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BD18326NUF-M ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 6 Page - Rohm

๋ถ€ํ’ˆ๋ช… BD18326NUF-M
์ƒ์„ธ๋‚ด์šฉ  40 V 600 mA 1ch Constant Current Driver for Automotive LED Lamps
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BD18326NUF-M ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 6 Page - Rohm

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ฉ 2020 ROHM Co., Ltd. All rights reserved.
BD18326NUF-M
28.Sep.2020 Rev.001
www.rohm.com
TSZ22111 ? 15 ? 001
TSZ02201-0T1T0B300340-1-2
Description of Blocks ? continued
(Unless otherwise specified, Tj = 25 ฐC, VIN = 13 V)
4. PWM Dimming Operation
PWM dimming is performed by connecting external parts to the CRT pin and the DISC pin as shown below. PWM
dimming frequency and ON duty width can be set by the values of the external resistor RCRT and the external capacitor
CCRT. When use the DC mode only, connect the CRT pin to the VIN pin and open the DISC pin.
A triangular waveform is generated when the DC SW is open as shown below. Output current IOUT is turned OFF
while the CRT pin voltage ramps up and IOUT is turned ON while the CRT pin voltage is ramp down.
Once the CRT pin voltage is VCRT_DIS1 (2.0 V (Typ)) or more, it turns to DC mode. And once the CRT pin voltage is
more than VCRT_DIS2 (2.4 V (Typ)), the DISC pin ON resistance changes from RDISC1 (50 ? (Typ)) to RDISC2 (5 k? (Typ))
and the power consumption of the IC is reduced by reducing the inflow current of the DISC pin.
PWM Dimming Operation
CRTIMER
GND
CRT
Control
Logic
VREG
CCRT
RCRT
ICRT
VIN
DISC
DC SW
IOUT
RDISC1
RDISC2
VCRT_DIS2
VCRT_DIS1
OUT
Current
Driver
100 mA
to 600 mA
2.0 V (Typ)
0.8 V (Typ)
IOUT
ON
IOUT
OFF
VCRT_DIS1
VCRT_CHA
tOFF
tON
tOFF = ?V
CRT
x CCRT
ICRT
= RCHA x CCRT
tON = - (RCRT + RDISC1) x CCRT x ln V
CRT_CHA
VCRT_DIS1
IOUT
ON
IOUT
OFF
IOUT
ON
IOUT
OFF
?
VCRT
Ramp up
Ramp down
CRT Pin
Voltage
Output Current
IOUT
(
)


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