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APPLICATION NOTE  529

15V Input Converter Generates -185V at 50mA

Additional Information: Figure 1. This circuit uses the MAX668 and a transformer (which will need about a one-to-six turns ratio) to make a flyback converter. The op amp inverts the feedback from the negative output voltage.
Figure 1. This circuit uses the MAX668 and a transformer (which will need about a one-to-six turns ratio) to make a flyback converter. The op amp inverts the feedback from the negative output voltage.

The circuit above generates -185V at 50mA from a +15V input. Based on a MAX668 transformer flyback application, the circuit employs a custom transformer to generate -185V through a combination of turns ratio and duty cycle. The transformer is designed on an SG5-size bobbin to facilitate the winding and to decrease the leakage inductance.

D2 is chosen as a fast-recovery diode to moderate the cost for a high-breakdown voltage part. Because the diode will see 185V + (6 x Vin) + flyback due to leakage inductance, a 600V rating is necessary. C3 is chosen as a film capacitor to get high voltage rating and high ripple-current capacity. A secondary LC (L1 and C8) reduces output ripple from 100mVp-p to less than 5mVp-p.


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추가 정보  APP 529: Nov 01, 2000
MAX4130 1채널/2채널/4채널, 대역폭, 저전력, 단일 전원 Rail-to-Rail I/O Op 앰프 전체 데이터 시트
(PDF, 424kB)
무료 샘플
MAX668 1.8V ~ 28V 입력, µMAX 패키지로 제공되는 PWM 스텝 업 컨트롤러 전체 데이터 시트
(PDF, 304kB)
무료 샘플
 

다운로드, PDF 형식다운로드, PDF 형식 (30kB)
 AN529, AN 529, APP529, Appnote529, Appnote 529



         



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