DW3505A vs BCR320U/BCR420U Performance Parameter Test | DONGWOON Low Dropout Linear Constant Current Driver IC Selection Advantages

Keywords:DW3505A, DONGWOON Korea, BCR320U, BCR420U, DW3505A replace BCR320U, DW3505A compare BCR420U, Linear Constant Current Driver IC, Low Dropout Constant Current IC, PWM Dimming LED Driver IC, Automotive Lighting Constant Current Chip, Vehicle LED Decorative Light Driver, Low Power Constant Current IC, LED Driver With Thermal Protection, DW3505A Parameters, BCR320U Parameter Comparison

Overview:This article conducts a complete performance parameter test on DONGWOON DW3505A versus Infineon BCR320U and BCR420U. It makes a horizontal comparison from multiple dimensions including operating voltage, output current, dropout voltage, temperature protection, current accuracy, PWM dimming, high and low temperature characteristics. The test results prove that DW3505A features ultra-wide voltage range, ultra-low dropout voltage, built-in thermal derating protection and high-precision current stability. It is an ideal alternative to BCR320U/BCR420U for automotive lighting, LED decorative lights, backlight driving and industrial constant current solutions.

DW3505A vs BCR320U/BCR420U Full Parameter Comparison Table

Influence of High & Low Temperature on DW3505A Constant Current Output Characteristics

Test Condition: Input 12V, Output 3V, Output Current 60mA/150mA, Temperature Range -40℃~150℃

DW3505A Constant Current Output Accuracy Test Data

Output Current Accuracy @60mA: -1.3% ~ 0.68%

Output Current Accuracy @150mA: -1.52% ~ 1.31%

When DW3505A operates at 140℃~150℃ high temperature range and activates thermal derating protection, the output current will automatically drop to 1/4 of the normal value, ensuring chip and lamp safety.

BCR320U has no built-in thermal protection circuit, which brings burnout risk under high-temperature operation and is not suitable for harsh high-temperature working conditions of vehicle applications.

Influence of EN Pin Voltage Fluctuation on DW3505A Output Current Stability

DW3505A Test Condition: Input Voltage 30V, EN Voltage 0V~30V, Output Voltage 2V, RSET Configuration, Ta=25℃

BCR320U Test Condition: IOUT=F(VEN), VOUT=2V, REXT=3Ω, Refer to Datasheet Page 16

DW3505A can work normally when EN pin voltage is higher than 2V, with output current accuracy up to ±0.01%. It features excellent voltage adaptability and is ideal for vehicle power supply environment with large voltage fluctuation.

The output current of BCR320U fluctuates obviously with EN pin voltage. Its current stability and controllability are far lower than DW3505A, which is not conducive to high-precision LED lighting solution design.

Summary of Core Selection Advantages: DW3505A vs BCR320U/BCR420U

1. DW3505A supports 5~40V ultra-wide operating voltage, higher than BCR320U upper limit 25V. It perfectly adapts to harsh power supply scenarios of vehicle and industrial equipment, more friendly for automotive lighting solution selection.

2. DW3505A ultra-low dropout voltage only 0.1V@60mA, much lower than 1.4V of BCR series. It generates less heat and achieves higher power conversion efficiency, suitable for multi-LED series module design.

3. DW3505A is built-in with thermal derating protection, while BCR320U/BCR420U have no thermal protection function. DW3505A owns higher reliability and burnout resistance under long-term high-temperature continuous operation.

4. DW3505A current accuracy reaches ±5%, its stability under temperature and voltage fluctuation is far better than BCR420U with ±10% accuracy, delivering more uniform and consistent light brightness.

5. DW3505A supports up to 20kHz PWM dimming with smooth flicker-free dimming performance, better than 10kHz upper limit of BCR series, suitable for interior ambient light and backlight fine dimming applications.

DW3505A Selection FAQ

Q1: Can DW3505A directly replace BCR320U?
A1: Direct pin-to-pin compatible replacement available. DW3505A matches package size, features wider adjustable current range, ultra-low dropout voltage and built-in thermal protection, with overall performance surpassing BCR320U comprehensively.

Q2: Which one provides better PWM dimming effect, DW3505A or BCR420U?
A2: DW3505A supports 20kHz high-frequency PWM dimming, far exceeding 10kHz limit of BCR420U. It achieves smoother dimming transition and better flicker-free visual experience.

Q3: Can BCR320U be used in automotive high-temperature scenarios without thermal protection?
A3: Not recommended. BCR320U/BCR420U lack built-in thermal protection circuit, easy to burn out under long-term operation in summer high-temperature vehicle environment. DW3505A comes with thermal derating protection, more suitable for harsh working conditions of automotive lighting.

Q4: What is the biggest advantage of DW3505A compared with BCR series?
A4: Five core advantages: 40V ultra-high withstand voltage, 0.1V ultra-low on-state dropout voltage, tiny current drift under high and low temperature, built-in thermal protection and high-frequency PWM dimming. It is the preferred alternative device for industrial and vehicle LED constant current driver applications.