MP4060—TRIAC Dimmable PFC, PSC LED Controller for 200-265VAC LEDs

MP4060 Rev. 1.0

www.MonolithicPower.com

14

5/27/2015

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PIN FUNCTIONS

Pin #

SOIC-8

Pin#

MSOP-10

Name

Description

1

1

MULT

One of the internal multiplier inputs.

Connect MULT to the tap of a

resistor divider from the rectified voltage of the AC line. The half-wave

sinusoid signal on MULT provides a reference signal for the internal

current control loop. MULT is also used for dimmer type detection and

dimming phase detection.

2

2

ZCD

Zero-current detection

. A falling edge triggers the internal MOSFET’s

turn-on signal. Connect ZCD to the tap of a resistor divider from the

auxiliary winding to GND. ZCD detects the over-voltage condition. Over-

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

ZCD is also used to select the strong/weak dimming pull-down current

in leading-edge dimming. ZCD detects the output short-circuit condition.

3

3

VCC

Supply voltage.

VCC provides the supply power for both the control

signal and the internal MOSFET’s gate driver. Connect VCC to an

external bulk capacitor (22 µF, typically).

4

5

BD

Bleeder disable output.

BD integrates a FET. Its open-drain output is

applied to pull down the external active bleeder’s control signal to

disable the bleeder.

5

6

D

Internal low-side main MOSFET drain.

D is connected to the source

of the external high-side main MOSFET. Also, B is connected internally

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

for VCC. There is a MOSFET and diode connected in series internally to

pull up D to VCC during a fault condition, which turns off the main switch

reliably. There is an intelligent dimming pull-down current source on D.

6

7

S

Internal low-side main MOSFET source.

Connect a resistor from S 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 turns off. Over-

after the OCP leading-edge blanking time.

7

9

GND

Ground

. Current return of the control signal and power signal.

8

10

COMP

Loop compensation.

Connect COMP to a compensation network to

stabilize the LED driver and accurately control the LED driver current.

--

4

DAMP Gate control pin of the external damping MOSFET.

--

8

DIM

Gate driver.

The DIM signal from the internal control logic. 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.