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APW7334 Datasheet(PDF) 5 Page - Anpec Electronics Coropration |
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APW7334 Datasheet(HTML) 5 Page - Anpec Electronics Coropration |
5 / 15 page Copyright © ANPEC Electronics Corp. Rev. A.2 - Dec., 2012 APW7334 www.anpec.com.tw 5 Pin Description PIN SOP-8 NAME FUNCTION 1 BS High-Side Gate Drive Boost Input. BS supplies the voltage to drive the high-side N-channel MOSFET. At least 10nF capacitor should be connected from LX to BS to supply the high side switch. 2 VIN Power Input. VIN supplies the power (4.5V to 24V) to the control circuitry, gate drivers and step-down converter switches. Connecting a ceramic bypass capacitor and a suitably large capacitor between VIN and GND eliminates switching noise and voltage ripple on the input to the IC. 3 LX Power Switching Output. LX is the Drain of the N-Channel power MOSFET to supply power to the output LC filter. 4 GND Ground. 5 FB Output feedback Input. The APW7334 senses the feedback voltage via FB and regulates the voltage at 0.8V. Connecting FB with a resistor-divider from the converter’s output sets the output voltage from 0.8V to 20V. 6 COMP Output of the error amplifier. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. 7 EN Enable Input. EN is a digital input that turns the regulator on or off. EN threshold is 2.5V with 0.2V hysteresis. Pull up with 100k Ω resistor for automatic startup. 8 SS Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1 µF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected. Block Diagram LX Gate Control V REF Fault Logics Error Amplifier FB Inhibit GND POR Power-On- Reset 5V UVLO Current Sense Amplifier EN COMP Oscillator 340kHz/ 110kHz Slope Compensation Current Compartor 1.5V Over Temperature Protection Current Limit Gate Driver Gate Driver Gm VIN 2.5/2.3V 1 BS 3 4 2 5 6 7 8 SS 5V VIN Internal Regulator 5V FB 0.6V Enable 120%V REF OVP 6 µA 5V OTP Current Sense Amplifier LOC LOC |
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