2011/09/06

Rev.A.3

2

EM8800A

Pin Assignment

Pin Name

Pin No.

Pin Function

TOFF

1

OFF Time Setting. A resistor to ground to set off time. Pulling this pin to ground will disable

the device.

PWMD

2

PWM Dimming. This pin is used for PWM dimming. When the voltage applied to this pin is

low, switching is inhibited. When the voltage applied to this pin is high, switching restarts.

VCC

3

Supply Voltage. This pin provides the bias supply for the EM8800A. The supply voltage is

internally regulated to 5VDD for internal control circuit. Connect a well-decoupled supply

voltage to this pin. Ensure that a decoupling capacitor is placed near the IC.

CS

4

Current Sense Input. This pin senses the peak current.

GATE

5

Driver OUTPUT. The output of the driver is connected to the gate of the external MOSFET.

GND

6

Signal and Power Ground for the IC. All voltages levels are measured with respect to this

pin. Tie this pin to the ground island/plane through the lowest impedance connection

available.

LD/SS

7

Linear Dimming and Soft Start. A capacitor connected to the pin sets the soft start period.

The voltage of this pin adjusts the peak current.

FAULT

8

Fault. This pin is asserted high when a fault condition is detected.