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参数资料
| 型号： | PC33253DW |
| 厂商： | Motorola, Inc. |
| 英文描述： | Full Bridge Pre-Driver |
| 中文描述： | 全桥预驱动器 |
| 文件页数： | 10/15页 |
| 文件大小： | 615K |
| 代理商： | PC33253DW |
MC33253
rev3.0 - 10/15
MC33253
The Figure 8 represents a simplified circuitry of the high side gate driver.
Figure 8. High Side Gate Driver
The transistors Tosc1 and Tosc2 are the oscillator switching MOSFETs. When Tosc1 is on, the oscillator is at low level. When
Tosc2 is on, the oscillator is at high level. The high side MOSFET predriver is composed of two transistors T1 and T2. When T1 is on
the HS MOSFET is turn on, when T2 is on the HS MOSFET is off. The capacitor C
cp_out
provides peak current to the HS MOSFET
through T1 during turn on (3) as shown in figure 11.
C
cp
C
cp
choice depends on Power MOSFET characteristics and the working switching frequency. The following diagrams show the
influence of C
cp
value on V
cp_out
average voltage level. The diagrams are given at two different frequencies for two power MOSFETs
(MTP60N06HD and MPT36N06V).
Figure 9. V
cp_out
Versus C
cp
Figure 10.
Ccp_out
V
LR-OUT
Ccp
D1
D2
C1
Vcc
C2
CP_out
SRC_HS
HS
MOSFET
LS
MOSFET
M
T1
T2
Rg
Tosc1
Tosc2
GATE_HS
pins
(3)
18
18.5
19
19.5
20
20.5
21
5
25
45
65
85
Ccp (nF)
V
20KhZ
100 KhZ
18.5
19
19.5
20
20.5
21
21.5
5
25
45
65
85
Ccp (nF)
V
20kHz
100kHz
MTP60N06HD (Q
g
=50nC)
MTP36N06V (Q
g
=40nC)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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