LT1725IGN Linear Technology, LT1725IGN Datasheet - Page 23

• Manufacturer Part Number: LT1725IGN
• Description: IC CNTRLR ISOLATD FLYBACK 16SSOP
• Manufacturer: Linear Technology
• Type: Flybackr

Specifications of LT1725IGN

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Frequency - Switching: 50kHz ~ 250kHz
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -

48V to Isolated 15V Application Parts List
T1: Coiltronics VP5-0155 VERSA-PAK
M1: International Rectifier IRF620. 200V, 0.8Ω N-channel
MOSFET
D1: Motorola MBRD660. 6A, 60V Schottky diode
D2: Motorola MBRS1100. 1A, 100V Schottky diode
D3, D4: 1N5257. 33V, 500mW Zener diode
D5: BAS16. 75V rectifier diode
C1: AVX TPSD226M025R0200. 22µF, 25V tantalum
capacitor
C2a, C2b, C2c: Vishay/Vitramon VJ1825Y155MXB. 1.5µF,
100V X7R ceramic capacitor
C3: 100pF, 100V, X7R ceramic capacitor
C4: Sanyo 20SV150M. 150µF, 20V, OS-CON electrolytic
capacitor
C5: 1µF, 25V, Z5U ceramic capacitor
C6: 1nF, 25V, X7R ceramic capacitor
C7: 47pF, 25V NPO/COG ceramic capacitor
TYPICAL APPLICATIO S
15.5
15.0
14.5
0
Application Regulation
0.5
V
1.0
IN
I
LOAD
= 36V
V
IN
(A)
1.5
= 72V
V
IN
= 48V
U
2.0
1725 F09b
2.5
C8: 0.1µF, 25V, Z5U ceramic capacitor
C9: 470pF, 25V, X7R ceramic capacitor
C10: 100pF, 25V, X7R ceramic capacitor
R1: 24k, 1/4W, 5% resistor
R2: IRC LR2010. 0.1Ω, 1/2W current sense resistor
R3: 34.0k, 1% resistor
R4: 3.01k, 1% resistor
R5, R6, R7: 51k, 5% resistor
R8: 6.2k, 5% resistor
R9: 51Ω, 5% resistor
R10: 18Ω, 5% resistor
R11: 150Ω, 1/4W, 5% resistor
R12: 5.1Ω, 5% resistor
R13a, R13b: 1.5k, 1/2W, 5% resistor
R14: 820k, 5% resistor
R15: 33k, 5% resistor
90
80
70
60
50
40
30
20
0.01
V
V
IN
OUT
= 48V
= 15V
Application Efficiency
0.1
I
LOAD
(A)
1
1725 F09c
10
LT1725
23
1725fa