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參數(shù)資料
| 型號： | MCZ33927EK |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -100; Ic (A): -1; Pc (W): 0.9; hFE: 140 to 350; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
| 中文描述： | 三相場效應(yīng)晶體管預(yù)驅(qū)動器 |
| 文件頁數(shù)： | 26/44頁 |
| 文件大?。?/td> | 490K |
| 代理商： | MCZ33927EK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
26
33927
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INTRODUCTION
DRIVER FAULT PROTECTION
The 33927 IC integrates several protection mechanisms
against various faults. The first of them is the Current Sense
Amplifier with the Overcurrent Comparator. These two blocks
are common for all three driver phases.
Current Sense Amplifier
This amplifier is usually connected as a differential
amplifier (see
Figure 9
). It senses a current flowing through
the external FETs as a voltage across the current sense
resistor R
SENSE
. Since the amplifier common mode range
does not extend below ground, it is necessary to use an
external reference to permit measuring both positive and
negative currents.
The amplifier output can be monitored directly (e.g. by the
microcontroller’s ADC) at the AMP_OUT pin, providing the
means for closed loop control with the 33927.
The output voltage is internally compared with the
Overcurrent Comparator threshold voltage (see
Figure 17
).
Overcurrent Comparator
The amplified voltage across the Rsense is compared with
the pre-set threshold value by the Overcurrent Comparator
input. If the Current Sense Amplifier output voltage exceeds
the threshold of the Overcurrent Comparator it would change
the status of its output (OC_OUT pin) and the fault condition
would be latched (see
Figure 15
).
The occurrence of this fault would be signalled by the
return value of the Status Register 0. If the proper Interrupt
Mask has been set, this fault condition will generate an
interrupt - the INT pin will be asserted High. The INT will be
held in the High state until the fault is removed, and the
appropriate bit in the Status Register 0 is cleared by the
CLINT0 command. This fault reporting technique is
described in detail in the
Logic Commands and Registers
section.
Desaturation Detector
The Desaturation Detector is a comparator integrated into
the output driver of each phase channel. It provides an
additional means to protect against “Short-to-Ground” fault
condition when the output node gets shorted to the supply
voltage (short across the high-side FET).
Figure 13. Short to Ground Detection
When switching from low-side to high-side, the high-side
will be commanded ON after the end of the deadtime. The
deadtime period starts when the low-side is commanded
OFF. If the voltage at P
X-HS_S
is less than 1.4V below V
BAT
after the blanking time (t
BLANK
) a desaturation fault is
initiated. An additional 1ms digital filter is applied from the
initiation of the desaturation fault before it is registered, and
all phase drivers are turned OFF (placed in a high impedance
state). If the desaturation fault condition clears before the
filter time expires, the fault is ignored and the filter timer
resets.
Valid faults are registered in the fault status register, which
can be retrieved by way of the SPI. Additional SPI commands
will mask the INT flag and disable output stage shutdown,
due to desaturation and phase errors. See the
Logic
Commands and Registers
section for details on masking INT
behavior and disabling the protective function.
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|---|---|
| MCZ33927EK/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Three-Phase Field Effect Transistor Pre-Driver |
| MCZ33927EKR2 | 功能描述:功率驅(qū)動器IC THREE PHASE PRE- DRIVER RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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| MCZ33937AEK | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 3 Phase Pre-Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MCZ33937AEK/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Three Phase Field Effect Transistor Pre-driver |
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