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参数资料
| 型号： | LTC2914HDHC-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 5 X 3 MM, PLASTIC, MO-229WJED-1, DFN-16 |
| 文件页数： | 16/16页 |
| 文件大小： | 211K |
| 代理商： | LTC2914HDHC-1 |
LTC2914
9
2914fa
For positive supply monitoring, Vn is the desired nominal
operating voltage, In isthedesirednominalcurrentthrough
the resistive divider, VOV is the desired overvoltage trip
point and VUV is the desired undervoltage trip point.
For negative supply monitoring, to compensate for the 1V
reference, 1V must be subtracted from Vn, VOV and VUV
before using each in the following equations.
1. Choose RA to obtain the desired OV trip point
RA is chosen to set the desired trip point for the
overvoltage monitor.
RA =
0.5V
In
Vn
VOV
(1)
2. Choose RB to obtain the desired UV trip point
Once RA is known, RB is chosen to set the desired trip
point for the undervoltage monitor.
RB =
0.5V
In
Vn
VUV
–RA
(2)
3. Choose RC to Complete the Design
Once RA and RB are known, RC is determined by:
RC =
Vn
In
–RA –RB
(3)
If any of the variables Vn, In, VUV or VOV change, then each
step must be recalculated.
Positive Voltage Monitor Example
A positive voltage monitor application is shown in Figure 3.
The monitored voltage is a 5V ±10% supply. Nominal cur-
rent in the resistive divider is 10μA.
1. Find RA to set the OV trip point of the monitor.
RA =
0.5V
10A
5V
5.5V
45.3k
2. Find RB to set the UV trip point of the monitor.
RB =
0.5V
10A
5V
4.5V
– 45.3k 10.2k
3. Determine RC to complete the design.
RC =
5V
10A
– 45.3k 10.2k 442k
Negative Voltage Monitor Example
A negative voltage monitor application is shown in Figure 4.
The monitored voltage is a –5V ±10% supply. Nominal
current in the resistive divider is 10μA. For the negative
case, 1V is subtracted from Vn, VOV and VUV.
1. Find RA to set the OV trip point of the monitor.
RA =
0.5V
10A
–5V – 1V
–5.5V – 1V
46.4k
2. Find RB to set the UV trip point of the monitor.
RB =
0.5V
10A
5V – 1V
4.5V – 1V
46.4k 8.45k
3. Determine RC to complete the design.
RC =
–5V – 1V
10A
46.4k 8.45k 549k
Figure 3. Positive Supply Monitor
Figure 4. Negative Supply Monitor
APPLICATIONS INFORMATION
VH1
RC
442k
RB
10.2k
RA
45.3k
VCC
GND
LTC2914
VL1
2914 F03
OV
UV
SEL
VCC
5V
V1
5V ±10%
REF
RA
46.4k
RB
8.45k
RC
549k
VCC
GND
V3
–5V ±10%
LTC2914
VH3
VL3
2914 F04
OV
UV
SEL
VCC
5V
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