EUP6514
Pin Configurations
Package Type
Pin Configurations
SOP-8
Pin Description
PIN
PIN
DESCRIPTION
Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor
between BOOT pin and the PHASE pin. The bootstrap capacitor provides the charge
to turn on the upper MOSFET.
1
BOOT
Upper gate driver output. Connect to the gate of high-side power N-Channel
MOSEFT. This pin is monitored by the adaptive shoot-through protection circuitry to
determine when the upper MOSFET has turned off.
Both signal and power ground for the IC. All voltage levels are measured with
respect to this pin. Ties the pin directly to the low-side MOSFET source and ground
plane with the lowest impedance.
Lower gate drive output. Connect to the gate of low-side power N-Channel
MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to
determine when the lower MOSFET has turned off.
Connect this pin to a well-decoupled 5V or 12V bias supply. It is also the positive
supply for the lower gate driver, LGATE.
Switcher feedback voltage. This pin is the inverting input of the error amplifier. FB
senses the switcher output through an external resistor divider network.
This pin provides multi-function of the over-current setting, UGATE turn-on POR
sensing, and shut-down features. Connecting a resistor (ROCSET) between OPS and
PHASE pins sets the over-current trip point.
2
3
4
UGATE
GND
LGATE
5
6
VCC
FB
7
8
OPS
Pulling the pin to ground resets the device and all external MOSFETs are turned off
allowing the output voltage power rails to float.
This pin is also used to detect VIN in power on stage and issues an internal POR
signal.
Connect this pin to the source of the upper MOSEFT and the drain of the lower
MOSFET.
PHASE
DS6514 Ver 1.1 Aug. 2008
2
EUTECH [ EUTECH MICROELECTRONICS INC ]
