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參數資料
| 型號： | MC33253 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Full Bridge Pre-Driver |
| 中文描述： | 全橋預驅動器 |
| 文件頁數： | 11/15頁 |
| 文件大小： | 615K |
| 代理商： | MC33253 |
MC33253
rev3.0 - 11/15
MC33253
The smaller C
cp
value is, the smaller V
cp_out
value is. Moreover, for a same C
cp
value, when the switching frequency
increases, the average V
cp_out
level decreases. For most of the applications a typical value of 33nF is recommended.
C
cp_out
As shown in figure 11, at high side MOSFET turn on, V
cp_out
voltage decreases. This decrease can be calculated according to
C
cp_out
value as following :
Q
g
: Power MosFET Gate Charge
The following figure is the simplified C
cp_out
current and voltage waveforms.
f
pwm
: working switching frequency
Figure 11. Simplified C
cp_out
Current and Voltage Waveforms
C
LR_OUT
C
LR_OUT
provides peak current needed by the low side MOSFET turn on. V
LR_OUT
decreasing is as follow:
Capacitors typical values
In most working cases the following typical values are advised for a good charge pump performing:
C
cp
=33nF, C
cp_out
=470nF and C
LR_OUT
=470nF.
These values give a typical 100mV voltage ripple on V
cp_out
and V
LR_OUT
with Q
g
=50nC.
OP-Amp
The built-in A.O.P. available in the MC33253 allows to get a voltage image of the H-bridge current. This voltage can be
provided by a shunt resistor, as shown in figure 13.
Typically shunt resistivity is dimensioned as low as possible (25mOhm/10A). The maximum A.O.P output voltage is 5V.
Therefore a gain of 10 sets the maximum drop voltage on the sensing resistance at 500mV.
out
cp
g
out
Ccp
C
Q
V
_
_
=
V
Cp_out
Oscillator
in high
state
Oscillator
in low
state
I
Cp_out
Peak
Current
f=330kHz
f
PWM
out
Ccp
V
_
High Side
turn on
average V
Cp_out
out
LR
g
out
LR
C
Q
V
_
_
=
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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