BD18326NUF-M datasheet(6/39 Pages) ROHM

部品番号	BD18326NUF-M

部品情報	40 V 600 mA 1ch Constant Current Driver for Automotive LED Lamps

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メーカー	ROHM [Rohm]

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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 °C, 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 Ω (Typ)) to RDISC2 (5 kΩ (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 = ΔV

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

Δ

VCRT

Ramp up

Ramp down

CRT Pin

Voltage

Output Current

IOUT

(

)

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