LTC3722-2_15 Datasheet, PDF (9/28 Pages) Linear Technology – Synchronous Dual Mode Phase Modulated Full Bridge Controllers

BLOCK DIAGRAM
LTC3722-1/LTC3722-2
LTC3722-2 Voltage Mode SYNC Phase-Shift PWM
V_CC
UVLO
18
12
V_REF
14
C_T
SYNC SPRG DPRG SBUS
24
1
13
5
10
V_CC UVLO
10.25V = ON
6V = OFF
FB
–
6
ERROR
AMPLIFIER
+
+
1.2V
COMP
4
–
5V
R1
50k
2
RAMP ^{– +}
650mV
5V
REF AND LDO
1.2V
REF GOOD
SYSTEM
UVLO
V_CC
GOOD
–
+
PHASE
MODULATOR
OSC
1 = ENABLE
0 = DISABLE
Q
T
QB
QB R
V_REF
QS
SS
12µA
7
SHUTDOWN
CURRENT
LIMIT
+
FAULT
LOGIC
650mV –
M2
R QB
S
PASSIVE
DELAY
SYNC
RECTIFIER
DRIVE
LOGIC
ACTIVE
DELAY
CS
3
BLANK +
23
300mV –
PULSE BY PULSE
GND
CURRENT LIMIT
PDLY
9
OUTA
21
OUTB
20
OUTE
16
OUTF
15
OUTC
19
OUTD
17
ADLY
11
372212 BD02
PGND
22
For more information www.linear.com/LTC3722
372212fb
9