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EM5303

CYStech Electronics
Part Number EM5303
Manufacturer CYStech Electronics
Description 5V 12V Synchronous Buck PWM Controller
Published May 28, 2014
Detailed Description CYStech Electronics Corp. Spec. No. : C551QP Issued Date : 2010.10.25 Revised Date : Page No. : 1/12 5V/12V Synchronou...
Datasheet PDF File EM5303 PDF File

EM5303
EM5303

Overview
CYStech Electronics Corp.
Spec.
No.
: C551QP Issued Date : 2010.
10.
25 Revised Date : Page No.
: 1/12 5V/12V Synchronous Buck PWM Controller EM5303/A General Description EM5303/A is a synchronous rectified PWM controller operating with 5V or 12V supply voltage.
This device operates at 200/300 kHz and provides an optimal level of integration to reduce size and cost of the power supply.
This part includes internal soft start, internal compensation networks, over current protection, under voltage protection, and shutdown function.
This part is available in PSOP-8 package.
Features z z z z z z z z z z z Operate from 5V to 12V Voltage Supply 0.
6V VREF with 1.
5% Accuracy Voltage Mode PWM Control 200kHz or 300kHz Fixed Frequency Oscillator 0% to 80% Duty Cycle Internal Soft Start Over Current Protection Integrated Bootstrap Diode Adaptive Non-Overlapping Gate Driver Under Voltage Protection Over Voltage Protection Applications z z z Notebook & Netbook Graphic Cards & MB Low Voltage Logic Supplies Ordering Information Part Number EM5303QP EM5303AQP Package PSOP-8 PSOP-8 Frequency 200kHz 300kHz EM5303QP CYStek Product Specification http://www.
Datasheet4U.
com CYStech Electronics Corp.
Pin Configuration Spec.
No.
: C551QP Issued Date : 2010.
10.
25 Revised Date : Page No.
: 2/12 Typical Application Circuit Pin Assignment Pin Pin No.
Name BOOT 1 Pin Function Bootstrap Supply for the floating upper gate driver.
Connect the bootstrap capacitor C BOOT between BOOT pin and the PHASE pin to form a bootstrap circuit.
The bootstrap capacitor provides the charge to turn on the upper MOSFET.
Typical values for C BOOT range from 0.
1uF to 0.
47uF.
Ensure that C BOOT is placed near the IC.
Upper Gate Driver Output.
Connect this pin to the gate of upper MOSFET.
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off.
Signal and Power Ground for the IC.
All voltages levels are measured with respect to this pin.
Tie th...


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