BD8313HFN(2009) 查看數據表（PDF） - ROHM Semiconductor

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BD8313HFN
(Rev.:2009)

Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

ROHM Semiconductor 

BD8313HFN

20usec/Div

Vo u t( 2 0 m/ D iv)

出力リプル=2 4.4mVp- p

24.4mVpp

Fig.40 Output ripple 1

(VCC=12V, Io=40mA)

20usec/Div

Vout(20m/Div)

出力リプル=1 0.4mVp- p

10.4mVpp

Fig.43 Output ripple 4

(VCC=12V, Io=170mA)

20usec/Div

Vout(20m/Div)

出3力8.4リmプVルpp= 3 8 . 4 m Vp- p

Fig.41 Output ripple 2

(VCC=12V, Io=100mA)

20usec/Div

Vout(20m/Div)

出力リプル=14 .8mVp-p

14.8mVpp

Fig.44 Output ripple 5

(VCC=12V, Io=900mA)

Technical Note

20usec/Div

Vout(20m/Div)

出力リプル= 9.2mVp-p

9.2mVpp

Fig.42 Output ripple 3

(VCC=12V, Io=140mA)

Output ripple voltage

BD8313HFN is controlled by PWM(Pulse Width

0.75

SLOPE

Modulation)mode.

PWM output made by comparison SLOPE with FB(error amp

output) controls switching of IC under the PWM mode.

When FB level is completely lower than SLOPE level, DC/DC

FB

0.25

converter switches as non- synchronous step-down switching

mode not to make output voltage level drop quickly caused by

full ON state of Low side Nch FET.

Ripple voltage of output voltage in non-synchronous mode is

PWMoutput

larger than that in synchronous mode.

When voltage difference between input and output voltage is large and output current is small, DCDC converter switches as

this non-synchronous mode then ripple voltage of output voltage could be large.

In the reference data above ( output ripple 1 to 4 ), ripple voltage at 12V input 1.2V output , output current is smaller than

100mA is larger than other region.

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© 2009 ROHM Co., Ltd. All rights reserved.

11/17

2009.04- Rev.B

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