LT1725IS Linear Technology, LT1725IS Datasheet - Page 23
LT1725IS
Manufacturer Part Number
LT1725IS
Description
IC CNTRLR ISOLATD FLYBACK 16SOIC
Manufacturer
Linear Technology
Type
Flybackr
Datasheet
1.LT1725ISPBF.pdf
(28 pages)
Specifications of LT1725IS
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-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output
-
Voltage - Output
-
Voltage - Input
-
Power - Output
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1725IS
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LT1725IS#PBF
Manufacturer:
LT
Quantity:
800
Part Number:
LT1725IS#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1725IS#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
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