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NJM3774 Datasheet(PDF) 3 Page - New Japan Radio |
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NJM3774 Datasheet(HTML) 3 Page - New Japan Radio |
3 / 9 page NJM3774 Figure 3. Output stage with current paths during turn-on, turn-off and phase shift. s FUNCTIONAL DESCRIPTION Each channel of the NJM3774 consists of the following sections: an output H-bridge with four transistors, capable of driving up to 1000mA continuous current to the motor winding; a logic section that controls the output transistors; an S-R flip-flop; and a comparator. The clock-oscillator is common to both channels. Constant current control is achieved by switching the output current to the windings. This is done by sensing the peak current through the winding via a resistor, R S, effectively connected in series with the motor winding during the turn-on period. As the current increases, a voltage develops across the resistor, and is fed back to the comparator. At the predetermined level defined by the voltage at the reference input V R, the comparator resets the flip-flop, turning off the output transistors. The current decreases until the clock oscillator triggers the flip-flop, turning on the output transistors, and the cycle is repeated. The current paths during turn-on, turn-off and phase shift are shown in figure 3. Note that the upper recirculation diodes are connected to the circuit externally. Fast Current Decay Slow Current Decay Motor Current Time 1 2 3 3 1 2 R S VMM External recirculation diodes |
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