bd3010afv-m ROHM Co. Ltd., bd3010afv-m Datasheet - Page 10

• Manufacturer Part Number: bd3010afv-m
• Description: Regulator With Voltage Detector And Watchdog Timer
• Manufacturer: ROHM Co. Ltd.

●WDT Voltage Detection (Resistance Value is TYP. value)
© 2010 ROHM Co., Ltd. All rights reserved.
BD3010AFV-M
www.rohm.com
※If the OUT-WADJ resistance value is not same as the condition on the electrical characteristics table, i.e., 5KΩ, choose
＜Timing Chart＞ Timing Chart from the no load condition (Stand-by Mode)
OUT
CLK
INH
Vcc
the resistance value in ratio referring to the above equation.
CT
Ro
Io
OUT
1.25V
1.15V
0.15V
13.5V
5mA
0mA
IoA
－
+
0V
0V
IC Internal Block Diagram
0V
5V
0V
0V
5V
0V
Stand-by mode
－
+
LOW
HIGH
140k Ω
WDT
WDT
OFF
ON
PowTr
WADJ
OUT
WADJ-R
(External R)
WDT can be automatically switched ON/OFF by the output load
current. To detect the output load current, add a resistor between
OUT-WADJ. Current detection is adjustable by selecting
1 kΩ ~ 15kΩ resistance.
Calculation:
Io
≧100mV
When there is no resistance between WADJ-OUT, Io=70µA can
be detected by the calculation below
Io
10/21
(
(Desired load current value)
Desired load current value
※1 is IC internal resistance between WADJ-OUT
(tolerance approx ±30%, temperature coefficient approx 2000ppm)
※2 is an offset of detection comparator (tolerance approx 100mV±10%)
※
2
)
x ΔI
x ΔI
(WADJ current mirror ratio
(WADJ current mirror ratio)
)
x
x 140kΩ≧100mV
(
external R/
Technical Note
2010.11- Rev.A
CT pull up voltage
Vth H
Vth L
140kΩ
※
1
)