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PDF L295 Data sheet ( Hoja de datos )
| Número de pieza | L295 | |
| Descripción | DUAL SWITCH-MODE SOLENOID DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L295
DUAL SWITCH-MODE SOLENOID DRIVER
HIGH CURRENT CAPABILITY (up to 2.5A per
channel)
HIGH VOLTAGE OPERATION (up to 46V for
power stage)
HIGH EFFICIENCY SWITCHMODE OPERATION
REGULATED OUTPUT CURRENT (adjustable)
FEW EXTERNAL COMPONENTS
SEPARATE LOGIC SUPPLY
THERMAL PROTECTION
DESCRIPTION
The L295 is a monolithic integrated circuit in a 15 -
lead Multiwatt ® package; it incorporates all the
functions for direct interfacing between digital cir-
cuitry and inductive loads. The L295 is designed to
accept standard microprocessor logic levels at the
inputs and can drive 2 solenoids. The output current
is completely controlled by means of a switch-
ABSOLUTE MAXIMUM RATINGS
Symbol
Vs
Vss
VEN, Vi
Vref
Io
Ptot
Tstg, Tj
Parameter
Supply voltage
Logic supply voltage
Enable and input voltage
Reference voltage
Peak output current (each channel)
- non repetitive (t = 100 µsec)
- repetitive (80% on - 20% off; Ton = 10 ms)
- DC operation
Total power dissipation (at Tcase = 75 °C
Storage and junction temperature
APPLICATION CIRCUIT
PRELIMINARY DATA
Multiwatt 15
ORDER CODE : L295
ing technique allowing very efficient operation.
Furthermore, it includes an enable input and dual
supplies (for interfacing with peripherals running at
a higher voltage than the logic).
The L295 is particularly suitable for applications
such as hammer driving in matrix printers, step
motor driving and electromagnet controllers.
Value
50
12
7
7
3
2.5
2
25
- 40 to 150
Unit
V
V
V
V
A
A
A
W
°C
March 1993
1/8
1 page  
L295
If the oscillator pin (9) is connected to ground the
load current falls to zero as shown in fig. 1.
At this time t2 the channel 1 is disabled, by taking
the inputs Vin1 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=(
VB
R1
+ IT2 )
e
− R1 t
L1
−
VB
R1
where VB = VS + VD1 + VD2
IT2 = current value at the time t2.
Fig. 2 in shows the current waveform obtained with
an RC network connected between pin 9 and
ground. From to t1 the current increases as in fig.
1. A difference exists at the time t2 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 RS1 is equal to Vref1 (t3) and the
cycle repeats.
SIGNAL WAVEFORMS
Figure 1. Load current waveform with pin 9
connected to GND.
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 Vref in order to obtain a high peak
current Ip and a lower holding current Ih (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 (Vref1 , Vref2) can be left open
or connected to Vss; 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 Rs:
Ip =
2.5
RS
Figure 2. Load current waveform with external
R-C network connected between pin 9 and
ground.
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L295.PDF ] | |
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