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ADP1108AN-12 데이터시트(PDF) 11 Page - Analog Devices

부품명 ADP1108AN-12
상세설명  Micropower DC-DC Converter Adjustable and Fixed 3.3 V, 5 V, 12 V
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ADP1108
–11–
REV. 0
PROGRAMMING THE GAIN BLOCK
The gain block of the ADP1108 can be used as a low battery de-
tector, error amplifier or linear post regulator. The gain block
consists of an op amp with PNP inputs and an open-collector
NPN output. The inverting input is internally connected to the
ADP1108’s 1.245 V reference, while the noninverting input is
available at the SET Pin. The NPN output transistor will sink
about 300
µA.
Figure 24a shows the gain block configured as a low-battery
monitor. Resistors R1 and R2 should be set to high values to re-
duce quiescent current, but not so high that bias current in the
SET input causes large errors. A value of 33 k
for R2 is a good
compromise.
The value for R1 is then calculated from the formula:
R1
=
V
LOBATT – 1.245 V
1.245 V
R2


where VLOBATT is the desired low battery trip point. Since the
gain block output is an open-collector NPN, a pull-up resistor
should be connected to the positive logic power supply.
2
VIN
+5V
GND
ADP1108
R1
AO
SET
5
R2
33k
47k
TO
PROCESSOR
6
1.245V
REF
7
VBAT
VLB –1.245V
37.7µA
VLB = BATTERY TRIP POINT
R1 =
Figure 24a. Setting the Low Battery Detector Trip Point
The circuit of Figure 24a may produce multiple pulses when ap-
proaching the trip point, due to noise coupled into the SET in-
put. To prevent multiple interrupts to the digital logic, hysteresis
can be added to the circuit (Figure 24b). Resistor R3, with a
value of 1 M
to 10 M , provides the hysteresis. The addition
of R3 will change the trip point slightly, so the new value for R1
will be:
R1
=
V
LOBATT – 1.245 V
1.245 V
R2


V
L – 1.245 V
R
L + R3


where VL is the logic power supply voltage, RL is the pull-up
resistor and R3 creates the hysteresis.
2
VIN
+5V
GND
ADP1108
R1
AO
SET
5
R2
33k
47k
TO
PROCESSOR
6
1.245V
REF
7
VBAT
R3
1.6M
Figure 24b. Adding Hysteresis to the Low Battery Detector
L1*
100 H
5VOUT
200mA AT 6.5V
500mA AT 8V
100
0.22
ZETEX
ZTX749
*L1 = COILTRONICS CTX100-4
100
5
8
2
ILIM
VIN
SW1
SW2
GND
ADP1108-5
D1
1N5818
C2
VIN
6.5V TO 20V
3
C1
220
1
4
SENSE
Figure 25. 6.5 V to 5 V Step-Down Converter
ILIM
VIN
SW1
ADP1108-5
L1*
300µH
220
SENSE
SW2
GND
4
5
1
2
3
8
*L1 = COILTRONICS CTX300-4
–5V OUTPUT
150mA
+
C2
VIN
6.5V TO 20V
MBRS130T3
+
330µF
Figure 26. Positive to –5 V Converter


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