MP4056—TRIAC DIMMABLE, NON-ISOLATED OFFLINE LED CONTROLLER WITH APFC

MP4056 Rev.1.01

www.MonolithicPower.com

14

11/9/2016

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© 2016 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

SOIC8

SOIC14

MSOP10

1

2

1

MULT

One of the Internal Multiplier’s Inputs. 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 is also used for dimmer type and 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 from

(OVP) threshold after a blanking time when the internal MOSFET turns

off. The ZCD 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

MO

SFET’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. DIM is used to control the color temperature and brightness

for warm sunset dimming or drive an external dummy load to enlarge the

dimming depth. It is the compliment signal to the TRIAC dimming; i.e. as

TRIAC commands less LED current, DIM duty cycle commands more.

5

9

6

D

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

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

VCC through a diode and a JFET to form an internal charging circuit for

VCC. There is an internal series-connected MOS and diode 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, the gate signal turns off. Over-current occurs

if S exceeds OCP threshold during the 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 COMP to a compensation network

(typically a capacitor to ground) to stabilize the LED driver and accurately

control the LED driver current.

1,7,8,14

NC