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參數(shù)資料
| 型號(hào)： | MC33883R2 |
| 廠商： | Motorola, Inc. |
| 英文描述： | H-Bridge Gate Driver IC |
| 中文描述： | H橋門驅(qū)動(dòng)器集成電路 |
| 文件頁(yè)數(shù)： | 12/20頁(yè) |
| 文件大小： | 556K |
| 代理商： | MC33883R2 |
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33883
12
Go to: www.freescale.com
Low-Drop Linear Regulator
The low-drop linear regulator is supplied by V
CC2
. If V
CC2
exceeds 15.0 V, the output is limited to 14.5 V (typical).
The low-drop linear regulator provides the 5.0 V for the logic
section of the driver, the V
gs_ls
buffered at LR_OUT, and the
+14.5 V for the charge pump, which generates the CP_OUT
The low-drop linear regulator provides 4.0 mA average current
per driver stage.
In case of the full bridge, that means approximately 16 mA —
8.0 mA for the high side and 8.0 mA for the low side.
Note:
The average current required to switch a gate with a
frequency of 100 kHz is:
I
CP
=Q
g
* f
PWM
= 80nC*100kHz =8.0mA
In a full-bridge application only one high side and one low side
switches on or off at the same time.
Charge Pump
The charge pump generates the high-side driver supply
voltage (CP_OUT), buffered at C
CP_OUT
.
Figure 6
shows the
charge pump basic circuit without load.
Figure 6. Charge Pump Basic Circuit
When the oscillator is in low state [(1) in
Figure 6
], C
CP
is
charged through D2 until its voltage reaches V
CC
- V
D2
. When
the oscillator is in high state (2), C
CP
is discharged though D1
in C
CP_OUT,
and final voltage of the charge pump, V
CP_OUT
, is
V
cc
+ V
LR_OUT
- 2V
D
. The frequency of the 33883 oscillator is
about 330 kHz.
External Capacitors Choice
External capacitors on the charge pump and on the linear
regulator are necessary to supply high peak current absorbed
during switching.
Figure 7
represents a simplified circuitry of the high-side gate
driver. 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 capacitor
C
CP_OUT
provides peak current to the high-side MOSFET
through HSS during turn-on (3).
Figure 7. High-Side Gate Driver
Osc.
Vbat
V
CP_OUT
Ccp_out
C
V
V
LR_OUT
Ccp
D1
D2
A
(1)
(2)
C1
Ccp_out
C
LR-OUT
V
LR_OUT
Ccp
CP
D1
D2
C1
Vcc
V
C2
CP_OUT
SRC_HS
HS
High-Side
MOSFET
Low-Side
MOSFET
HSS
Rg
Tosc1
Tosc1
Tosc2
Tosc2
GATE_HS
pins
(3)
LSS
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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