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G5201 Arkusz danych(PDF) 1 Page - Global Mixed-mode Technology Inc |
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G5201 Arkusz danych(HTML) 1 Page - Global Mixed-mode Technology Inc |
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1 / 1 page  Ver: 1.5 Jan 24, 2011 TEL: 886-3-5788833 http://www.gmt.com.tw 1 G5201 Global Mixed-mode Technology Inc. 5V/12V Input Voltage-Mode Buck PWM Controller Features Drives Two N-Channel MOSFETs Operates at 5V to 12V Supply Voltage Voltage-Mode PWM Control Fast Transient Response 0.8V, 2% Accuracy Reference Voltage Internal Soft Start Constant 300kHz Switching Frequency Over-Current Fault Monitors by Using Low-Side MOSFET RDS(ON) Output Under-Voltage Protection Applications High Power DC-DC Regulators Low-Voltage Distributed Power Supplies General Description The G5201 provides complete control and protection for a DC-DC converter for high power applications. It is designed to drive two N-channel MOSFETs in a syn- chronous-rectified buck topology. The G5201 inte- grates all of the control, and protection functions into a single package. The G5201 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 300kHz free-running triangle-wave oscilla- tor. The error amplifier features a 15MHz gain-band- width product which provides high converter band- width for fast transient performance. The resulting PWM duty ratio ranges from 0% to 80%. The refer- ence voltage is 0.8V, 2% accuracy. The G5201 has internal soft start and executes cy- cle-by-cycle current limit during soft start interval. The G5201 monitors the current by using the RDS(ON) of the low-side MOSFET which eliminates the need for a current sensing resistor. The under-voltage protection function monitors voltage at FB pin. The over-current and under-voltage events after soft-start interval trig- ger hiccup mode protection. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5201P11U G5201 -40°C~ +85°C SOP-8 Note: P1: SOP-8 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit GND 8 6 5 1 2 3 4 BOOT UGATE LGATE LX OCSET FB VCC SOP-8 G5201 7 BOOT SHDN UGATE 6µH OCSET FB LGATE GND VCC 5V~12V G5201 0.1µF 2000µF 10nF 10 Ω 4.7µF 220µF 68 Ω 32 Ω 3V~12V ROCSET LX VO=2.5V GND 8 6 5 1 2 3 4 BOOT UGATE LGATE LX OCSET FB VCC SOP-8 G5201 7 BOOT SHDN UGATE 6µH OCSET FB LGATE GND VCC 5V~12V G5201 0.1µF 2000µF 10nF 10 Ω 4.7µF 220µF 68 Ω 32 Ω 3V~12V ROCSET LX VO=2.5V |
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