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参数资料
| 型号： | 5962-8869701VA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, CDIP18 |
| 封装： | CERAMIC, DIP-18 |
| 文件页数： | 2/16页 |
| 文件大小： | 425K |
| 代理商： | 5962-8869701VA |
OV and UV Comparators Maintain Accurate Thresholds
6.4V
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q13
Q14
Q15
Q16 Q17
Q18
OVCOMPARATOR
UVCOMPARATOR
SENSE1
2kW
R1
Z1
5.7V
D1
SENSE2
SENSE3
SENSE4
100 A
m
6.4V
50 A
m
TOUV
THRESHOLD
VOLTAGE
OV
HYSTERESIS
CONTROL
6.4V
60 A
m
Q20
Q19
1.8V
TOOV
THRESHOLD
VOLTAGE
UV
HYSTERESIS
CONTROL
6.4V
60 A
m
1.8V
EXT.
OVDELAY
CAPACITOR
OVFAULT
INDICATION
TOOUTPUT
LOGIC
V
EXT.
UVDELAY
CAPACITOR
REF
UVFAULT
INDICATION
TOOUTPUT
LOGIC
Start Latch and Supply Under-Voltage Sense Allow Predictable Power-Up
SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com
The structure of the OV and UV comparators, shown in Figure 8 results in accurate fault thresholds even in the
case where multiple sense inputs cross a fault threshold simultaneously. Unused sense inputs can be tied either
to the 2.5-V reference, or to another, utilized, sense input. The four under- and over-voltage sense inputs on the
UC1903 are clamped as detailed on the Sense 1 input in Figure 8. The series 2-k
resistor, R1, and zener diode
Z1, prevent extreme under- and over-voltage conditions from inverting the outputs of the fault comparators. A
parasitic diode, D1, is present at the inputs as well. Under normal operation it is advisable to insure that voltage
levels at all of the sense inputs stay above –0.3 V. The same type of input protection exists at the line sense
input, Pin 15, except a 5-k
series resistor is used.
The fault delay circuitry on the UC1903 is also shown in Figure 8. In the case of an over-voltage condition at one
of the sense inputs Q20 is turned off, allowing the internal 60-mA current source to charge the user-selected
delay capacitor. When the capacitor voltage reaches 1.8 V, the OV and POWER OK outputs become active low.
When the fault condition goes away Q20 is turned back on, rapidly discharging the delay capacitor. Operation of
the under- voltage delay is, with appropriate substitutions, the same.
A.
The OV and UV comparators on the UC1903 trigger respective fault delay circuits when one or more of the sense
inputs move outside the fault window. Input clamps insure proper operation under extreme fault conditions.
Terminating the UV delay capacitor to VREF assures correct logic at power up.
Figure 8. OV and UV Comparators on the UC1903
At power-Up, while the +VIN input supply is below 3 V, all open collector outputs are off. With +VIN greater than 3
V the POWER OK output will be driven low and the UV OV FAULT outputs are disabled. Once +VIN rises above
the VSUV threshold of 7 V the fault outputs will be enabled. As would be expected, the SENSE 1-4 voltages at
power up may be below the UVFAULT window and the UVFAULT output may be driven low.
10
Copyright 1999–2008, Texas Instruments Incorporated
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