參數(shù)資料
型號(hào): MC33883
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: H-Bridge Gate Driver IC(H橋柵極驅(qū)動(dòng)器)
中文描述: H橋門(mén)驅(qū)動(dòng)器集成電路(高橋柵極驅(qū)動(dòng)器)
文件頁(yè)數(shù): 13/20頁(yè)
文件大?。?/td> 556K
代理商: MC33883
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33883
13
C
CP
C
CP
choice depends on power MOSFET characteristics and
the working switching frequency.
Figure 8
contains two
diagrams that depict the influence of C
CP
value on V
CP_OUT
average voltage level. The diagrams represent two different
frequencies for two power MOSFETs, MTP60N06HD and
MPT36N06V.
Figure 8. V
CP_OUT
Versus C
CP
The smaller the C
CP
value is, the smaller the V
CP_OUT
value
is. Moreover, for the 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 33 nF is
recommended.
C
CP_OUT
Figure 9
depicts the simplified C
CP_OUT
current and voltage
waveforms. f
PWM
is the working switching frequency.
Figure 9. Simplified C
CP_OUT
Current and Voltage
Waveforms
As shown above, at high-side MOSFET turn-on V
CP_OUT
voltage decreases. This decrease can be calculated according
to the C
CP_OUT
value as follows:
Where Q
g
is power MOSFET gate charge.
C
LR_OUT
C
LR_OUT
provides peak current needed by the low-side
MOSFET turn-on. V
LR_OUT
decrease is as follows:
Typical Values of Capacitors
In most working cases the following typical values are
recommended for a well-performing charge pump:
C
CP
= 33 nF, C
CP_OUT
= 470 nF, and C
LR_OUT
= 470 nF
These values give a typical 100 mV voltage ripple on V
CP_OUT
and V
LR_OUT
with Q
g
= 50 nC.
MTP60N06HD (Q
g
=50nC)
MTP60N06HD (Q
g
= 50 nC)
18.5
19
19.5
20
20.5
21
21.5
5
25
45
65
85
Ccp (nF)
C
20 kHz
100 kHz
18
18.5
19
19.5
20
20.5
21
5
25
45
65
85
Ccp (nF)
C
100 kHz
MTP60N06HD (Q
g
= 50 nC)
MTP36N06V (Q
g
= 40 nC)
V
C
V
C
20 kHz
Cp_out
V
CP_OUT
state
State
Oscillator
in low
state
f=330kHz
f
f
PWM
out
Ccp
V
CP_OUT
rage V
Cp_out
V
CP_OUT
Oscillator
High Side Turn On
I
CP_OUT
Peak Current
V
CP_OUT
=
C
CP_OUT
Q
g
V
LR_OUT
=
C
LR_OUT
Q
g
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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