LTC3722-1 LINER [Linear Technology], LTC3722-1 Datasheet - Page 6

• Manufacturer Part Number: LTC3722-1
• Description: Synchronous Dual Mode Phase Modulated Full Bridge Controllers
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
LTC3722-1/LTC3722-2
SYNC (Pin 1/Pin 1): Synchronization Input/Output for the
Oscillator. The input threshold for SYNC is approximately
1.5V, making it compatible with both CMOS and TTL logic.
Terminate SYNC with a 5.1k resistor to GND.
DPRG (Pin 2/Pin 5): Programming Input for Default Zero
Voltage Transition (ZVS) Delay. Connect a resistor from
DPRG to V
outputs A, B, C, D. The delay is approximately equal to
(1.66e-12 x R
RAMP (NA/Pin 2): Input to Phase Modulator Comparator
for LTC3722-2 only. The voltage on RAMP is internally
level shifted by 650mV.
TYPICAL PERFOR A CE CHARACTERISTICS
6
160
150
140
130
120
110
100
10.5
10.4
10.3
10.2
10.1
10.0
U
90
80
70
9.9
9.8
–55
–55
Start-Up I
V
Temperature
I
CC
CC
= 10mA
–25
Shunt Voltage vs
U
–25
REF
DPRG
CC
TEMPERATURE ( C)
TEMPERATURE ( C)
5
to set the maximum turn on delay for
5
vs Temperature
). The nominal voltage on DPRG is 2V.
U
35
35
65
(LTC3722-1/LTC3722-2)
65
W
95
95
3722 • G08
3722 • G11
U
125
125
1.278
1.276
1.274
1.272
1.270
1.268
1.266
1.264
1.262
1.260
1.258
1.256
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
–55
–55
Delay Hysteresis Current vs
Temperature
Delay Pin Threshold vs
Temperature
SBUS = 1.5V
SBUS = 2.25V
–25
–25
TEMPERATURE ( C)
TEMPERATURE ( C)
5
5
CS (Pin 3/Pin 3): Input to phase modulator for the
LTC3722-1. Input to Pulse by Pulse and Overload Current
Limit Comparators, Output of Slope Compensation Cir-
cuitry. The pulse by pulse comparator has a nominal
300mV threshold, while the overload comparator has a
nominal 600mV threshold.
COMP (Pin 4/Pin 4): Error Amplifier Output, Inverting
Input to Phase Modulator.
R
ing. Use a 10k to 100k resistor to program from 40ns to
310ns of leading edge blanking of the current sense signal
on CS for the LTC3722-1. A 1% tolerance resistor is
35
35
LEB
SBUS = 1.5V
65
65
(Pin 5/NA): Timing Resistor for Leading Edge Blank-
95
95
3722 • G12
3722 • G09
125
125
1.202
1.201
1.200
1.199
1.198
1.197
1.196
1.195
1.194
90
80
70
60
50
40
30
20
10
0
–55
–55
Slope Current vs Temperature
FB Input Voltage vs Temperature
C
T
= 1V
–25
–25
TEMPERATURE ( C)
TEMPERATURE ( C)
5
5
35
35
65
65
C
T
= 2.25V
95
95
3722 • G10
372212i
3722 • G13
125
125