LB1920 Sanyo Semiconductor Corporation, LB1920 Datasheet
LB1920
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LB1920 Summary of contents
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... Ordering number : EN4949B Applications • Paper feed and drum motor drivers in FAX and PPC units Functions and Features • The LB1920 is an output current-improved version of the LB1824 • Three-phase bipolar brushless motor driver • Digital speed control • Thermal shutdown circuit • ...
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... V SHL [Oscillator] Output high level voltage V OH (CR) Output low level voltage V OL (CR) Oscillator frequency f (CR) Amplitude V (CR) [Current Limiter Operation] Limiter [Thermal Shutdown Operation] Thermal shutdown operating TSD temperature ∆TSD Hysteresis LB1920 Symbol Conditions FGS output output output O I FGS ...
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... IH (S/S) Input low level voltage V IL (S/S) Pull-down resistor R D (S/S) [Forward/reverse Pin] Input high level voltage V IH (F/R) Input low level voltage V IL (F/R) ∆V Hysteresis IN Pull-down resistor R D (F/R) Pin Assignment LB1920 Conditions I = – Gain: 100 kHz (FG (FGS min ...
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... F/R = low Source Sink IN1 1 OUT3 OUT2 H 2 OUT3 OUT1 H 3 OUT2 OUT1 H 4 OUT2 OUT3 L 5 OUT1 OUT3 L 6 OUT1 OUT2 L Note: Input high refers to the state where IN+ > IN–. LB1920 Function high F/R = high IN2 IN3 IN1 IN2 IN3 ...
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... The formula below gives the relationship between the oscillator frequency (f f (servo /(ECL divisor (16) number of counts) FC OSC = f /8192 OSC Crystal Oscillator External Circuit Equivalent Circuit Block Diagram LB1920 ) and the FG frequency (f OSC External Circuit Constants (reference values) X’tal (MHz) C1 (pF Note: However, the crystal used must have a fundamental frequency fo impedance to 3fo impedance ratio of 1:5 or greater ...
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... Sample Application Circuit AC Test Circuit Diagram LB1920 No. 4949-6/10 ...
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... The speed lock range is ±6.25% of the fixed speed and the LD pin goes low when the motor is in the lock range. (This pin is an open collector output.) When the motor speed goes out of the lock range, the LB1920 changes the motor drive output on duty according to the speed error to control the motor speed to be within the lock range. ...
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... PWM drive scheme and switches large currents in the output, noise can occur easily. Thus the power supply must be adequately stabilized so that this noise does not cause the IC to operate incorrectly. C1, C2 and C3 must be connected as close as possible to GND1. In particular, C1’s characteristics are easily influenced and thus requires caution. LB1920 = 10 mA mA) FGS No ...
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... Previously, when this was a problem, additional capacitors were used to resolve the problem. However, since the LB1920 resolves this problem at the circuit level, no additional external components are required. During switching, whiskers of less than about 10 ns can be observed on the RF voltage waveform, but these are not a problem ...
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... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provide information as of November, 1995. Specifications and information herein are subject to change without notice. LB1920 PS No. 4949-10/10 ...