LT1072CT Linear Technology, LT1072CT Datasheet - Page 9

• Manufacturer Part Number: LT1072CT
• Description: IC SW REG 1.25A HI-EFF TO-220-5
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Cuk, Flyback, Forward Converterr

Specifications of LT1072CT

• 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: 0°C ~ 100°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LT1072 OPERATIO
TYPICAL APPLICATIO S
GND
V
IN
LT1072
Synchronizing with Bipolar Transistor
C1
R3
V
5V
IN
V
C
2N2369
25µF*
C5
+
U
R2
2.2k
68pF
U
C2
GND
LT1072
V
V
0V
IN
IN
R1
3k
0
V
C
V
FROM 5V
LT1072 • OP01
SW
FB
C2
0.01µF
LOGIC
Totally Isolated Converter
t
OFF
2.7k
R4
500Ω
5k
≈ 16V
V
t
ON
OUT
C3
0.47µF
R2
+ V
N = 0.875 = 7:8
FOR V
f
(V
f
OUT
= DIODE FORWARD VOLTAGE)
1:N
= 15V
N • V
GND
*REQUIRED IF INPUT LEADS ≥ 2”
V
IN
N
N
D1
IN
LT1072
+
+
SWITCH VOLTAGE
SECONDARY VOLTAGE
C1
R3
Synchronizing with MOS Transistor
C1
200µF
C4
200µF
V
C
VN2222*
COM
–15V
15V
*SILICONIX OR EQUIVALENT
OUTPUT FILTER
10µH
10µH
L1
L2
OPTIONAL
R2
2.2k
1N4158
D1
+
+
C5
200µF
C6
200µF
LT1072 • TA03
D2
1N4158
200pF
C2
LT1072
FROM 5V
LT1072 • OP02
LOGIC
1072fc
9