- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376306 > REJ03F0052_M54679SP (Hitachi,Ltd.) 2-Phase Stepper Motor Driver PDF資料下載
參數(shù)資料
| 型號： | REJ03F0052_M54679SP |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 2-Phase Stepper Motor Driver |
| 中文描述： | 二相步進電機驅(qū)動器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 199K |
| 代理商： | REJ03F0052_M54679SP |
M54679SP
Rev.1.0, Sep.17.2003, page 6 of 11
(3) Equivalent circuit of Vref terminal.
The equivalent circuit of Vref terminal is shown in bellow circuit. As Vref terminal needs typical 500
μ
A input
current, consider this value when Vref voltage is set.
Vref
I0
I1
18K
2K
3.5K 0.68K
(4) Current sensing comparators.
The current sensing comparators compare the voltage (V
RS
) of current sensing resistor and threshold voltage (V
CH
) of
this comparators, then if V
RS
> V
CH
, the comparators output change and shut off the output.
(5) Oscillation circuit.
External capacitor (390 pF typ) is charged and discharged by the constant current and a triangular waveform (V
TH
(Fref
terminal high voltage) = 2.5 V, V
TL
(Fref terminal low voltage) = 0.5 V) appears to Fref terminal.
This triangular waveform is a carrier frequency of PWM circuit. The carrier frequency changes if this external
capacitor value is changed.
M54679SP is designed that the oscillation frequency is 30 kHz if the external capacitor value is 390 pF.
The oscillation frequency is in inverse proportion to the value of an external capacitor.
(6) Spike current cancellation.
Output power transistors go to ON, then the spike current appears on the R
S
(current sensing) in a short time and this is
caused by the internal delay time. M54679SP has the cancellation circuit of the spike current as the current sensing
comparators do not cause error functions.
So, the function of current sensing comparators is shut off during 2
μ
s since the output power transistors go to ON.
(7) Ph signal delay circuit.
M54679SP has a delay time of 3.0
μ
s until output H-bridge power stage go to ON since Ph signal change Low to high.
This delay time is enough short time for the frequency (plus rate) of Ph signal and there is no problem in the normal
function.
(8) Rs and S1 or S2 terminal.
If S1 or S2 terminal (non-inverted input of the current sensing comparators) is connected the nearest position of current
sensing resistor, the error of the current sensing by means of wire resistance on the board will be decreased.
(9) Voltage stabilizer.
M54679SP has a voltage stabilizer of 3.5 V. The reference voltage (Vref) can connect the output (Regout) of voltage
stabilizer directly. In this case, the current capability of the output of voltage stabilizer is 1.0 mA (source current), 0.1
mA (sink current).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| REJ03F0059_M61533FP | LEAD FREE EXT TEMP A6841 SOIC-20 |
| RF-HDT-DVBE-N0_07 | 13.56-MHz ENCAPSULATED STANDARD TRANSPONDER |
| RF142 | Heterojunction Bipolar Transistor Power Amplifier Dual-Band Controller for GSM and PCS Applications |
| RF212 | Image-Reject Front End for Dual or Tri-Band GSM Applications |
| RF212-11 | Image-Reject Front End for Dual or Tri-Band GSM Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REJ03F0057_M61520FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:6ch Electronic Volume with Tone Control |
| REJ03F0059_M61533FP | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4ch Electronic Volume with AGC |
| REJ03F0087-0100Z | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RF Transceiver for Short-range Wireless |
| REJ10B0089_SH7058 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SH7058 Group FP-256H User System Interface Board |
| REJF00310070 | 制造商:SHIELD 制造商全稱:SHIELD s.r.l. 功能描述:M8, field attachable, angled |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。