The TSCR420 & TSCR421 are Low-Side Constant Current Regulator (CCR) for linear LED driving. The device regulates with a preset 10mA nominal that can be adjusted with an external resistor up to 300mA. It is designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control, it can be used in multiple applications, as long as the maximum supply voltage to the device is lower than 40V. With the low-side control, the TSCR421 has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 10kHz by a microcontroller for LED dimming. The output current at higher temperatures is the result of the negative temperature coefficient of 0.07%/°C of the LED driver.
Key Features & Advantages
- AEC-Q100 qualified with the following results:
Device HBM ESD classification level H2
Device CDM ESD classification level C6
- Continuous output current up to 65mA with an external resistor
- Easy paralleling of drivers to increase current
- Supply voltage up to 40V
- Good temperature coefficient vs. output current
- PPAP capable
Application
- Ambient light
- Interior light
- Turn signals
- Rear cluster lighting
- Puddle & Sill lights
- Reading light
- Instrument cluster illumination
| Part Number | Breakdown Voltage(V) | Input Voltage(V) | Preset Current(mA) | Adj. Output Current(mA) | Configuration | PWM from MCU | Package |
|---|---|---|---|---|---|---|---|
| TSCR420CX6H | 40 | 1.4~40 | 10 | 10 ~ 300 | Low-Side | No | SOT-26 |
| TSCR421CX6H | 40 | 1.4~4.5 | 10 | 10 ~ 300 | Low-Side | Yes | SOT-26 |
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