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UC1717L883B Scheda tecnica(PDF) 3 Page - Texas Instruments |
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UC1717L883B Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 10 page Figure 1 Figure 3: Typical Sink Saturation Voltage vs Output Current Figure 2: Typical Source Saturation Voltage vs Output Current Figure 4: Typical Power Losses vs Output Current UC1717 UC2717 UC3717 Figure 5: Connections and Component Values as in Figure 6. The UC3717 drive circuit shown in the block diagram in- cludes the following functions: (1) Phase Logic and H-Bridge Output Stage (2) Voltage Divider with three Comparators for current control (3) Two Logic inputs for Digital current level select (4) Monostable for off time generation Input Logic: If any of the logic inputs are left open, the circuit will treat it as a high level input. Phase Input: The phase input terminal, pin 18, controls the direction of the current through the motor winding. The Schmidt-Trigger input coupled with a fixed time de- lay assures noise immunity and eliminates cross conduc- tion in the output stage during phase changes. A low level on the phase input will turn Q2 on and enable Q3 while a high level will turn Q1 on and enable Q4. (See Figure 7). Output Stage: The output stage consists of four Dar- lington transistors and associated diodes connected in an H-Bridge configuration. The diodes are needed to pro- vide a current path when the transistors are being switched. For fast recovery, Schottky diodes are used FUNCTIONAL DESCRIPTION across the source transistors. The Schottky diodes allow the current to circulate through the winding while the sink transistors are being switched off. The diodes across the sink transistors in conjunction with the Schottkys provide the path for the decaying current during phase reversal. (See Figure 7). PHASE INPUT Q1, Q4 Q2, Q3 Low Off On High On Off 3 |
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