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BM521Q25F Datasheet(PDF) 8 Page - Rohm

Part # BM521Q25F
Description  AC/DC controller IC for LED lighting Included 650V MOSFET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BM521Q25F Datasheet(HTML) 8 Page - Rohm

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BM521Q25F
(1.3) VCC Pin Protection Function
The VCC under voltage protection function VCC UVLO (Under Voltage Lock Out), over voltage protection function VCC
OVP (Over Voltage Protection), and a VCC recharge function which operates when a voltage drop occurs at VCC pin are
built in this IC. The VCC UVLO and VCC OVP functions are used for preventing the destructions of the switching MOSFET
which occurs when the VCC voltage is too high or too low.
Owing to the VCC charge function, the VCC pin is charged from high voltage lines by the start circuit when the VCC voltage
drops.
VCC UVLO / VCC OVP Function
VCC UVLO and VCC OVP are auto recovery comparators which have voltage hysteresis.
VCC OVP has a built-in mask time TLATCH(Typ=150
μs).
When the VCC voltage is over VOVP1(Typ=27.5V),and this state lasts TLATCH, the detection is executed.
Owing to this function, the surge which occurs at VCC pin can be masked.
VCC Charge Function
When the VCC pin voltage is over VUVLO1(Typ=13.5V), the IC starts up. In this case, if the VCC pin voltage drops below
VCHG1(Typ=8.7V), VCC charge function operates. At this time, the VCC pin is charged from the DRAIN pin through the
start-up circuit. Owing to this operation, the failure of start-up can be prevented.
VUVLO1 (Typ=13.5V)
ON
OFF
VOVP1 (Typ=27.5V)
Switching
VUVLO2 (Typ=8.2V)
VCC UVLO
Function
ON
OFF
OFF
VCC OVP
Function
ON
OFF
AB
C
OFF
Internal
Latch Signal
L : Normal
H : Latch
G
VLATCH (Typ=7.7V)
Time
VOVP2 (Typ=23.5V)
H
G I
ON
OFF
D
VCHG2 (Typ=13V)
VCHG1 (Typ=8.7V)
VCC RECHARGE
Function
ON
OFF
ON
OFF
ON
VSC (Typ=0.8V)
E
F
Istart2
(Typ=3mA)
Istart1
Istart2
ON
L
K
J
VCC(2)
Under TLATCH
(Typ=150us)
Over TLATCH
(Typ=150us)
Istart1
(Typ=550uA)
DRAIN(4)
A: DRAIN pin voltage is applied, VCC voltage rises by the charging current Istart1 (Typ=550
μA).
B: VCC voltage> VSC(Typ=0.8V), the charging current to VCC changes from Istart1 to Istart2(Typ=3mA)
C: VCC voltage> VCHG2(Typ=13V),though VCC charge function reacts, due to VCC UVLO is detected, the charge continues.
D: VCC voltage> VUVLO1, the VCC UVLO is released, and DC/DC operation starts, the charge to VCC stops.
E: VCC voltage< VCHG1, the charge to VCC restarts.
F: VCC voltage> VCHG2, VCC recharge function stops..
G: VCC voltage> VOVP1, VCC OVP is detected.
H: VCC voltage< VOVP2(Typ=23.5V), if VCC voltage drops below VOVP2 in TLATCH, VCC OVP is released, and the latch will
not be activated.
I: VCC voltage > VOVP2, if this state is kept longer than TLATCH, the switching stops by latch.
J: VCC voltage< VUVLO2(Typ=8.2V), VCC UVLO is detected.
K: VCC voltage< VLATCH(Typ=7.7V), the latch state is released.
L: VCC voltage< VSC, the charging current to VCC changes from Istart2 to Istart1.
Figure 9. Timing Chart of VCC UVLO/ VCC OVP / VCC Charge Function
8/16
TSZ02201-0F4F0C300090-1-2
20.Apr.2016 Rev.002
© 2016 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001


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