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參數(shù)資料
| 型號： | MCZ33395EW |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Three-Phase Gate Driver IC |
| 中文描述： | 三相柵極驅(qū)動集成電路 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 282K |
| 代理商： | MCZ33395EW |
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
33395
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Figure 5
). These gate drive outputs supply the peak currents
required to turn ON and hold ON the low-side MOSFETs, as
well as turn OFF the MOSFETs.
V
DD
FUSE
The V
DD
supply of the 33395 IC has an internal fuse, which
will blow and set all outputs of the device to OFF, if the V
DD
voltage exceeds that stated in the maximum rating section of
the data sheet. When this fuse blows, the device is
permanently disabled.
I
SENS
INPUTS
The +I
sens
and -I
sens
pins are inputs to the internal
current sense comparator. In a typical application, these
would receive a a low-pass filtered voltage derived from a
current sense resistor placed in series with the ground return
of the three-phase output bridge. When triggered by the
comparator, the CL (current limit) bit of the internal error
register is set, and the output gate drive pairs (i.e., GDH1 and
GDL1, GDH2 and GDL2, GDH3 and GDL3), are controlled
such that current will cease flowing through the load (refer to
Table 5
, Truth Table, page
12
).
OVERTEMPERATURE AND OVERVOLTAGE
SHUTDOWN CIRCUITS
Internal monitoring is provided for both over temperature
conditions and over voltage conditions. When any of these
conditions presents itself to the IC, the corresponding
internally set bits of the error register are set, and the output
gate drive pairs (i.e., GDH1 and GDL1, GDH2 and GDL2,
GDH3 and GDL3), are controlled such that current will cease
flowing through the load (refer to
Table 5
).
LSE AND HSE INPUT CIRCUITS
The low-side enable input pins (LSE1, LSE2, LSE3) and
high-side enable input pins (HSE1, HSE2, HSE3) form the
input pairs (HSE1 and LSE1, HSE2 and LSE2, HSE3 and
LSE3) which set the logic states of the output gate drive pairs
(i.e., GDH1 and GDL1, GDH2 and GDL2, GDH3 and GDL3)
in accordance with the logic set forth in the Truth Table
(
page 12
). Typically these inputs are supplied from an MCU
or DSP to provide the phasing of the currents applied to a
brushless dc motor's stator coils via the output MOSFET
pairs.
PWM INPUT
The pulse width modulation input provides a single input
pin to accomplish PWM modulation of the output pairs in
accordance with the states of the Mode 0 and Mode 1 inputs
as set forth in the Truth Table (
page 12
).
MODE SELECTION INPUTS
The mode selection inputs (Mode 0 and Mode 1)
determine the PWM implementation of the output pairs in
accordance with the logic set forth in the Truth Table
(
page 12
). PWMing can thus be set to occur either on the
high-side MOSFETs or the low-side MOSFETs, or can be set
to occur on both the high-side and low-side MOSFETs as
"complementary chopping".
TEST PIN
This pin should be grounded or left floating (i.e., do not
connect it to the printed circuit board). It is used by the
automated test equipment to verify proper operation of the
internal overtemperature shut down circuitry. This pin is
susceptible to latch-up and therefore may cause erroneous
operation or device failure if connected to external circuitry.
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