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STR-W6735_V

Quasi-Resonant Topology Primary Switching Regulators

Allegro MicroSystems 

STR-W6735

Features and Benefits (continued)

▪ Various protections  Improved system-level reliability

▫ Pulse-by-pulse drain overcurrent limiting

▫ Overvoltage Protection (bias winding voltage sensing),

with latch

▫ Overload Protection with latch

▫ Maximum on-time limit

Selection Guide

Part Number

STR-W6735

Package

TO-220

Quasi-Resonant Topology

Primary Switching Regulators

Description (continued)

diodes during the start-up sequence. Various protections such as

overvoltage, overload, overcurrent, maximum on-time protections

and avalanche-energy-guaranteed MOSFET secure good system-

level reliability.

Applications include the following:

▪ Set Top Box

▪ LCD PC monitor, LCD TV

▪ Printer, Scanner

▪ SMPS power supplies

Packing

Bulk, 100 pieces

Absolute Maximum Ratings at TA = 25°C

Parameter

Symbol Terminal

Conditions

Rating

Unit

Drain Current1

Maximum Switching Current2

IDpeak

IDmax

1 - 3 Single pulse

1 - 3 TA = –20°C to 125°C

20

A

20

A

Single Pulse Avalanche Energy3

Input Voltage for Controller (MIC)

SS/OLP Terminal Voltage

EAS

VCC

VSSOLP

1-3

4-3

5-3

Single pulse, VDD = 99 V, L = 20 mH,

ILpeak = 5.8 A

380

mJ

35

V

–0.5 to 6.0 V

FB Terminal Inflow Current

IFB

6-3

10

mA

FB Terminal Voltage

VFB

6 - 3 IFB within the limits of IFB

–0.5 to 9.0 V

OCP/BD Terminal Voltage

MOSFET Power Dissipation4

VOCPBD

PD1

7-3

1-3

With infinite heatsink

Without heatsink

–1.5 to 5.0 V

28.7

W

1.3

W

Controller (MIC) Power Dissipation

PD2

4 - 3 VCC × ICC

0.8

W

Operating Internal Leadframe Temperature

TF

Operating Ambient Temperature

TOP

– Refer to TOP

–

–20 to 115 °C

–20 to 115 °C

Storage Temperature

Tstg

–

–40 to 125 °C

Channel Temperature

1Refer to figure 2

Tch

–

150

°C

2IDMAX is the drain current determined by the drive voltage of the IC and the threshold voltage, Vth, of the MOSFET

3Refer to figure 3

4Refer to figure 5

All performance characteristics given are typical values for circuit or

system baseline design only and are at the nominal operating voltage and

an ambient temperature of +25°C, unless otherwise stated.

28103.30-5

2

SANKEN ELECTRIC CO., LTD.

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