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BM2P094F-GE2 Datasheet(PDF) 8 Page - Rohm

Part # BM2P094F-GE2
Description  PWM type DC/DC converter IC
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BM2P094F-GE2 Datasheet(HTML) 8 Page - Rohm

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Datasheet
Datasheet
BM2PXX4F Series
TSZ02201-0F2F0A200080-1-2
24. Sep.2015.Rev.008
© 2012 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
(3) VCC pin protection function
BM2PXX4F built in VCC low voltage protection function VCCUVLO (Under Voltage Lock Out), over voltage protection
function VCC OVP (Over Voltage Protection) and VCC charge function that operates in case of dropping the VCC voltage.
VCC UVLO and VCC OVP monitor VCC pin and prevent VCC pin from destroying switching MOSFET at abnormal
voltage.
VCC charge function stabilizes the secondary output voltage by charging from the high voltage line by start circuit at
dropping the VCC voltage.
(3-1) VCC UVLO / VCC OVP function
V CCUVLO is auto recovery protection. VCCOVP is auto recovery protection. And they have voltage hysteresis. Refer to
the operation figure-8.
Switching is stopped by the VCCOVP function when VCC pin voltage > Vovp1 (typ=27.5V), and Switching is restart when
VCC pin voltage < Vovp2 (typ=23.5V)
Figure 8. VCC UVLO / OVP Timing Chart
A: DRAIN voltage input, VCC pin voltage starts rising.
B: VCC>Vuvlo1, DC/DC operation starts
C: VCC< VCHG1, VCC charge function operates and the VCC voltage rises.
D: VCC > VCHG2, VCC charge function is stopped.
E: VCC > VOVP1, continues TLATCH (typ =100us), switching is stopped by the VCCOVP function.
F: VCC < VOVP2, Switching operation restarts
G: VH is OPEN.VCC Voltage is fall.
H: Same as C.
I: Same as D.
J: VCC<Vuvlo2, Switching is stopped by the VCC UVLO function


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