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NCL30082

Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting with Thermal Fold-back

ON Semiconductor 

NCL30082

.

.

Aux

.

VDIM

1

8

2

7

3

6

4

5

Figure 1. Typical Application Schematic for NCL30082

Table 1. PIN FUNCTION DESCRIPTION

Pin No Pin Name

Function

1

SD

Thermal Fold−back

and shutdown

2

ZCD

Zero Crossing Detection

3

CS

Current sense

4

GND

−

5

DRV

Driver output

6

VCC

Supplies the controller

7

VIN

Input voltage sensing

Brown−Out

8

DIM

Analog / PWM dimming

Pin Description

Connecting an NTC to this pin allows reducing the output current down to 50%

of its fixed value before stopping the controller. A Zener diode can also be

used to pull−up the pin and stop the controller for adjustable OVP protection

Connected to the auxiliary winding, this pin detects the core reset event.

This pin monitors the primary peak current

The controller ground

The current capability of the totem pole gate drive (+0.3/−0.5 A) makes it suit-

able to effectively drive a broad range of power MOSFETs.

This pin is connected to an external auxiliary voltage.

This pin observes the HV rail and is used in valley selection. This pin also

monitors and protects for low mains conditions.

This pin is used for analog or PWM dimming control. An analog signal than

can be varied between VDIM(EN) and VDIM100 can be used to vary the current,

or a PWM signal with an amplitude greater than VDIM100.

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