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

MP4658 Rev. 1.0

MonolithicPower.com

3

10/13/2021

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PIN FUNCTIONS

Pin #

Name

Description

1

PDIM

PWM dimming input pin. Connect a pulse signal to implement pulse-width modulation

(PWM) dimming. When the PDIM pin

’s voltage remains low for 30ms, the LED stage is

disabled and the IC enters constant voltage (CV) mode.

2

OPT

Optocoupler pin. This pin outputs the compensation signal for the primary-side flyback

power stage. Connect this pin to the external optocoupler to control the flyback.

3

FB

System voltage feedback. Connect this pin to the system output through a voltage

divider.

4

COMP2

Compensation pin. This pin compensates the output voltage (VOUT) loop and controls the

flyback power stage during the LED off period.

5

COMP1

Compensation pin. This pin compensates the LED current loop and controls the flyback

power stage during the LED on period.

6

OVP

Over-voltage protection (OVP) pin. Connect this pin to the LED voltage (VLED) output

through a voltage divider.

7

LED1

Cathode of LED string 1.

8

LED2

Cathode of LED string 2.

9

GND

Ground.

10

LED4

Cathode of LED string 4.

11

LED3

Cathode of LED string 3.

12

ISET

LED current set pin. This pin sets the LED current. Connect a resistor from this pin to the

ground to set the LED current (ILED).

13

ADIM

Analog dimming input pin. Connect a >5kHz PWM signal to implement analog dimming.

The input impedance of this pin determines the internal filter constant, as well as the PWM

dimming rise and fall times. When the ADIM pin

’s voltage remains low for 30ms, the LED

stage is disabled and the IC enters CV mode.

14

NC

Not connected.

15

VIN

Input supply pin. This pin powers all internal logic circuitry.

16

FF

Fault indicator pin. If a fault occurs, this pin is pulled low.

ABSOLUTE MAXIMUM RATINGS (1)

VIN .............................................. -0.3V to +38V

LEDx............................................ -0.3V to +80V

FF .............................................. -0.3V to +12V

Other pins ................................... -0.3V to +6.5V

Junction temperature ............................... 150°C

Lead temperature .................................... 260°C

Continuous power dissipation (TA = 25°C) (2)

................................................................1.56W

Storage temperature................ -60°C to +150°C

ESD Ratings

Human body model (HBM) ....................±2000V

Charged device model (CDM)..................±750V

Recommended Operating Conditions (3)

Supply voltage (VIN) ........................... 6V to 36V

Operating junction temp (TJ) .... -40°C to +125°C

Thermal Resistance (4)

θJA

θJC

SOIC-16 ................................. 80 ...... 35... °C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The maximum allowable power dissipation is a function of the

maximum junction temperature TJ (MAX), the junction-to-

ambient thermal resistance θ

JA, and the ambient temperature

TA. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by PD (MAX) = (TJ

(MAX) - TA) / θJA. Exceeding the maximum allowable power

dissipation produces an excessive die temperature, causing

the regulator to go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent

damage.

3) The device is not guaranteed to function outside of its

operating conditions.

4) Measured on JESD51-7, 4-layer PCB.