lt1172ct-pbf Linear Technology Corporation, lt1172ct-pbf Datasheet - Page 7

• Manufacturer Part Number: lt1172ct-pbf
• Description: Lt1170hv - 100khz, 5a, 2.5a And 1.25a High Efficiency Switching Regulators
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
TYPICAL PERFOR A CE CHARACTERISTICS
–1000
7000
6000
5000
4000
3000
2000
1000
0
1k
Transconductance of Error
Amplifier
†
ALWAYS CONNECT E1 TO THE GROUND PIN ON MINIDIP, 8- AND 16-PIN SURFACE MOUNT PACKAGES.
E1 AND E2 INTERNALLY TIED TO GROUND ON TO-3 AND TO-220 PACKAGES.
FB
10k
SELECT
100kHz
MODE
W
1.24V
2.3V
REG
OSC
REF
V
W
IN
FREQUENCY (Hz)
–
+
100k
ERROR
AMP
U
g
m
1M
SHUTDOWN
CIRCUIT
1170/1/2 G19
10M
LOGIC
COMP
0.15V
–30
0
30
60
90
120
150
180
210
V
C
(LT1170 AND LT1171 ONLY)
FLYBACK
ERROR
AMP
GAIN
CURRENT
DRIVER
ANTI-
AMP
SAT
500
490
480
470
460
450
440
430
420
410
400
6
–50
Normal/Flyback Mode Threshold on
Feedback Pin
+
–
16V
–25
SWITCH
5A, 75V
FEEDBACK PIN VOLTAGE
FEEDBACK PIN CURRENT
SWITCH
(AT THRESHOLD)
0
OUT
(AT THRESHOLD)
E1
TEMPERATURE ( C)
†
25
0.02
(0.04
(0.16
LT1 170/LT1 171/LT1172
50
LT1172
LT1171)
LT1172)
75
100 125 150
E2
0.16
1170/1/2 G20
1170/1/2 BD
–24
–22
–20
–18
–16
–14
–12
–10
– 8
– 6
– 4
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