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STCS2ASPR

2A constant current LED driver, 4.5V-40V input, PWM dimming, slope control, diagnostic, PowerSO-10

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Manufacturer Part：

STCS2ASPR

Package：

PowerSO-10 (7.6 x 9.5 x 3.65 mm)

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Description

Product Overview

The STCS2ASPR from STMicroelectronics is a BiCMOS constant current LED driver capable of delivering up to 2A output current with +-10% precision. It features PWM dimming, slope control for EMI reduction, LED disconnection diagnostic, and operates from 4.5V to 40V input, in a PowerSO-10 surface-mount package.

Key Specifications

Manufacturer STMicroelectronics
Output Current Up to 2A
Input Voltage Range 4.5V to 40V
Feedback Voltage 100mV (90-110mV)
Current Precision +-10%
Dropout Voltage 0.58V typ @ 2A
Quiescent Current 450uA typ (on mode)
Shutdown Current 1uA (5-12V)
Dimming PWM (up to 50kHz)
Package PowerSO-10
Operating Temperature -40C to +125C

Features

  • Up to 2A constant current output
  • Wide input voltage: 4.5V to 40V
  • Current set by external sensing resistor (100mV feedback)
  • PWM dimming input (few Hz to 50kHz)
  • Slope control with external capacitor for EMI reduction
  • LED disconnection diagnostic output (open-drain)
  • Shutdown pin for power conservation
  • Less than 0.5V voltage overhead
  • Internal thermal shutdown at 155C with 25C hysteresis

Applications

  • Low-voltage LED lighting (5V, 12V, 24V)
  • Automotive LED lighting and signage
  • General illumination and display backlighting
  • RGB LED driving
  • Constant current source for industrial applications

The STMicroelectronics STCS2ASPR is a BiCMOS constant current source designed to provide precise constant current for driving LEDs from a varying input voltage source. It replaces discrete component solutions for driving LEDs in low-voltage applications such as 5V, 12V, or 24V systems, offering benefits in precision, integration, and reliability. The output current is set via an external sensing resistor connected to the FB pin, with a 100mV feedback voltage allowing low-value resistors to minimize power dissipation. A dedicated PWM input enables dimming control from a few Hz to 50kHz. An external capacitor on the SLOPE pin controls the current rise time, reducing EMI during switching transitions. The open-drain DISC pin provides diagnostic information on LED disconnection conditions.

The STCS2ASPR operates as a linear constant current regulator with four key subsystems: 1) Current Regulation Loop: The internal sense amplifier compares the voltage across the external feedback resistor (RFB) with the internal 100mV reference. The driver adjusts the main pass transistor to maintain 100mV across RFB, producing a constant LED current of ILED = 100mV / RFB. 2) PWM Dimming: When the PWM input is high, the main switch is on and current flows through the LEDs. When PWM is low, the switch turns off, enabling duty-cycle-based brightness control at frequencies up to 50kHz. 3) Slope Control: An external capacitor on the SLOPE pin controls the gate drive ramp rate, setting the current rise and fall times. This reduces EMI by limiting di/dt during switching. 4) Protection and Diagnostic: The thermal shutdown disables the output at 155C. The DISC pin monitors the drain voltage and indicates a load disconnection when the drain-to-ground voltage drops below 75mV.

Pin Name Type Function
1 VCC Power Supply voltage (4.5V to 40V)
2 EN Input Enable input (active high, shutdown when low)
3 PWM Input PWM dimming input
4 FB Input Current feedback sense (100mV reference)
5 SLOPE Input Slope control capacitor connection
6 GND Ground Ground connection
7 BYP Power Internal 3.3V bypass (100nF cap to GND)
8 DISC Output Load disconnection diagnostic (open-drain)
9 DRAIN Output Internal MOSFET drain (connect to LED cathode)
10 SOURCE Output Internal MOSFET source (connect to FB resistor)
Tab GND Ground Thermal pad, connect to GND
  • Low-voltage LED lighting systems powered from 5V, 12V, or 24V supplies
  • Automotive interior and exterior LED lighting with PWM dimming
  • Architectural and signage LED illumination
  • RGB LED color mixing with independent current channels
  • Industrial indicator and status LED arrays
Manufacturer Part Number Package Notes
ST STCS2APH PowerSO-10 Through-hole version
ST STCS1SPR PowerSO-10 1.5A version, same family
TI TLD4062-2SV PG-DSO-14 1.5A LED driver, similar
onsemi NSI45020AT1G SOD-123 20mA constant current, simpler
Infineon BTS50055-1TAA TO-252 High-side switch for LED
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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