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STRW6251

Allegro
Part Number STRW6251
Manufacturer Allegro
Description PWM Switching Regulator
Published Jan 1, 2021
Detailed Description STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators Features and Benefits ▪ Overcurrent protect...
Datasheet PDF File STRW6251 PDF File

STRW6251
STRW6251

Overview
STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators 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… Package: TO-220 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 Not to scale Functional Block Diagram VCC UVLO 15.
5 V/ 8.
9 V REG VREG PWM OSC DMAX 75% SQ R 28.
5 V OVP 7.
1 V ELP TSD 7.
1 V RST R SQ RQ S STARTUP Istartup =1.
6 mA DRV FM/ELP 12 V FB Frequency Modulation 7.
8 V 160 μA S2 Q OLP CK tOLP = S1 tFM×32 R Slope Compensation OCP Drain Peak Current Compensation Feedback Control LEB D/ST S/OCP GND 28103.
51 STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators Features and Benefits (continued) ▪ Bias Assist function improves start-up performance by self- biasing the VCC pin, and allows a us...


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