MP4033—PRIMARY-SIDE–CONTROL, OFFLINE LED CONTROLLER WITH PFC

MP4033 Rev. 1.0

www.MonolithicPower.com

14

10/22/2014

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

© 2014 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

SOIC-8 SOIC-14 MSOP-10

1

2

1

MULT

One of the Internal Multiplier’s Input. Connect to the tap of resistor divider

from the rectified voltage of the AC line. The half-wave sinusoid signal on

this pin provides a reference signal for the internal current control loop.

The MULT pin is also used for dimmer type detection and dimming

phase detection.

2

3

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 over-voltage condition is detected in

ZCD pin.

protection (OVP) threshold after a blanking time when the internal

MOSFET turns off. The ZCD pin is also used to select the Strong/Weak

Dimming Pull Down Current in leading edge dimming. Besides, the ZCD

itself has short circuit protection to prevent the device damage when

output is open and ZCD pin is short.

3

4

3

VCC

Supply Voltage. Supply power for both the control signal and the internal

MOSFET’s gate driver. Connect this pin to an external bulk capacitor—

typically 22µF.

4

5

4

DAMP Gate Control pin of the external Damping MOSFET.

NA

6

5

DIM

Gate driver. This is the DIM signal from internal control logic, it is used to

control the color temperature and brightness for warm sunset dimming or

drive an external dummy Load to enlarge the dimming depth..

5

9

6

D

Internal Low-Side main MOSFET Drain. It is connected to the source of

the external high-side main MOSFET. This pin is also internally

connected to VCC thro a diode and a JFET to form an internal charging

circuit for VCC. There is a series-connected MOS and diode internally to

pull up the D to VCC at fault condition to turn off the main switch reliably.

There is an intelligent Dimming Pull Down Current Source on this pin.

6

10

7

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 upper current-clamp threshold after the

leading edge blanking time during the turn-on interval, the gate signal

gate-on interval after the OCP lead edge blanking time.

NA

11

8

NTC

LED temperature protection input. Connecting a NTC resistor from this

pin to GND reduces the output current in high ambient temperature to

protect the LED and driver. Analog dimming is accomplished with an

external PWM signal through a resistor. A 1kΩ resistor is recommended.

7

12

9

GND

Ground. Current return of the control signal and power signal.

8

13

10

COMP

Loop Compensation. Connect it to a compensation network to stabilize

the LED driver and accurately control the LED driver current.

1,7,8,14

NC