LT1072IN8 Linear Technology, LT1072IN8 Datasheet - Page 6

• Manufacturer Part Number: LT1072IN8
• Description: IC SWTCHNG REG 1.25A HI-EFF 8DIP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Cuk, Flyback, Forward Converterr

Specifications of LT1072IN8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 1.25A
• Frequency - Switching: 40kHz
• Voltage - Input: 3 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

BLOCK DIAGRA
LT1072
6
TYPICAL PERFOR A CE CHARACTERISTICS
–1000
7000
6000
5000
4000
3000
2000
1000
0
1k
Transconductance of Error
Amplifier
10k
FREQUENCY (Hz)
100k
G
m
W
1M
W
FB
LT1072 • TPC19
SELECT
MODE
40kHz
1.24V
2.3V
REG
OSC
REF
V
U
IN
10M
–30
0
30
60
90
120
150
180
210
–
+
ERROR
AMP
–100
–400
–200
–300
300
200
100
0
SHUTDOWN
CIRCUIT
0
V
V
C
FB
Pin Characteristics
= 1.5V (CURRENT INTO V
V
LOGIC
COMP
FB
0.5
0.15V
V
= 0.8V (CURRENT OUT OF V
C
V
C
GND
PIN VOLTAGE (V)
T
1.0
* ALWAYS CONNECT E1 TO GROUND PIN ON MINIDIP AND SURFACE MOUNT
J
= 25°C
PACKAGES. EMITTERS TIED TO GROUND ON TO-3 AND TO-220 PACKAGES
FLYBACK
ERROR
AMP
1.5
C
PIN)
GAIN
CURRENT
≈ 6
DRIVER
ANTI-
2.0
SAT
AMP
LT1072 • TPC20
C
PIN)
16V
+
–
2.5
0.16Ω
SWITCH
1000
900
800
700
600
500
400
300
200
100
OUT
E1*
0
Switch “Off” Characteristics
0
V
SUPPLY
E2
10
0.16Ω
V
20
SUPPLY
= 3V
SWITCH VOLTAGE (V)
30
= 15V
V
40
SUPPLY
50
V
= 40V
SUPPLY
60 70
LT1072 • BD01
= 55V
80
LT1072 • TPC21
90
1072fc
100