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UC1903 Datasheet(PDF) 8 Page - Texas Instruments |
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UC1903 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page +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 UC1903 UC2903 UC3903 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 Submit Documentation Feedback Copyright © 1999–2008, Texas Instruments Incorporated Product Folder Link(s): UC1903 UC2903 UC3903 |
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