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参数资料
| 型号： | L6238S013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 9/31页 |
| 文件大小： | 3465K |
| 代理商： | L6238S013TR |
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4.3 Charge Pump
The charge pump circuitry is used as a means of
doubling the analog supply voltage in order to al-
low the upper N-channel DMOS transistors to be
driven like P-channel devices. The energy stored
in the reservoir capacitor is also used to drive the
lower drivers in a brake mode if the analog supply
is lost. Figure 4-3 is a simplified schematioc of the
charge pump circuitry.
A capacitor, Cpump, is used to retrieve energy
from the analog supply and then "pumps" it into
the storage capacitor, Cresvr.
An internal 300KHz oscillator first turns ON Q2 to
quickly charge Cpump to approximately the rail
voltage. The oscillator then turns ON Q1 while
turning OFF Q2. Since the bottom plate of Cpump,
is now effectively at the rail voltage via D2.
A zener-referenced series-pass regulator supplies
Figure 4-3
I1
Islew
VPUMP
SW2
1
0
Cfet
UPPER A
+
-
A2
VCTRL
X4
A3
VPOWER
I2
Islew
SW3
1
0
Cfet
OUTPUT
B
C
OUTA
L1
L2
L3
Q1
Q2
RS
3.1V
SLEW RATE
REFERENCE CURRENT
Q3
Q4
Q5
RSLW
RSENSE
CSA
PWM SLEW/RC
LOWER A
D95IN315
VANALOG
Figure 4-4
L6238S
17/31
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