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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)： | 4/8頁 |
| 文件大?。?/td> | 112K |
| 代理商： | L295 |
APPLICATION CIRCUIT
D2, D4 = 2A High speed diodes
D1, D3 = 1A High speed diodes
R1 = R2 = 2
L1 = L2 = 5 mH
)
trr
≤
200 ns
FUNCTIONAL DESCRIPTION
The L295 incorporates two indipendent driver
channals with separate inputs and outputs, each
capable of driving an inductive load (see block
diagram).
The device is controlled by three micriprocessor
compatible digital inputs and two analog inputs.
These inputs are:
EN
chip enable (digital input, active low),
enables both channels when in the low
state.
V
in1
, V
in2
channel inputs (digital inputs, active
high), enable each channel inde-
pendently. A channel is actived when
both EN and the appropriate channel
input are active.
V
ref1
, V
ref2
referce voltages (analog inputs), used
to program the peak load currents.
Peak load current is proportional to V
ref
.
Since the two channels are identical, only channel
one will be described.
The following description applies also the channel
two, replacing FF2 for FF1, V
ref
for V
ref1
etc.
When the channel is avtivated by low level on the
EN input and a high level on the channel input, V
in2
,
the output transistors Q1 and Q2 switch on and
current flows in the load according to the exponen-
tial law:
I
=
V
R1
(
1
e
R1 t
L1
)
where:
R1 and R2 are the resistance and in-
ductance of the load and V is the volt-
age available on the load (V
s
- V
drop
-
V
sense
).
The current increases until the voltage on the ex-
ternal sensing resistor, R
S1
, reaches the reference
voltage, V
ref1
. This peak current, I
p1
, is given by:
I
p1
=
V
ref1
R
S1
At this point the comparator output, Vomp1, sete
the RS flip-flop, FF1, that turns off the output tran-
sistor, Q1. The load current flowing through D2, Q2,
R
S1
, decreases according to the law:
I
=
(
V
A
R
1
+
I
p1
)
e
R1
t
L1
V
A
R1
where V
A
= V
CEsat Q2
+ V
sense
+ V
D2
4/8
L295
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相關(guān)代理商/技術(shù)參數(shù) |
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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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