L6591 Datasheet, PDF (1/32 Pages) STMicroelectronics – PWM controller for ZVS half-bridge

L6591
PWM controller for ZVS half-bridge
Features
■ Complementary PWM control for soft-switched
half-bridge with programmable dead-time
■ Up to 500 kHz operating frequency
■ On-board high-voltage start-up
■ Advanced light load management
■ Adaptive UVLO
■ Pulse-by-pulse OCP
■ OLP (latched or autorestart)
■ Transformer saturation detection
■ Interface with PFC controller
■ Latched disable input
■ Input for power-on sequencing or brownout
protection
■ Programmable soft-start
■ 4 % precision external reference
Figure 1. Typical application circuit
SO16 narrow
SO-16
■ 600 V-rail compatible high-side gate driver with
integrated bootstrap diode and high dV/dt
immunity
■ SO16N package
Applications
■ High power AC-DC adapter/charger
■ Desktop PC, entry-level server
■ Telecom SMPS
5
OSC
TIMING
HV
16
CLK
V CC
9
25 V
HV ge nerator ON/O FFa nd
a daptive UV LOmanag ement
Vre f
VREG
2
DIS
+
4.5V
-
R
SQ
1.5V
ISEN
3
PFC_STOP
8
1
LINE
1 5µA
HICCUP
-
+
OCP2
DI S
1.5V
-
+
BLANKI NG
R
Q
S
+
PWM
-
OCP2
Ilimre f
0 .8 V max.
LI NE_OK
+
OCP
-
SOFT-START
4
Low
UVLO
Vcc_OK
DIS
SQ
R
P WM _CT L
Vc c_O K
DIS
S HUT DO WN
LI NE_ OK
BURST- M ODE CTRL
+
VREG
0.3 2mA
3R
R
-
1.7 5V
-
+
2.0 V
7
SS
COMP
6
VREF
Sync hronou s
bo otstra p diode
15
BOOT
L EVEL
SHIFTER
V CC
14
HVG
13
FGND
L ow
UV LO
10
LV G
11
GND
June 2008
Rev 1
1/32
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