Non-Isolated DC/DC Converter (POL) TSRN 1SM Series, 1 A Compact SMD package Suitable for positive & negative output circuit Adjustable output voltage Wide input up to 42 VDC Remote On/Off input The new TSRN 1SM series are step-down nonisolated switching regulators in compact SMD package. They are an ideal solution to replace inefficient linear Built in filter capacitors regulators. The high efficiency up to 95% allows full load operation up to Operation temp. range 40C to +85C +55C (+85C with derating) ambient temperature without the need of forced air cooling. Excellent line/load regulation The TSRN-1SM switching regulators provide other significant features over lin- Low standby current ear 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 3-year product warranty negative output circuits and offer a trim input for output voltage adjustment. The high efficiency, low standby power consumption and remote On/Off func- tion make these regulators an ideal solution for energy sensitive applications. Models Order Code Output Current Input Voltage Output Voltage Efficiency max. Range nom. (adjustable) typ. TSRN 1-0525SM 3 - 5.5 VDC (5 VDC nom.) 2.5 VDC (1.2 - 3.63 VDC) 96 % TSRN 1-2433SM 4.6 - 42 VDC (12 VDC nom.) 3.3 VDC (1.5 - 5.5 VDC) 88 % TSRN 1-2450SM 6.5 - 42 VDC (12 VDC nom.) 5 VDC (2.5 - 8.0 VDC) 92 % 1 000 mA TSRN 1-2490SM 10.5 - 42 VDC (12 VDC nom.) 9 VDC (4.5 - 12.6 VDC) 95 % TSRN 1-24120SM 13.5 - 42 VDC (24 VDC nom.) 12 VDC (4.5 - 13.5 VDC) 95 % TSRN 1-24150SM 16.5 - 42 VDC (24 VDC nom.) 15 VDC (4.5 - 15.5 VDC) 96 % Note - For external circuit proposal for negative output voltage, refer to application note: www.tracopower.com/overview/tsrn1sm Page 1 / 4 www.tracopower.com December 14, 2021TSRN 1SM Series, 1 A Input Specifications Input Current - At no load 5 Vin models: 6 mA typ. 12 Vin models: 3 mA typ. 24 Vin models: 4 mA typ. Reflected Ripple Current 100 mAp-p typ. Recommended Input Fuse 5 Vin models: 2 000 mA (slow blow) 12 Vin models: 2 500 mA (slow blow) 24 Vin models: 1 600 mA (slow blow) (The need of an external fuse has to be assessed in the final application.) Input Filter Internal Capacitor Output Specifications Output Voltage Adjustment 2.5 Vout models: 1.2 - 3.63 VDC 3.3 Vout models: 1.5 - 5.5 VDC 5 Vout models: 2.5 - 8.0 VDC 9 Vout models: 4.5 - 12.6 VDC 12 Vout models: 4.5 - 13.5 VDC 15 Vout models: 4.5 - 15.5 VDC (By external trim resistor) www.tracopower.com/overview/tsrn1sm See application note: Voltage Set Accuracy 2% max. Regulation - Input Variation (Vmin - Vmax) 0.2% max. - Load Variation (0 - 100%) 0.6% max. Ripple and Noise 5 Vin models: 50 mVp-p max. (20 MHz Bandwidth) 24 Vin models: 75 mVp-p max. 3.3 Vout models: 50 mVp-p max. 5 Vout models: 50 mVp-p max. 9 Vout models: 75 mVp-p max. Capacitive Load 470 F max. Minimum Load Not required Temperature Coefficient 0.015 %/K max. Start-up Time 5 ms typ. Short Circuit Protection Continuous, Automatic recovery Transient Response - Peak Variation 150 mV typ. / 250 mV max. (50% Load Step) - Response Time 250 s typ. / 350 s max. (50% Load Step) General Specifications Relative Humidity 95% max. (non condensing) Temperature Ranges - Operating Temperature 40C to +85C - Case Temperature +105C max. - Storage Temperature 55C to +125C Power Derating - High Temperature See application note: www.tracopower.com/overview/tsrn1sm Over Temperature - Protection Mode 170C typ. (Automatic recovery) Protection Switch Off - Measurement Point Internal IC temperature Cooling System Natural convection (20 LFM) Remote Control - Voltage Controlled Remote On: 2.0 to 5.0 VDC or open circuit Off: 0 to 0.8 VDC or short circuit Refers to Remote and GND Pin - Off Idle Input Current 1.2 mA typ. Switching Frequency 410 kHz typ. (PWM) (2.5 Vout models) 300 kHz typ. (PWM) (3.3 Vout models) 580 kHz typ. (PWM) (other models)) Insulation System Non-isolated Reliability - Calculated MTBF 14 000 000 h (MIL-HDBK-217F, ground benign) All specifications valid at nominal voltage, resistive full load and +25C after warm-up time, unless otherwise stated. Page 2 / 4 www.tracopower.com December 14, 2021