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STR-W6735 Quasi-Resonant Topology Primary Switching Regulators
Features and Benefits
▪ Quasi-resonant topology IC ⇒ Low EMI noise and soft switching ▪ Bottom-skip operation ⇒ Improved system efficiency over the entire output load by avoiding increase of switching frequency ▪ Standby burst mode operation ⇒ Lowers input power at very light output load condition ▪ Avalanche-guaranteed MOSFET ⇒Improves systemlevel reliability and does not require VDSS derating ▪ 500 V / 0.57 Ω, 160 W (120 Vac input)

Description
The STR-W6735 is a quasi-resonant topology IC designed for SMPS applications. It shows lower EMI noise characteristics than conventional PWM solutions, especially at greater than 2 MHz. It also provides a soft-switching operation to turn on the internal MOSFET at close to zerovoltage (VDS bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor. The package is a fully molded TO-220, which contains the controller chip (MIC) and MOSFET, enabling output power up to 160 W with a 120 Vac input. The bottom-skip function skips the first bottom of VDS and turns on the MOSFET at the second bottom point, to minimize an increase ofoperational frequency at light output load, improving system-level efficiency over the entire load range. There are two standby functions available to reduce the input power under very light load conditions. The first is an auto-burst mode operation that is internally triggered by periodic sensing, and the other is a manual standby mode, which is executed by clamping the secondary output. In generalapplications, the manual standby mode reduces the input power further compared to the auto-burst mode. The soft-start function minimizes surge voltage and reduces power stress to the MOSFET and to the secondary rectifying
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Package: 6-pin TO-220

Typical Application
+B ErrAmp P

A

S1

GND Standby ON/OFF LowB S2

D
1 4

VCCD

STR-W6735

B

SI

Standby Out GND

Cont
6

FB
3 7 5

S/GND

RX

OCP /BD

SS /OLP

A B

For ErrAmp, Sanken SE series device recommended For SI, Sanken linear regulator IC recommended

CX

ROCP

28103.30-5

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

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 systemlevel reliability.Applications include the following: ▪ ▪ ▪ ▪ Set Top Box LCD PC monitor, LCD TV Printer, Scanner SMPS power supplies

Selection Guide
Part Number
STR-W6735

Package
TO-220

Packing
Bulk, 100 pieces

Absolute Maximum Ratings at TA = 25°C
Parameter Drain Current1 Maximum Switching Current2 Single Pulse Avalanche Energy3 Input Voltage for Controller (MIC) SS/OLP Terminal Voltage FBTerminal Inflow Current FB Terminal Voltage OCP/BD Terminal Voltage MOSFET Power Dissipation4 Symbol IDpeak IDmax EAS VCC VSSOLP IFB VFB VOCPBD PD1 Terminal Conditions 1 - 3 Single pulse 1 - 3 TA = –20°C to 125°C Single pulse, VDD = 99 V, L = 20 mH, 1-3 ILpeak = 5.8 A 4-3 5-3 6-3 6 - 3 IFB within the limits of IFB 7-3 With infinite heatsink 1-3 Without heatsink 4 - 3 VCC × ICC – Refer to TOP – – –Rating 20 20 380 35 –0.5 to 6.0 10 –0.5 to 9.0 –1.5 to 5.0 28.7 1.3 0.8 –20 to 115 –20 to 115 –40 to 125 150 Unit A A mJ V V mA V V W W W °C °C °C °C

Controller (MIC) Power Dissipation PD2 Operating Internal Leadframe Temperature TF Operating Ambient Temperature TOP Storage Temperature Tstg Junction Temperature TJ 1Refer to figure 2 2I DMAX is the drain current determined by the drive voltage of...