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FAN7387 — Self-Oscillated, High-Voltage Gate Driver
March 2014
FAN7387
Self-Oscillated, High-Voltage Gate Driver
Features
Internal Clock Using RCT
External Sync Function Using RCT
Dead Time Control Using Resistor
Shut Down (Disable Mode)
Internal Shunt Regulator
UVLO Function, High and Low Side
Description
The FAN7387 is a simple control IC for common half-
bridge inverters, SMPS, and ballast for fluorescent and
HID lamps. The FAN7387 has an oscillating circuit using
an external resistor and capacitor.
The frequency variation is very stable across a wide
temperature range. The FAN7387 has an external pin
for dead-time control and shutdown. Using this resistor,
the designer can choose the optimum dead time to
reduce power loss on switching devices, such as
transistors and MOSFETs.
Applications
Half-Bridge Inverter
SMPS
Ballast Solution for High-Intensity Discharge
(HID) Lamp
Ballast for Fluorescent Lamp
8-DIP
8-SOP
Ordering Information
Part Number
FAN7387MX
(1)
Note:
1.
These device passed wave soldering test by JESD22A-111.
Package
8-SOP
Operating Temperature
-40 to +125°C
Packing Method
Tape & Reel
© 2008 Fairchild Semiconductor Corporation
FAN7387 • 1.0.4
www.fairchildsemi.com
FAN7387 — Self-Oscillated, High-Voltage Gate Driver
Typical Applications Diagrams
C1
D1
VDD
CT
1
RCT
VB
VDC
C2
8
7
6
D2
R1
M1
C3
C4
C5
FAN7387
RT1
RDT
2
VDD
3
DT/ SD
HO
VS
R2
LO
D3
M2
C6
Q1
Frequency
Control
GND
Q2
Cb* RT2
Shutdown
4
GND
5
* Note: This capacitor, Cb, is for system stability and must use at least 470nF.
FAN7387 Rev1.0
Figure 1. Typical Application Circuit for SMPS (Self Oscillation Method)
Figure 2. Typical Application Circuit for SMPS by Using External Signal
© 2008 Fairchild Semiconductor Corporation
FAN7387 • 1.0.4
www.fairchildsemi.com
2
FAN7387 — Self-Oscillated, High-Voltage Gate Driver
Internal Block Diagram
15V
Shunt
SHORT-PULSE
GENERATOR
Figure 5. Functional Block Diagram
Dead-time
Generation
Low-Side
First Logic
Pin Configuration
Figure 6. Pin Configurations (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
RCT
VDD
DT/SD
GND
LO
VS
HO
VB
Supply Voltage.
Description
Oscillator frequency set resistor and capacitor.
Dead-time control and shutdown (active LOW).
Signal Ground.
Low-Side Output.
High-Side floating supply return.
High-Side output.
High-Side floating supply.
© 2008 Fairchild Semiconductor Corporation
FAN7387 • 1.0.4
www.fairchildsemi.com
4
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