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參數(shù)資料
| 型號： | L6280 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 4.4 A, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大小： | 8983K |
| 代理商： | L6280 |
APPLICATION INFORMATION
An application circuit useful to test the perform-
ance of the L6280 can be formed as shown on
Figure 24: CH1 drives one unipolar stepper mo-
tor, CH2 drives a DC motor, CH3 drives one sole-
noid and the SMPS can supply continuously 0.5A.
If the Watch Dog and the Chip Select functions
are not of interest, pins 22 and 23 must be
grounded. Each sensing resistor would be ob-
tained by the parallel of two or more metal film re-
sistor of the same value to minimize their series
equivalent inductance.
Generally, optimum stability of the SMPS voltage
control loop, is achieved by a series network
made by 1nF and 39 K
(see pin 15) and by us-
ing an output capacitor of 10
0F having an
equivalent series resistance of 100 m
(see pin
14): the most of the unexpensive aluminium elec-
trolithic capacitors can be right.
The snubber network at the secondary winding of
the step-down inductor can be saved by accept-
ing a not regulated voltage at the Charge Pump
input pin 13. This condition is not recommended
when the supply voltage and/or the SMPS output
current changes too much (for instance respec-
tively 20V + 30% and/or 100 to 800 mA).
The inductance value of the primary winding of T1
defines the peak-to peak current ripple that flows
throught itself, that is the minimum output current
that allows the correct behaviour in continuous
mode of the SMPS; nevertheless, the device is
not demaged if it is obliged to work in discontinu-
ous mode at a low current level.
Figure 25 shows the characteristics of the trans-
former T1 suitable to be used on the Application
of Figure 24:
The maximum output current is of 500 mA con-
tinuous but current peaks of 800 mA can be
sinked out without the risk of the core saturation.
To avoid the discontinuous mode, the minimum
SMPS output current must be of 70mA. The recti-
fied voltage trend for the high side gate drive at
pin 13 is as shown on Figure 26.
Not equally cheap, the choice of a toroidal core
for T1 can optimize the application.
Instead of this, another solution can be as in Fig-
ure 27a it is shown. This is a full wave rectifier of
the voltage at pin 3; Z1 and R1 clamp the positive
peak while the forward characteristic of the Zener
rectifies the negative peak and charges C1. The
recommended Zener voltage is of 12V.
Could happen that the VSS output voltage is not
requested because already available: in this case
and only if at least one unipolar stepper motor is
continuously driven, the solution shown in Figure
27b can be implemented. The step down output
components can be left out.
The connection of the network is as follows:
A: to pin 4 (or pin 5) when the unipolar motor is
driven via CH1;
to pin 41 (or pin 42) when the unipolar motor
is driven via CH2;
B: to pin 1
C: to pin 13
The SMPS switching frequency is the same of the
oscillator frequency that can be typically defined
by:
fosc
=
9
RC
Referring to Fig. 24 it is calculated fosc = 82KHz.
CH3 is chopped at the same frequency. The out-
put diodes must be chosen according to the sole-
noid working current (50ns of reverse recovery
time or better): for a current less than 1 A, the
PLQ08 is a good choice.
Driving one unipolar stepper motor, output protec-
tion diodes (Transil) are recommended: CH1 in
Fig 24 uses four BZW04 - 48 diodes; when a low
current motor is driven or a Vs less than 20V is
supplied, four fast diodes and only one Zener di-
ode can be used as a protection of the outpus
(see Figure 28). The driving of DC motor needs
the connection as shown for CH2 (full bridge con-
figuration).
The drive of one bipolar stepper motor by using
CH1 and CH2 both in full bridge configuration al-
lows the use of a higher supply voltage level that
however cannot exceed the Absolute Maximum
Figure 23
D0
D1
D2
D3
X1
1
Tristate left and right (see
X000 configuration of full
bridge).
L6280
18/26
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