Datasheet > PFE850-12-054RA

PFE850-12-054RA

更新时间： 2022-02-26 11:23:13

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BEL		/
页数	文件大小	规格书
25页	1594K
描述
850W AC-DC FRONT-END POWER SUPPLY

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PFE850-12-054RA 数据手册

PFE850-12-054xA

5.1 OUTPUT VOLTAGE RIPPLE

Internal capacitance at the 12 V output (behind the OR-ing circuitry) is minimized to prevent disturbances during hot plug. In

order to provide low output ripple voltage in the application, external capacitors should be added close to the power supply

output.

The setup of Figure 6 has been used to evaluate suitable capacitor types. The capacitor combinations of Table 1 and Table 2

should be used to reduce the output ripple voltage. The ripple voltage is measured with 20 MHz BWL, close to the external

capacitors.

V₁

PGND

V_SB

Connection board

Figure 6. Output ripple test setup

NOTE:

Care must be taken when using ceramic capacitors with a total capacitance of 1 µF to 50 µF on output V₁, due to their high

quality factor the output ripple voltage may be increased in certain frequency ranges due to resonance effects.

External capacitor V1

2Pcs 47 µF/16 V/X5R/1210

1Pcs 1000 µF/16 V/Low ESR

Aluminum/ø10x20

1Pcs 270 µF/16 V/Conductive

Polymer/ø8x12

2Pcs 47 µF/16 V/X5R/1210 plus

1Pcs 270 µF Conductive Polymer OR

1Pcs 1000 µF Low ESR AlCap

dV1max

150

Unit

mVpp

External capacitor VSB

1Pcs 10 µF/16 V/X5R/1206

2Pcs 10 µ/F16 V/X5R/1206

1Pcs 47 µF/16 V/X5R/1210

2Pcs 100 µF/6.3 V/X5R/1206

dV1max

Unit

mVpp

120

mVpp

Table 1. Suitable Capacitors for V1

Table 2. Suitable Capacitors for VSB

The output ripple voltage on V_SBis influenced by the main output V₁. Evaluating V_SBoutput ripple must be done when maximum

load is applied to V₁.

Figure 7. Turn-On AC Line 230VAC, full load (200ms/div)

CH1: V₁(2V/div) CH2: V_SB(2V/div) CH3: Vin (200V/div)

Figure 8. Turn-On AC Line 230VAC, full load (5ms/div)

CH1: V₁(2V/div) CH2: V_SB(2V/div) CH3: Vin (200V/div)

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