450 6.5 – 36 VDC* 5.0 VDC 94 % 84 %
TSR 1-2465 9.0 – 36 VDC* 6.5 VDC 93 % 87 %
TSR 1-2490 12 – 36 VDC* 9.0 V DC 95 % 90 %
TSR 1-24120 15 – 36 VDC* 12 VDC 95 % 92 %
TSR 1-24150 18 – 36 VDC* 15 VDC 96 % 94 %
Models
* For input voltage higher than 32 VDC an input capcitor 22 µF / 50 V is required. See application notes (page 3)
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Input Specifications
Maximum input current (at Vin min. and 1 A output current) 1 A
No load input current 1 mA typ.
Reflected ripple current 150 mA
Input filter internal capacitors, see application notes for to
meet EN55022 class A
Output Specifications
Voltage set accuracy ±2 % (at full load)
Regulation – Input variation 0.2 %
– Load variation (10 – 100 %) 1.2 & 1.5 VDC models: 0.6 %
other models: 0.4 %
Overshoot startup voltage 1.0 % max.
Minimum load not required
Ripple and noise (20 MHz Bandwidth) 1.2 – 6.5 VDC models: 50 mV max.
9 – 15 VDC models: 75 mV max.
Temperature coefficient ±0.015 % / °C max.
Dynamic load response 50% load change (upper half) 150 mV max. peak variation
250 µS max. response time
Startup rise time 10 % to 90 % Vout 2 mS
Short circuit protection continuous, automatic recovery
Current limitation at 2.5 A typ.
Capacitive load 470 µF max.
General Specifications
Temperature ranges – Operating –40°C to +85°C (–40°F to +185°F)
– Storage –55°C to +125°C (–67°F to +257°F)
Derating 2.4 %/K above 60°C
Thermal shock acc. MIL-STD-810F
Humidity (non condensing) 95 % rel H max.
Reliability, calculated MTBF (MIL-HDBK-217F, at +25°C, ground benign) >5’350’000 h
Isolation voltage none
Switching frequency 500 kHz ±10 % (pulse width modulation)
Physical Specifications
Casing material non-conductive plastic
Potting material silicon (flammability to UL 94V-0 rated)
Package weight 1.9 g (0.07 oz)
Soldering profile max. 265°C / 10 sec. (wave soldering)
DC/DC Converters
TSR-1 Series 1 A
All specifications valid at nominal input voltage, full load and +25°C after warm-up time unless otherwise stated.
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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
TSR-1 Series 1 A
Rev. 05/12
Specifications can be changed any time without notice.
1+Vin
2GND
3+Vout
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)
0.5 (0.02)
10.2 (0.40)
4.1
(0.16)
2.54
0.5
2.54
(0.1) (0.1)
(0.02)
11.7 (0.46)
2.0 (0.08)
7.6 (0.30)
Bottom view
123
0.3
(0.01)
3.3
(0.13)
Applications notes
For input voltage higher than 32 VDC (max. 36 VDC)
Load
C1
+Vin +Vout
GND
Input TSR 1
Input filter to meet EN 55022 class A
Load
C1
+Vin +Vout
GND
Input TSR 1
C2
L1
C1 = 22 µF / 50 V
C1 = 4.7 µF / 50 V
C2 = 4.7 µF / 50 V
L1 = 8.2 µH / 1.5 A / 0.08 Ohm
