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| 型号： | ADP1111ANZ-12 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV 12V .2A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 12V |
| 输入电压： | 2 V ~ 30 V |
| 频率 - 开关： | 72kHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
ADP1111
The circuit of Figure 27b may produce multiple pulses when
approaching the trip point due to noise coupled into the SET
input. To prevent multiple interrupts to the digital logic,
hysteresis can be added to the circuit (Figure 27). Resistor
RHYS, with a value of 1 M Ω to 10 M Ω , provides the hysteresis.
The addition of RHYS will change the trip point slightly, so the
9 V to 5 V Step-Down Converter
This circuit uses a 9 V battery to generate a +5 V output. The
circuit will work down to 6.5 V, supplying 50 mA at this lower
limit. Switch current is limited to around 500 mA by the 100 Ω
resistor.
R 1 =
? ? L
R 2 ? ?
? R L + R HYS ?
?
new value for R1 will be:
V LOBATT ? 1.25 V
? 1.25 V ? ? V ? 1.25 V ?
? ?
where V L is the logic power supply voltage, R L is the pull-up
resistor, and R HYS creates the hysteresis.
INPUT
9V
R LIM
100 Ω
1 2 3
I LIM V IN SW1
SW2 4
ADP1111-5
SENSE 8
AO SET GND
6 7 5
L1
CTX15-4
15 μ H
D1
1N5818
+
OUTPUT
(9V IN TO 5V @ 150mA,
6.5V IN TO 5V @ 50mA)
C L
22 μ F
5V
NC
NC
V BAT
33k
R1
R2
1.25V
REF
SET
V IN
ADP1111
AO
GND
1.6M
R L
47k
TO
PROCESSOR
Figure 29. 9 V to 5 V Step-Down Converter
20 V to 5 V Step-Down Converter
This circuit is similar to Figure 29, except it supplies much
higher output current and operates over a much wider range of
input voltage. As in the previous examples, switch current is
limited to 500 mA.
R HYS
Figure 27b.
12V TO 28V
INPUT
R LIM
100 Ω
1
2
3
L1
APPLICATION CIRCUITS
All Surface Mount 3 V to 5 V Step-Up Converter
I LIM V IN SW1
SW2 4
ADP1111-5
SENSE 8
CTX68-4
68 μ H
OUTPUT
(+5V @ 300mA)
This is the most basic application (along with the basic step-
down configuration to follow) of the ADP1111. It takes full
advantage of surface mount packaging for all the devices used in
the design. The circuit can provide +5 V at 100 mA of output
AO SET GND
6 7 5
NC
NC
D1
1N5818
+
C L
47 μ F
current and can be operated off of battery power for use in
portable equipment.
Figure 30. 20 V to 5 V Step-Down Converter
L1
D1
+5 V to –5 V Converter
INPUT +3V
R3*
(OPTIONAL)
1
2
20 μ H
CTX20-4
MBRS120T3
OUTPUT
(5V @ 100mA)
This circuit is essentially identical to Figure 22, except it uses a
fixed-output version of the ADP1111 to simplify the design
somewhat.
I LIM V IN
12V TO 25V
INPUT
SW1 3
ADP1111-5
SENSE 8
AO SET GND SW2
6 7 5 4
NC NC
+
C L
33 μ F
INPUT
R LIM
100 Ω
1 2 3
I LIM V IN SW1
SW2 4
ADP1111-5
SENSE 8
L1
CTX33-2
33 μ H
Figure 28. All Surface Mount +3 V to +5 V Step-Up Converter
AO SET GND
6 7 5
NC
NC
D1
1N5818
+
C L L
33 μ F
–5V
@ 75mA
Figure 31. +5 V to –5 V Converter
REV. 0 A
–13 –
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