BD8381EFV-E2 Rohm Semiconductor, BD8381EFV-E2 Datasheet - Page 8

• Manufacturer Part Number: BD8381EFV-E2
• Description: LED Drivers AUTOMOTIVE GRADE LED DRIVER
• Manufacturer: Rohm Semiconductor

Specifications of BD8381EFV-E2

• Operating Supply Voltage: 5 V to 30 V
• Maximum Supply Current: 7 mA
• Maximum Power Dissipation: 1.45 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: HTSSOP-28
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

・LED Short Detection
●High luminance LED (multichip) with built-in LED of X piece in 1chip when using Y piece
●When using the single chip
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BD8381EFV-M
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When the voltage between LEDR-pin and LEDC-pin ≥ 0.2 (TYP), the internal counter starts operating, and approximately
after 100ms (when FOSC = 300kHz) the operation latches off. With the PWM brightness control, the detecting operation is
processed only when PWMOUT-pin = High. If the condition of the detection operation is released before 100ms (when FOSC
= 300kHz), then the internal counter resets.
There is a possibility that the LED short detection malfunctions when the difference of Vf is large. Therefore, please adjust
external resistance for connected Vf. It is recommended 2V-3V to the input range of LEDR and LEDC.
※ The counter frequency is the DCDC switching frequency determined by the RT. The latch proceeds at the count of 32770.
Y piece
Y piece
PWMOUT
PWMOUT
FB
FB
piece
X
Fig. 15
Fig. 14
VOUT(DC/DC output）
VOUT(DC/DC output）
R
R
1
2
R
R
1
2
R
R
3
4
R
R
3
4
LEDR
LEDC
LEDR
LEDC
Setting method
R1：R2 = X：1
R3：R4 = ( X + 1 ) Y – 1：1
Setting method
R1：R2 = 1：1
R3：R4 = 2Y – 1：1
8/20
2010.10 - Rev.0.11
Technical Note