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FAN7387 — Self-Oscillated, High-Voltage Gate Driver
December 2008
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
FAN7387M
(1)
(1)
Package
Operating Temperature
Eco Status
RoHS
RoHS
Packing Method
Tube
Tape & Reel
Tube
FAN7387MX
8-SOP
8-DIP
-40 to +125°C
FAN7387N
For
Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
Note:
1.
These device passed wave soldering test by JESD22A-111.
© 2008 Fairchild Semiconductor Corporation
FAN7387 • 1.0.2
www.fairchildsemi.com
FAN7387 — Self-Oscillated, High-Voltage Gate Driver
Typical Applications Diagrams
C1
D1
VDD
CT
1
RCT
VB
VDC
C2
8
D2
R1
M1
C3
C4
C5
FAN7387
RT1
RDT
2
VDD
3
DT/ SD
HO
7
6
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 • 1.0.2
www.fairchildsemi.com
2
FAN7387 — Self-Oscillated, High-Voltage Gate Driver
Typical Application Diagrams
(Continued)
FAN7387
Figure 3.
Figure 4.
FAN7387
Typical Application Circuit for Full-Bridge Converter
Typical Application Circuit for Fluorescent Lamp Ballast
© 2008 Fairchild Semiconductor Corporation
FAN7387 • 1.0.2
www.fairchildsemi.com
3
FAN7387 — Self-Oscillated, High-Voltage Gate Driver
Internal Block Diagram
15V
Shunt
SHORT-PULSE
GENERATOR
Dead-time
Generation
Low-Side
First Logic
Figure 5.
Functional Block Diagram
Pin Configuration
VB
8
HO
7
VS
6
LO
5
FAN7387
YWW
( YWW : Work Week Code)
1
2
3
4
RCT VDD DT/SD GND
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 • 1.0.2
www.fairchildsemi.com
4
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