Datasheet > EPR-68

EPR-68

更新时间： 2024-09-17 03:34:39

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		开关
页数	文件大小	规格书
28页	2226K
描述
Engineering Prototype Report for EP 68 - 6.6 W DC-DC Flyback Converter Using DPA-Switch- (DPA423G)

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EP68 3.3 V, 2 A DC-DC Power Supply

19-Jul-2005

4 Circuit Description

The Flyback topology was used to minimize circuit board size, parts count and cost, while

attaining excellent operating efficiency across the input voltage range.

4.1 DPA-Switch Primary

The DPA423G IC provides PWM control, startup, feedback, under/over voltage and over-

temperature protection functions. The integrated 220 V MOSFET provides excellent

switching characteristics at the selected 400 kHz operating frequency. The MOSFET and

controller consume minimal power, enabling a typical operating efficiency of 74%-78%

across the operating input voltage range (see Figure 7).

R1 provides a 25 kΩ input impedance, consistent with PoE Class 0 requirements. Above

30 V, Zener VR1 conducts, allowing n-channel MOSFET Q1 to turn on. Zener diode VR2

protects the gate of Q1 from overvoltage damage. Resistors R2 and R3 provide

repeatable on and off timing.

Resistor R5 programs the typical input under-voltage ON threshold to 33 VDC. Resistors

R4 and R6 program the internal device current limit to reduce with increasing input

voltage. Maximum output (overload) current varies less than 5% across the operating

voltage range. The reduction in overload output current reduces secondary transformer

leakage spikes and allows the use of a 30 V Schottky diode, for the output rectifier D1.

The primary-side Zener clamp, VR3, provides protection of the DPA423G drain under

input surge and overvoltage conditions. Zener diode VR3 does not conduct under normal

operating conditions.

The primary bias winding provides CONTROL pin current after start-up. Diode D2

rectifies the bias winding, while components R8 and C11 reduce the high frequency

switching noise and reduce the peak charging of the bias voltage.

The DPA423G operates well within the recommended junction temperature limits

(100 °C) at an elevated ambient of 50 °C, in a free-convection cooled environment (see

Section 11).

4.2 Output Rectification

Schottky output diode D1 enables low-loss rectification of the secondary winding voltage.

Low ESR tantalum output capacitors, C7-9, reduce switching ripple and minimize losses.

Secondary output choke L1 and ceramic output capacitor C10 reduce high frequency

noise and ripple at the output.

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

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