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BD28620MUV Datasheet(PDF) 40 Page - Rohm

Part # BD28620MUV
Description  Wide power supply voltage range
Download  49 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD28620MUV Datasheet(HTML) 40 Page - Rohm

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BD28620MUV
© 2014 ROHM Co., Ltd. All rights reserved.
16.Mar.2015 Rev.004
www.rohm.com
TSZ22111・15・001
TSZ02201-0C1C0E900100-1-2
(2) Snubber circuit constant
When overshoot/undershoot of PWM Output exceeds absolute maximum rating, or when overshoot/undershoot of
PWM output negatively affects EMC, or when ringing deteriorates the audio characteristic of the PWM output, snubber
circuit is used as shown below.
(a) Measure the spike resonance frequency “f1” of PWM output waveform (when rising) by using FET probe at the
OUT terminal. (Figure 73)
Shorten GND lead of FET probe and monitor as near as possible to output pin.
(b) Measure the resonance frequency “f2” of the spike as the snubber-circuit R value equals 0Ω
(capacitor “C” is connected to GND)
Adjust the value of the capacitor “C” until it becomes (2 x f2 = f1)
The value of “C” that becomes (2xf2=f1) is 3 times of the parasitic capacity “Cp” that a spike is formed. (C=3Cp)
(c) Parasitic inductance “Lp” is calculated using the next formula.
(d) The character impedance Z of resonance is calculated from the parasitic capacity “Cp” and the parasitic inductance
Lp using the next formula.
(e) Set snubber circuit “R” same as the character impedance “Z”.
Set snubber circuit “C” 4 to 10 times of the parasitic capacity “Cp”.
If “C” is set larger than 10Cp, switching current will possibly increase.
The following table shows ROHM recommended value of “Snubber filter constants” when using ROHM 4 layer board.
RL
C
R
680pF to 1200pF ,50V B(±10%)
5.6Ω,1/10W J(±5%)
680pF to 1200pF ,50V B(±10%)
5.6Ω,1/10W J(±5%)
680pF to 1200pF ,50V B(±10%)
5.6Ω,1/10W J(±5%)
Figure74. Snubber Schematic
Figure 73. PWM Output Waveform
Measure of Spike Resonance Frequency)
Spike resonance frequency
5nsec/div
Driver
GNDP
VCCP
R
C
Snubber
LCfilter
OUT
p
C
f
2
1
p
2
1
L
p
p
C
L
Z


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