LB1870 Sanyo Semiconductor Corporation, LB1870 Datasheet
LB1870
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LB1870 Summary of contents
Page 1
... Ordering number : EN4356A Overview The LB1870 and LB1870M are three-phase brushless motor driver ICs that are optimal for LBP and LBF polygon mirror motor drive. Functions and Features • Single-chip implementation of all circuits required for LBP polygon mirror motor drive (speed control and driver circuits) • ...
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... OL [FG Schmitt block] Input hysteresis (high to low) V SHL Input hysteresis (low to high) V SLH Hysteresis V FGL Input operating level V FGSIL Output saturation voltage V (sat) FGS Output leakage current I (LEAK) V FGS LB1870, 1870M Symbol Conditions REG FGS FGS = Conditions Stop mode = 0 Ω 0 Ω ...
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... Input high level voltage V (S/S) IH Input low level voltage V (S/S) IL Input open voltage V (S/S) IO Hysteresis V (S/S) IS Input high level current I (S/S) IH Input low level current I (S/S) IL LB1870, 1870M Conditions Design target value No external load No external load No external load No external load REG REG Ω Ω ...
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... Pin Assignments (Top view) LB1870, 1870M (Top view) No. 4356-4/10 ...
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... FG OUT FG amplifier output – amplifier input AGC AGC amplifier frequency characteristics correction Equivalent Circuit Block Diagram LB1870, 1870M + – Taken as high when IN > and as low otherwise. Capacitors are inserted between these pins and ground. Output block ground. Connect to GND2. Ground for circuits other than the output block. ...
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... Clock Divisor Switching Pin N1 Pin N2 Divisor H H 2560 (5 1 512 5120 (5 2 512 4096 (4 2 512 3072 (3 2 512) — M EXT. CLK Note: An open input is taken as a high level input. PLL servo frequency = (crystal oscillator frequency)/(divisor) LB1870, 1870M Crystal Oscillator Usage No. 4356-6/10 ...
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... GND1 (pin 11 in the LB1870, pin 5 in the LB1870M) .........................................Output block ground (sub-ground) GND2 (pin 28 in the LB1870, pins 20, 35, and 36 in the LB1870M)..Control circuit ground. GND1 and GND2 should be connected on the circuit board by the shortest distance that occurs in the pattern. Also, ...
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... V Threshold level (high low): about 2.4 V The LB1870 goes to stop mode with this pin in the open state. • CLK input pin Input type: A pnp transistor whose base is pulled up to the internal 6.3 V power supply through a 23 kΩ resistor, and is pulled down to ground through a 40 kΩ ...
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... Oscillator pin A crystal oscillator and an RC circuit is connected to the LB1870’s OSC pin. To avoid problems when selecting the oscillator and the capacitor and resistor values, confirm these values with the oscillator’s manufacturer. The pnp transistor and resistor circuit shown in the figure can be used to apply an external signal (of a few MHz) to the OSC pin ...
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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 provides information as of July, 1998. Specifications and information herein are subject to change without notice. LB1870, 1870M = –1 mA, about –1.9 mV/°C, when the LD pin is high No. 4356-10/10 ...