BCR401UW6 / Diodes Incorporated - 데이터시트(PDF) Chat AI

BCR401UW6 Datasheet with Chat AI

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# Example questions: ➢ Explain how the reverse polarity protection circuit using the bas40brw (figure 10) differs from simply using a diode in line with the driver/led combination (figure 9) and what advantage does the bas40brw circuit offer?
➢ What factors contribute to the error between the theoretical and measured led current when using pwm dimming, and what recommendations are made to minimize this error?
➢ What are the key benefits of using the power path switching method (figure 3c) for pwm dimming compared to enabling/disabling the led driver itself?

Part No.	BCR401UW6_17
Manufacturer	DIODES
Size	454 Kbytes
Pages	13 pages
Description	LED CONSTANT CURRENT REGULATOR

Datasheet Summary with AI

1. Overview & Function

️· BCR401UW6: A low-voltage LED driver (part of the BCR40x series).
️· Typical Use: Driving LEDs or strings of LEDs.
️· Internal Resistor (RINT): Comes with a pre-set internal resistor. There are three versions:
- RINT ≈ 91Ω (LED current ≈ 10mA)
- RINT ≈ 20Ω (LED current ≈ 20mA)
- RINT ≈ 16.5Ω (LED current ≈ 50mA)
️· Adjustable LED Current: LED current can be adjusted by adding an external resistor (REXT).
️· Negative Temperature Coefficient: Allows for easy paralleling of BCR devices.

2. Application Circuits & Techniques

️· Figure 1 (Typical Application): Standard LED driver setup.
️· Figure 2 (Parallel Operation): Connecting multiple BCR devices in parallel to increase current. Requires attention to heat dissipation (thermal resistance).
️· Figure 3a, 3b, 3c (PWM Dimming): Demonstrates different PWM dimming approaches:
- 3a: Enabling/disabling the LED driver itself.
- 3b: Switching the power path to the LEDs (most common).
- 3c: Switching power path - provides significantly improved PWM resolution.
️· Figure 9 (Reverse Polarity Protection): Using a Schottky diode (e.g., SDM10U45LP, SBR02U100LP, SBR0220LP) in series with the driver to protect against reverse polarity. This method prevents operation until the issue is resolved.