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參數(shù)資料
| 型號(hào)： | L295 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL SWITCH-MODE SOLENOID DRIVER |
| 中文描述： | 雙開關(guān)模式電磁驅(qū)動(dòng) |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 112K |
| 代理商： | L295 |
If the oscillator pin (9) is connected to ground the
load current falls to zero as shown in fig. 1.
At this time t
2
the channel 1 is disabled, by taking
the inputs V
in1
low and/or EN high, and the output
transistor Q2 is turned off. The load current flows
through D2 and D1 according to the law:
I
=
(
V
B
R
1
+
I
T2
)
e
R1
t
L1
V
B
R1
where V
B
= V
S
+ V
D1
+ V
D2
I
T2
= current value at the time t
2
.
Fig. 2 in shows the current waveform obtained with
an RC network connected between pin 9 and
ground. From to t
1
the current increases as in fig.
1. A difference exists at the time t
2
because the
current starts to increase again. At this time a pulse
is produced by the oscillator circuit that resets the
flip.flop, FF1, and switches on the outout transistor,
Q1. The current increases until the drop on the
sensing resistor R
S1
is equal to V
ref1
(t
3
) and the
cycle repeats.
SIGNAL WAVEFORMS
The switching frequency depends on the value R
and C, as shown in fig. 4 and must be chosen in
the range 10 to 30 KHz.
It is possible with external hardware to change the
reference voltage V
ref
in order to obtain a high peak
current I
p
and a lower holding current I
h
(see fig. 3).
The L295 is provided with a thermal protection that
switches off all the output transistors when the
junction temperature exceeds 150
°
C. The pres-
ence of a hysteresis circuit makes the IC work again
aftera fall of the junction temperature of about
20
°
C.
The analog input pins (V
ref1
, V
ref2
) can be left open
or connected to V
ss
; in this case the circuit works
with an internal reference voltage of about 2.5V and
the peak current in the load is fixed only by the value
of R
s
:
I
p
=
2.5
R
S
Figure 1. Load current waveform with pin 9
connected to GND.
Figure 2. Load current waveform with external
R-C network connected between pin 9 and
ground.
5/8
L295
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|---|---|
| L295_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL SWITCH-MODE SOLENOID DRIVER |
| L295000MAA | 制造商:Arcolectric 功能描述:LED INDICATOR 230V RED 制造商:Arcolectric 功能描述:LED INDICATOR, 230V, RED 制造商:Arcolectric 功能描述:LED INDICATOR, 230V, RED; Mounting Hole Dia:8mm; LED Color:Red; Forward Current If:3mA; Forward Voltage:230V ;RoHS Compliant: Yes |
| L295000MAB | 制造商:Arcolectric 功能描述:LED INDICATOR 230V AMB |
| L295000MAC | 制造商:Arcolectric 功能描述:LED INDICATOR 230V GREEN 制造商:Arcolectric 功能描述:LED INDICATOR, 230V, GREEN 制造商:Arcolectric 功能描述:LED INDICATOR, 230V, GREEN; Mounting Hole Dia:8mm; LED Color:Green; Forward Current If:3mA; Forward Voltage:230V ;RoHS Compliant: Yes |
| L295000MAD | 制造商:Arcolectric 功能描述:LED INDICATOR 230V BLUE 制造商:Arcolectric 功能描述:LED INDICATOR, 230V, BLUE |
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