MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK

MP4658 Rev. 1.0

MonolithicPower.com

11

10/13/2021

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FUNCTIONAL BLOCK DIAGRAM

LED1

LED2

LED3

LED4

IREF

Min

LED1

LED2

LED3

LED4

Min LEDx

GM

REF_LED

Gm_I

PWM

COMP1

Level Adjust

OPT

ISET

ADIM

Dimming

Control

DC ADIM

DC ADIM

Voltage

Adjustment

FB

OV_LED

5V

3V

5ms

Delay

LEDx

LED Protection

Management

EN_CHx

2

5

13

12

7

6

UVLO_VIN

Delay

PDIM

LDO

VCC

1

8

15

3

GM_V

PWM_N

4

COMP2

PWM

PWM_N

OVP

PWM

100mV

LEDx

OVP

10µs

Delay

11

10

OVP

2.4V

1.2V

OV VSYS

Fault LED

Fault Control

0.5V

Fault

Fault

S1

S2

.

.

.

.

.

.

1.2 * VREF_VFB

VIN

Figure 1: Functional Block Diagram