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BM2P011 Datasheet(PDF) 7 Page - Rohm

Part # BM2P011
Description  PWM type DC/DC converter IC Included 650V MOSFET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BM2P011 Datasheet(HTML) 7 Page - Rohm

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Datasheet
Datasheet
BM2PXX1 Series
TSZ02201-0F2F0A200010-1-2
24.Sep.2015.Rev.005
© 2012 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
(2) Start sequences
(Soft start operation, light load operation, and auto recovery operation during overload protection)
Start sequences are shown in Figure 7. See the sections below for detailed descriptions.
Vout
Switing
VH
VCC(1pin)
FB(8pin)
Soft
Start
64ms
Iout
Normal Load
Light LOAD
Within
32ms
VCC=8.2V
Over Load
Internal REF
Pull Up
Burst mode
AB C
D
EF
GH
I
Switching
stop
VCC=13.5V
FB OLP ON
Figure 7. Start sequences Timing Chart
A: Input voltage VH is applied
B: This IC starts operation when VCC pin voltage rises and VCC > VUVLO1 (13.5 V typ).
Switching function starts when other protection functions are judged as normal. Until the secondary output voltage
becomes constant level, VCC voltage drops because of the VCC consumption current.
VCC recharge function start if VCC voltage < VCHG1 (8.7V typ)C : With the soft start function, over current limit value
is restricted to prevent any excessive rise in voltage or current.
D: When the switching operation starts, VOUT rises.
The output voltage become to stable state, VCC voltage also become to stable state through auxiliary winding.
Please set the rated voltage within the TFOLP1b period (32ms typ) from VCC voltage > VUVLO1.
E: During a light load, if it reaches FB voltage < VBST (= 0.4Vtyp), the IC starts burst operation to keep power consumption
low.
During burst operation, it becomes low-power consumption mode.
F : When the FB Voltage>VFOLP1A(=2.8V typ), it becomes a overload operation.
G: When FB pin voltage keeps V
FOLP1A (= 2.8V typ) at or above T FOLP (64ms typ), the overload protection function is triggered
and switching stops 64mS later. If the FB pin voltage becomes FB<V
FOLP1B even once, the IC’s FB OLP timer is reset.
H : If the VCC voltage drops to VCC < V
UVLO2 (7.7Vtyp) or below, restart is executed.
I: The IC’s circuit current is reduced and the VCC pin value rises. (Same as B)


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