Product Summary

The LT1725CGN#TR is a monolithic switching regulator controller specifically designed for the isolated flyback topology. The LT1725CGN#TR drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback information, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power up to tens of watts. The LT1725CGN#TR is ideal for: (1)Telecom Isolated Converters; (2)Offline Isolated Power Supplies; (3)Instrumentation Power Supplies.

Parametrics

LT1725CGN#TR absolute maximum ratings: (1)VCC Supply Voltage: 22V; (2)UVLO Pin Voltage: VCC; (3)ISENSE Pin Voltage: 2V; (4)FB Pin Current: ±2mA; (5)Operating Junction Temperature Range: LT1725C: 0℃ to 100℃; LT1725I: –40℃ TO 125℃; (6)Storage Temperature Range: –65℃ to 150℃; (7)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LT1725CGN#TR features: (1)Drives External Power MOSFET with External ISENSE Resistor; (2)Application Input Voltage Limited Only by External Power Components; (3)Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required; (4)Accurate Regulation Without User Trims; (5)Regulation Maintained Well into Discontinuous Mode; (6)Switching Frequency from 50kHz to 250kHz with External Capacitor; (7)Optional Load Compensation; (8)Optional Undervoltage Lockout; (9)Available in 16-Pin SO and SSOP Packages.

Diagrams

LT1719CS8#TR circuit diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LT1725CGN#TR
LT1725CGN#TR


IC REG CTRLR FLYBK ISO CM 16SSOP

Data Sheet

0-2500: $1.91
LT1725CGN#TRPBF
LT1725CGN#TRPBF


IC REG CTRLR FLYBK ISO CM 16SSOP

Data Sheet

0-2500: $1.87