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參數(shù)資料
| 型號： | L9935 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | TWO-PHASE STEPPER MOTOR DRIVER |
| 中文描述： | 兩相步進電機驅(qū)動器 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 159K |
| 代理商： | L9935 |
No current:
Bit 5, bit 4 (correspondingbit 2 and bit1 for bridge
B) both are HIGH, the current logic will inhibit all
drivers D
11
, D
12
, D
21
, D
22
turning off M
11
, M
12
,
M
21
, M
22
independentlyfrom the signal of the cur-
rent sense comparator comp 1.
Turning on:
Changing bit 5 or bit 4 or bothto LOWwill turn on
either M
11
and M
22
orM
21
and M
12
(dependingon
the phase signal bit 3). Current will start to flow
through the load. The current will be sensed by
the drop across R
1
.
The threshold of the comparator comp1 depends
on the current settings of bit 5 and bit 4.
The current will rise until it exceeds the turn off
thresholdof comp 1.
Chopping:
Exceeding the threshold of comp 1 the drive logic
will turn off the sink transistor (M
12
or M
22
). The
sink transistor periodically is turned on again by
the oscillator. Immediately after turning on M
12
or
M
22
the comparator comp 1 will be inhibited for a
certain time to blank switch over spikes caused
by capacitiveload componentsup to 5 nF.
Turning off for example M
12
will yield a flyback
current through D
11
. (So now the free wheeling
current flows through M21, the load and D11).
This leads to a slow current decay during flyback.
Maximum duty cycles of more than 85% (at f
OSC
= 25kHz) are possible. In this case current flows
of bothbridges will overlap(not shown in Fig. 5).
Reversing phase:
Suppose the current flowed via M
21
, the load and
M
12
before reversing phase. Reversing phase
M
21
and M
12
will be turned off. So now the cur-
rent will flow through D
22
, the load and D
11
. This
leads to a fast current decay.
Chopper control by oscillator
Both chopping circuits work with offset phase.
One chopper will switch on the bridge at the
maximum voltage of the oscillator while the other
chopper will switch on the bridge at minimum
voltage of the oscillator.
MS1 and MS2 blank switching spikes that could
lead to errors of the current control circuit.
SRA
SRB
OSC
C
OSC
MS1
MS2
Comp1
inhibit
+
inhibit
D99AT420
+
-
-
Comp2
Dr1
OSCILLATOR
Dr2
RES2
RES1
R
R
S
S
MOS DRIVERS
RESET
DOMINANT
RESET
DOMINANT
RSFF1
RSFF2
f
OSC
=
i
OSC
2.46V · C
OSC
Figure 4. Principalchopper control circuit.
L9935
7/19
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