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参数资料
| 型号： | 5962-88697012A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 15/16页 |
| 文件大小： | 425K |
| 代理商： | 5962-88697012A |
+VIN
75 A
m
UC1903
G.P.OP-AMP
OUTPUTSTAGE
D1
TOOP-AMP
INPUTSTAGE
Q6
Q5
Q4
Q1
Q2
Q3
R1
10kW
R2
15 W
R3
150 W
OUTPUT
150 A
m
R4
500 W
16
Sensing a Negative Voltage Level
Note: A similar scheme w/the G.P. op-amp will allow a sec-
ond negative supply to be monitored.
2.5V
R1
R2
VS
UC1903
SENSE4INPUT
SENSE4
INVERTER
GROUND
V (NOM)=2.5V
S
NEGATIVE
SUPPLY (-V )
S
SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com
Figure 4 demonstrates one of many auxiliary functions that the uncommitted op-amp on the UC1903 can be used
for. Alternatively, this op-amp can be used to buffer high impedance points, perform logic functions, or for
sensing and amplification. For example, the G.P. op-amp, combined with the 2.5-V reference, can be used to
produce and buffer an optically coupled feedback signal in isolated supplies with primary side control. The output
stage of this op-amp is detailed in Figure 5. The NPN emitter follower provides high source current capability.
≥20 mA while the substrate device, Q3, provides good transient sinking capability.
A.
The G.P. op-amp on the UC1903 has a high source current (20 mA) capability and enhanced transient sinking
capability through substrate device Q3.
Figure 5. The G.P. Op-Amp on the UC1903
The UC1903 has a dedicated inverter coupled to the sense 4 input. With this inverter, a negative voltage level
can be sensed as shown in Figure 6. The output of the inverter is an unbiased emitter follower. By tying the
inverting input, Pin 5, high the output emitter follower will be reverse biased, leaving the sense 4 input in a high
impedance state. In this manner, the sense 4 input can be used, as the remaining sense inputs would be, for
sensing positive voltage levels.
Figure 6. Inverting the Sense 4 Input for Monitoring a Negative Supply, Accommodated with the
Dedicated Inverter
8
Copyright 1999–2008, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 59628869701VA | 制造商:n/a 功能描述:UC1903J/883BC |
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| 5962-8869901XA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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