Datasheet > AP3983BCD

AP3983BCD

更新时间： 2022-02-26 09:31:37

品牌	Logo	应用领域
美台 - DIODES		/
页数	文件大小	规格书
13页	598K
描述
HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS

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数据手册

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AP3983BCD 数据手册

AP3983B/C/D

Operation Description

V_S

V_BULK

V_O

V_IN

C_O

I_OUT

L_MN_P

N_S

AP3983B/C/D

V_AUX

N_AUX

R_FB1

GND

CPC

R_FB2

R_CS

C_CPC

Figure 1. Simplified Flyback Converter Controlled by AP3983B/C/D

Constant Primary Peak Current

The primary i_P(t) current is sensed by a current sense resistor R_CSas shown in Figure 1.

The current rises up linearly at a rate of:

di_P(t) V_BULK(t)

……… (1)



L_M

See equation 2

I_PK

i_P(t)

Figure 2. Primary Current Waveform

As illustrated in Figure 2, when the current i_P(t) rises up to I_PK, the switch Q1 turns off. The constant peak current is given by:

V_CS

………(2)

I_PK



R_CS

The energy stored in the magnetizing inductance L_Meach cycle is therefore:

²………(3)

 L_M I_PK

E_G



So the power transferring from input to output is given by:

P  L_MI_PK² f_SW

………(4)

Where f_SWis the switching frequency. When the peak current I_PKis constant, the output power depends on the switching frequency f_SW

Constant Voltage Operation

The AP3983B/C/D captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to regulate the output

voltage. Assuming the secondary winding is master, the auxiliary winding is slave during the D1 on-time. The auxiliary voltage is given by:

6 of 13

www.diodes.com

July 2016

AP3983B/C/D

Document number: DS36784 Rev. 4 - 2

1...3 4 567 8 9...13

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