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| 型号： | LTC693CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISRY CIRCUIT 16SOIC |
| 标准包装： | 47 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
LTC692/LTC693
APPLICATIONS INFORMATION
V IN ≥ 7.5V
10μF
R1
51k
+
LT1086-5
V IN V OUT
ADJ
+
100μF
R3
300k
5V
0.1μF
R4
10k
V CC
PFO
LTC692
LTC693
PFI
GND
R2
10k
TO μP
692_3 ? F08
Figure 8. Monitoring Unregulated DC Supply with the
LTC692/LT693 Power-Fail Comparator
V IN ≥ 6.5V
+
10μF
LT1086-5
V IN V OUT
ADJ
+
10μF
5V
R1 R4
27k 10k
R3
0.1μF
V CC
LTC692
LTC693
2.7M
PFO
PFI
GND
R2
8.2k
TO μP
692_3 ? F09
R5
3.3k
Figure 9. Monitoring Regulated DC Supply with the
LTC692/LT693 Power-Fail Comparator
Example 1: The circuit in Figure 8 demonstrates the use
of the power-fail comparator to monitor the unregulated
R2 = 10.1k, Choose nearest 5% resistor 10k and recal-
culate V L ,
V L = 1.3V ? 1 +
powersupplyinput.Assumingthetherateofdecayofthe
supply input V IN is 100mV/ms and the total time to execute
a shutdown procedure is 8ms. Also, the noise of V IN is
?
?
51k
10 k
–
(5V – 1.3V)51 k ?
1.3V(310 k ) ? ?
= 7 . 32 V
V HYSTERESIS = 5V
= 850mV
= 8.151 V
V H = 1.3V ? 1 + +
= 10.7ms
200mV.Withtheseassumptionsinmind,wecanreason-
ably set V L = 7.25V which is 1.25V greater than the sum of
maximum reset voltage threshold and the dropout voltage
of LT ? 1086-5 (4.5V + 1.5V) and V HYSTERESIS = 850mV.
R1
R3
R3 ≈ 5.88 R1
Choose R3 = 300k and R1 = 51k. Also select R4 = 10k
which is much smaller than R3.
? 51k 51k ?
?
? 10k 300k ?
(7.32V – 6.25V)
100mV/ms
V HYSTERESIS = 8.151V – 7.32V = 831mV
The 10.7ms allows enough time to execute shutdown pro-
cedure for microprocessor and 831mV of hysteresis would
prevent PFO from going low due to the noise of V IN .
7.25V = 1. 3V ? 1+
1 . 3 V ( 310 k ) ? ?
?
?
51k (5V – 1.3V)51 k ?
–
R2
0692fb
13
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