bd95710muv-e2 ROHM Co. Ltd., bd95710muv-e2 Datasheet - Page 7

• Manufacturer Part Number: bd95710muv-e2
• Description: 2phase Switching Regulator Controllers Graphic Card
• Manufacturer: ROHM Co. Ltd.

●Timing Chart
© 2009 ROHM Co., Ltd. All rights reserved.
BD95710MUV
www.rohm.com
・Soft Start Function
・Output Over Voltage Protection
・Short Circuit Protection with Timer Latch
VOUT
REFIN/EN
REFIN/EN or UVLO
SS
IIN
UG
SCP
LG
FB
FB
TSCP
T
SS
REFIN/EN x 0.5
switching
REFIN/EN x 1.3
7/20
When the FB pin voltage becomes REFIN/EN x 1.3, the
output over voltage protection is activated and Low side
MOSFET becomes ON to lower the output voltage
(LG=High, UG=Low). When the output voltage goes back
down to the specified level, the whole circuit becomes the
normal operation mode.
Short Circuit Protection kicks in when output falls to or
below REFIN/EN x 0.5. When the programmed time
period elapses, output is latched OFF to prevent
destruction of the IC. Output voltage can be restored
either by reconnecting the REFIN/EN pin (ON  OFF 
ON) or disabling UVLO (HIGH  Low  High).
Soft start is activated when REFIN/EN hits its enabling
threshold (VCC, 5VCC, and BUSEN have to be beyond
their own UVLO thresholds). Current control takes effect
at startup, enabling an output voltage “ramping start.”
Soft start timing and incoming current are calculated with
formulas (2) and below.
Soft start time (TSS) ≒ 3msec (fixed)
Incoming current
(Co: Output capacitor)
IIN=
Co×VOUT
3msec
[A] ・・・(2)
Technical Note
2009.04 - Rev.B