Datasheet

6
LT1072
1072fc
Transconductance of Error
Amplifier V
C
Pin Characteristics Switch “Off” Characteristics
FREQUENCY (Hz)
1000
TRANSCONDUCTANCE (µmho)
PHASE (°)
3000
4000
6000
7000
1k 100k 1M 10M
LT1072 • TPC19
–1000
10k
5000
2000
0
150
90
60
0
–30
210
30
120
180
G
m
θ
V
C
PIN VOLTAGE (V)
0
–400
V
C
PIN CURRENT (µA)
–300
–200
–100
300
100
0.5
1.0
200
0
1.5
2.0
2.5
LT1072 • TPC20
V
FB
= 1.5V (CURRENT INTO V
C
PIN)
V
FB
= 0.8V (CURRENT OUT OF V
C
PIN)
T
J
= 25°C
SWITCH VOLTAGE (V)
0
SWITCH CURRENT (µA)
600
800
1000
80
LT1072 • TPC21
400
200
500
700
900
300
100
0
2010
4030
60 70 90
50
100
V
SUPPLY
= 55V
V
SUPPLY
= 40V
V
SUPPLY
= 15V
V
SUPPLY
= 3V
–
+
2.3V
REG
40kHz
OSC
FB
V
C
SHUTDOWN
CIRCUIT
0.15V
0.16Ω
GAIN
≈ 6
GND
MODE
SELECT
LOGIC
COMP
V
IN
FLYBACK
ERROR
AMP
DRIVER
ANTI-
SAT
SWITCH
OUT
16V
–
+
0.16Ω
E1*
* ALWAYS CONNECT E1 TO GROUND PIN ON MINIDIP AND SURFACE MOUNT
PACKAGES. EMITTERS TIED TO GROUND ON TO-3 AND TO-220 PACKAGES
E2
1.24V
REF
ERROR
AMP
CURRENT
AMP
LT1072 • BD01
TYPICAL PERFOR A CE CHARACTERISTICS
UW
BLOCK DIAGRA
W