Datasheet Diodes BCR421UFDQ-7 — 数据表

BCR420UFDQ / BCR421UFDQ
LINEAR LED CONSTANT CURRENT REGULATOR IN U-DFN2020-6 Description Features These Linear LED drivers are designed to meet the stringent
requirements of automotive applications. п‚ The BCR420U and BCR421U monolithically integrate transistors,
diodes and resistors to function as a 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
350mA. 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 < 40V.
With the low-side control, the BCR421U has an Enable (EN) pin
which can be pulse-width modulated (PWM) up to 25kHz by a microcontroller for LED dimming.
With no need for additional external components, this CCR is fully
integrated into a 2mm x 2mm x 0.6mm package (U-DFN2020-6)
minimizing PCB area, off-board height, and component count. п‚ п‚ LED Constant Current Regulator Using NPN Emitter-Follower with
Emitter Resistor to Current Limit
IOUT – 10mA ±10% Constant Current (Preset)
IOUT up to 350mA Adjustable with an External Resistor п‚ п‚ (BCR421U)
VOUT – 40V Supply Voltage
PD up to 1.7W in U-DFN2020-6 Package п‚ п‚ п‚ 0.6mm Height for Low-profile Edge Lighting
Low-Side Control Enabling PWM Input < 25kHz (BCR421U)
Negative Temperature Coefficient (NTC) Reduces IOUT with п‚ п‚ п‚ п‚ п‚ Increasing Temperature …