LTC1698IGNTRPBF Linear Technology Corporation, LTC1698IGNTRPBF Datasheet

LTC1698IGNTRPBF

Manufacturer Part Number

LTC1698IGNTRPBF

Description

SSOP16

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1698IGNTRPBF.pdf (24 pages)

Specifications of LTC1698IGNTRPBF

Date_code

05+

Current page: 1 of 24
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FEATURES

APPLICATIO S

TYPICAL APPLICATIO

High Efficiency Over Wide Load Current Range

Dual N-Channel MOSFET Synchronous Drivers

Pulse Transformer Synchronization

Optocoupler Feedback Driver

Programmable Current Limit Protection

Adjustable Overvoltage Fault Protection

Power Good Flag

Auxiliary 3.3V Logic Supply

Available in 16-Lead SSOP and SO Packages

48V Input Isolated DC/DC Converters

Isolated Telecommunication Power Systems

Distributed Power Step-Down Converters

Industrial Control Systems

Automotive and Heavy Equipment

0.8% Output Voltage Accuracy

5% Margin Output Voltage Adjustment

36V to 72V

TG BG

LT3781

–

Figure 1. Simplified 2-Transistor Isolated Forward Converter

REF

PRISEN

BOUNDARY

ISOLATION

SECSEN

SYNC

BIAS

SYNC

PLEASE REFER TO FIGURE 12 IN THE TYPICAL APPLICATIONS

SECTION FOR THE COMPLETE 3.3V/15A APPLICATION SCHEMATIC

Synchronous Rectifier Controller

SYNC

OPTODRV

SNS

SNSGND

DESCRIPTIO

The LTC

converter controller that synchronously drives external

N-channel MOSFETs. It is designed for use with the

controller to create a completely isolated power supply.

The LT3781 synchronizes the LTC1698 through a small

pulse transformer and the LTC1698 drives a feedback

optocoupler to close the feedback loop. Output accuracy

of 0.8% and high efficiency over a wide range of load

currents are obtained.

The LTC1698 provides accurate secondary-side current

limit using an external current sense resistor. The input

voltage at the MARGIN pin provides 5% output voltage

adjustment. A power good flag and overvoltage input are

provided to ensure proper power supply conditions. An

auxiliary 3.3V logic supply is included that supplies up to

10mA of output current.

PGND

OUT

, LTC and LT are registered trademarks of Linear Technology Corporation.

LTC1698

3781 primary-side synchronous forward converter

PWRGD

MARGIN

GND

OVPIN

COMP

AUX

1698 is a precision secondary-side forward

CILM

1681 F01

MARGIN

O.1 F

Isolated Secondary

CILM

3.3V

10mA

AUX

OUT

LTC1698

1698f

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