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參數(shù)資料
| 型號(hào)： | L6285 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 3 CHANNELS MULTIPOWER SYSTEM |
| 中文描述： | 3通道移動(dòng)電站系統(tǒng) |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 303K |
| 代理商： | L6285 |
Charge Pump
The charge pump circuitry generates the overvol-
tage needed to drive the gate of the high sideout-
put DMOS power transistors.It is realized by us-
ing two external capacitors (C1 and C2) and two
integrateddiodes that operate as a full wave recti-
fier (see Fig. 7). The oscillator peak to peak out-
put voltage is stored by C2 and summed to the
Power Supply Voltage V
p
..
The voltage present at the pin BOOT1,is then the
overvoltageneeded to supply the gate of the high
side DMOS drivers.
A0TH
0
1
1
0
A1TH
0
0
1
1
THERMAL PROTECTION
CIRCUIT STATUS
OK
PREALARM
ALARM
NOT POSSIBLE
OPERATING
OPERATING
THERMAL SHUTDOWN
THERMAL PROTECTION
The thermal protection shuts down the chip be-
fore it can reach a dangeroustemperature.
Additional informations to the microprocessor are
availableat the A0TH,A1TH pins.
Figure 7:
Charge Pump Circuit
APPLICATION INFORMATION
A typical application circuit is shown in Fig.8. By
this application it is possible to drive twounipolar
stepper motors (M1,M2) and one DC motor (M3).
As it can be seen, only two external Zener diodes
(D1,D2) are needed to clamp the voltage tran-
sients generated by the stray inductance of the
motor windings. This is recommended when the
peak current is not more than three to four hun-
dred mAmps. For a power supply voltage of
V
P
=24V
±
10%, D1=D2 must be 30V
±
5%-1W
(1N4751A or equivalent).Both the V
P
and the V
S
pins need bypass capacitors (C1,C2,C3); to sup-
ply the high-side DMOS (Source Transistors) at
pin.15 ,only two external capacitors (C4,C5) com-
plete the charge pump circuitry. The oscillator fre-
quency, that is twice the chopping frequency for
M1 and M2, is mainly defined by the network
R6C6:
f
osc
= [0.69 (R
ch
+ Rd
sc
) C
osc
]
-1
, where
R
ch
= R6 ;
R
dsc
= 600 ohm typ.
At the same time, the lockoutduration (or protec-
tion window) needed for a correct chopping be-
havior, is given by :
T
lockout
= 0.69 R
dsc
C
osc
The shown values (fig.8) give a nominal fre-
quency a little bit more than 41KHz and a protec-
tion window of 1.4
μ
s roughly. The Schottkydiode
D3 and thepull-up resistor R5 driven via an open-
collector transistor can generate the Reset func-
tion. The chopping current is sensed across R1
A/B; R2 A/B that must be of a not inductive type.
The DC motor PWM Open Loop Voltage Control
operates at a frequency defined by C7, charged
with a typical constant current source (I = 240
μ
A), up
to V1 = 0.67 V
S
. Since the discharge
time is very short, it can be written:
f
osc
= I / C
osc
V1, where C
osc
= C7.
Tha values indicated in figure give a typical fre-
quencyof about 22 KHz.
L6285
11/16
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