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33883 Datasheet(PDF) 15 Page - Freescale Semiconductor, Inc

Part # 33883
Description  H-Bridge Gate Driver IC
PDF  21 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33883 Datasheet(HTML) 15 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
15
33883
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
CCP
CCP choice depends on power MOSFET characteristics
and the working switching frequency. Figure 10 contains two
diagrams that depict the influence of CCP value on VCP_OUT
average voltage level. The diagrams represent two different
frequencies for two power MOSFETs, MTP60N06HD and
MPT36N06V.
Figure 10. VCP_OUT Versus CCP
The smaller the CCP value is, the smaller the VCP_OUT
value is. Moreover, for the same CCP value, when the
switching frequency increases, the average VCP_OUT level
decreases. For most of the applications, a typical value of
33 nF is recommended.
CCP_OUT
Figure 11 depicts the simplified CCP_OUT current and
voltage waveforms. fPWM is the working switching frequency.
Figure 11. Simplified CCP_OUT Current and Voltage
Waveforms
As shown above, at high-side MOSFET turn-on VCP_OUT
voltage decreases. This decrease can be calculated
according to the CCP_OUT value as follows:
Where Qg is power MOSFET gate charge.
CLR_OUT
CLR_OUT provides peak current needed by the low-side
MOSFET turn-on. VLR_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:
CCP = 33 nF, CCP_OUT = 470 nF, and CLR_OUT = 470 nF
These values give a typical 100 mV voltage ripple on
VCP_OUT and VLR_OUT with Qg = 50 nC.
MTP60N06HD (Qg=50nC)
18.5
19
19.5
20
20.5
21
21.5
5
25
45
65
85
Ccp (nF)
20 kHz
100 kHz
18
18.5
19
19.5
20
20.5
21
5
25
456585
Ccp (nF)
20KhZ
100 KhZ
MTP60N06HD (Qg = 50 nC)
MTP36N06V (Qg = 40 nC)
MTP60N06HD (Qg = 50 nC)
CCP (nF)
CCP (nF)
20 kHz
100 kHz
VCp_out
Oscillator
in high
state
Oscillator
in low
state
ICp_out
Peak
Current
f=330kHz
fPWM
out
Ccp
V
_
High Side
turn on
rage VCp_out
Oscillator
in High
State Oscillator
in Low
State
f = 330 kHz
fPWM
VCP_OUT
High Side Turn On
VCP_OUT
VCP_OUT
Average
ICP_OUT
Peak Current
VCP_OUT =
CCP_OUT
Qg
VLR_OUT =
CLR_OUT
Qg



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