MP4030—PRIMARY-SIDE-CONTROL, OFFLINE LED CONTROLLER WITH PFC

MP4030 Rev.1.02

www.MonolithicPower.com

6

4/16/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Pin Function

1

MULT

One of the Internal Multiplier Input. Connect to the tap of resistor divider from the rectified

voltage of the AC line. The half-wave sinusoid signal to this pin provides a reference signal

for the internal current control loop. The MULT pin also detects the TRIAC dimming phase.

2

ZCD

Zero-Current Detection. A negative going edge triggers the internal MOSFET’s turn-on

signal. Connect to the tap of a resistor divider from the auxiliary winding to GND. The ZCD

exceeds the over-voltage-protection (OVP) threshold after a 2µs blanking time when the

interval after the leading edge blanking time

3

VCC

Supply Voltage. Supplies power for both the control signal and the internal MOSFET’s gate

driver. Connect to an external bulk capacitor—typically 22µF with a 100pF ceramic

capacitor to reduce noise.

4

DP

Dimming Pull-Down. Drain of the internal dimming pull-down MOSFET. Connect a resistor

from this pin to the D pin to pull down the rectified input voltage during the TRIAC dimming

OFF interval.

5

S

Internal Low-Side main MOSFET Source. Connect a resistor from this pin to GND to sense

the internal MOSFET current. An internal comparator compares the resulting voltage to the

internal sinusoid shaped current reference signal to determine when the MOSFET turns off.

If the voltage exceeds the current-limit threshold of 2.3V after the leading edge blanking

time during the turn-on interval, the gate signal turns off.

6

D

Internal Low-Side main MOSFET Drain. This pin also internally connects to VCC via a diode

side MOSFET.

7

GND

Ground. Current return of the control signal and the gate drive signal.

8

COMP

Loop Compensation. Connects to a compensation network to stabilize the LED driver and

accurately control the LED driver current. The COMP pin can also monitor for short-circuit

conditions: if the COMP voltage rises above 5V, the short-circuit protection triggers.