STR-W6252D

STR-W6252D Features and Benefits ▪ Overcurrent protection (OCP) with ac input voltage compensation function; no additional peripheral circuits required—minimizes dependency of OCP on ac input ▪ Overload protection (OLP) with integrated timer reduces power stress (temperature rise) at overload condition, requires no peripheral components ▪ Avalanche-guaranteed MOSFET improves device capability of withstanding excess surge voltage, providing a simple surge absorber circuit without breakdown voltage derating ▪ Start-up circuit eliminates the need for a start-up resistor, and helps to reduce input power consumption Continued on the next page… Description The STR-W6200D series are current-mode PWM ICs that incorporate controller chips. These devices are manufactured using a proprietary high-voltage BCD process, and avalancheguaranteed MOSFETs. These elements allow power supply systems designs that are highly reliable and simple, with fewer peripheral components. These ICs also provide Auto-Burst mode operation, which lowers input power requirements at light loads, and improves efficiency over the entire load range and universal-input range. Applicatons include: ▪ ▪ ▪ ▪ TV set top box LCD PC monitor, LCD TV Printer, scanner General consumer, PC, and industrial applications requiring SMPS power supply with standby mode Package: TO-220 Not to scale Functional Block Diagram VCC 7.1 V STARTUP UVLO 15.5 V/ 8.9 V 7.1 V D/ST REG VREG 28.5 V OVP ELP TSD RST R SQ =1.6 mA I startup DMAX 75% RQ S DRV PWM OSC SQ R S2 Q FM/ELP Frequency Modulation 12 V 7.8 V OLP CK S1 tOLP = tFM ×32 R OCP Drain Peak Current Compensation 160 μA FB Slope Compensation Feedback Control LEB S/OCP GND 28103.52 STR-W6252D Features and Benefits (continued) ▪ Bias Assist function improves start-up performance by selfbiasing the VCC pin, and allows a use of a small value VCC capacitor, resulting in improved response to overvoltage conditions ▪ Very low current consumption in nonoperating (UVLO) state: ICC(off) = 5 μA (typical) at VCC = 13.8 V ▪ Slope compensation circuit stabilizes operation, preventing interference from subharmonics ▪ Leading Edge Blanking ▪ Various protections:
• Overcurrent Protection (OCP), pulse-by-pulse sensing
• Overload Protection (OLP), auto restart after certain duration
• External Latch Protection (ELP), latched
• Overvoltage Protection (OVP), latched
• Thermal Shut Down (TSD), latched ▪ Externally-activated shut down protection (ELP) for emergency system shut down ▪ Auto-Burst Standby function (pin < 0.1 W at zero output load condition) ▪ Audible noise reducing function in Standby mode ▪ TO-220 full-molded package with 6 pins Selection Guide Part Number STRW6252D Packing 50 pieces per tube Pin-out Diagram T [...]