A3933

更新时间： 2024-01-12 05:15:19

品牌	Logo	应用领域
急速微 - ALLEGRO		控制器
页数	文件大小	规格书
12页	169K
描述
THREE-PHASE POWER MOSFET CONTROLLER

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A3933 技术参数

生命周期：	Obsolete	零件包装代码：	QFJ
包装说明：	QCCJ,	针数：	32
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.81
模拟集成电路 - 其他类型：	BRUSHLESS DC MOTOR CONTROLLER	JESD-30 代码：	R-PQCC-J32
长度：	13.97 mm	功能数量：	1
端子数量：	32	最高工作温度：	85 °C
最低工作温度：	-20 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	QCCJ	封装形状：	RECTANGULAR
封装形式：	CHIP CARRIER	认证状态：	Not Qualified
座面最大高度：	3.55 mm	最大供电电压 (Vsup)：	28 V
最小供电电压 (Vsup)：	12 V	标称供电电压 (Vsup)：	15 V
表面贴装：	YES	温度等级：	OTHER
端子形式：	J BEND	端子节距：	1.27 mm
端子位置：	QUAD	宽度：	11.43 mm
Base Number Matches：	1

A3933 数据手册

3933

THREE-PHASE POWER

MOSFET CONTROLLER

Applications Information

Bootstrap Capacitor Selection. The high-side bootstrap

circuit operates on a charge-transfer principle. The gate charge

(Q_g) specification of the external power MOSFET must be

taken into consideration. The bootstrap capacitor must be large

enough to turn on the MOSFET without losing significant gate

voltage. If the bootstrap capacitor is too large, it would take too

long to charge up during the off portion of the PWM cycle. The

capacitor value must be selected with both of these constraints

in mind.

bootstrap capacitor. When the bootstrap capacitor has been

properly charged, the high side is turned back ON. The circuit

will allow three faults of this type within one commutation

cycle before signaling a fault and coast the motor (all gate

outputs go low).

2) Bootstrap Monitor. The bootstrap capacitor is charged

whenever a sink-side MOSFET is ON, Sx output goes low, and

the load current recirculates. This happens constantly during

normal operation. A 60 µs timer is started at the beginning of

this cycle and the capacitor is charged with typically 100 mA.

The bootstrap capacitor voltage is clamped at approximately

87% of V_CCOUT. If the capacitor is not charged to the clamp

voltage in 60 µs, a fault is signaled and the motor will coast.

1) Minimum bootstrap capacitor value to transfer charge. The

charge on the bootstrap capacitor should be 20x greater than the

gate charge (Q_g) of the power MOSFET.

Example: For Q_g= 0.025 µC, select

3) Undervoltage. The internal V_CCOUTregulator supplies the

low-side gate driver and the bootstrap charge current. It is

critical to ensure that the voltages are at a proper level before

enabling any of the outputs. The undervoltage circuit is active

during power up and will force a motor coast condition until

V_CCOUTis greater than approximately 10 V.

C_boot= 20 x Q_g/10.5 V = 0.047 µF.

Check for maximum V_gdrop at turn on: dq = C_bootx dV_g, where

Q_g= dq.

dV_g= dq/C_boot= 0.025 µC/0.047 µF = 532 mV.

2) Calculate minimum PWM “OFF” cycle with C_boot= 0.047 µF.

dt = r_ox C_bootx ln(0.036/[Q_g/C_boot+ 0.036])

4) Hall Invalid. Illegal codes for the HALL inputs (000 or

111) will force a fault and coast the motor.

where r_o= 20 ohms, the equivalent internal series resistance of

the bootstrap capacitor monitor circuit.

Faults are cleared at the beginning of each commutation. If a

stalled motor results from a fault, the fault can only be cleared

by toggling the RESET terminal or by a power-up sequence.

The sink-side MOSFET will be held OFF for this minimum

time such that the bootstrap capacitor can be recharged

independently of the PWM input frequency.

Current Control. Internal fixed off-time PWM circuitry is

implemented to limit load current to a desired value. The

external sense resistor combined with the applied analog

voltage to REF terminal will set the peak current level

approximately

The above equation is valid for PWM cycles after the bootstrap

capacitor has been charged once. For the first cycle after a

motor phase commutates from Hi-Z to GHx ON, or during the

first charging cycle at power-up, the circuit will ignore PWM

signals until it has been charged.

I_TRIP≈ V_REF/R_S.

After the peak level is reached, the sense comparator trips and

the load current will decay for a fixed off time.

The time required to charge up at power up and at commutation

change is approximately:

An external resistor (R_T) and capacitor (C_T) are used to set the

fixed off-time period (t_off= R_Tx C_T). The t_offshould be in the

range of 10 µs to 50 µs. Longer values for t_offcan result in

audible noise problems.

t = C_bootx 7 V/0.1 A

Protection Circuitry. The A3933 will protect the external

MOSFETs by shutting down the gate drive if any of the

following conditions are detected:

Torque control can be implemented by varying the REF input

voltage as long as the PWM input stays high. If direct control

of the torque/current is desired by PWM input, a voltage can be

applied to the REF input to set an absolute maximum current

limit.

1) Gate Source Monitor (high side only). The voltage on

the GHx terminals must stay 7 V higher than the source. If this

voltage droops below the threshold, the high side turns OFF,

and the low-side gate will turn ON in an attempt to recharge the

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

1...5 6 789 10 11 12

中文翻译

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与A3933相关器件

型号	品牌	描述	获取价格	数据表
A3933SEQ	ALLEGRO	THREE-PHASE POWER MOSFET CONTROLLER	获取价格
A3933SEQTR	ALLEGRO	Brushless DC Motor Controller, PQCC32, 9 X 7 MM, PLASTIC, QCC-32	获取价格
A3934-0000T	3M	100 x 100, PCB Two Row	获取价格
A3934-0010T	3M	100 x 100, PCB Two Row	获取价格
A3934-2000T	3M	100 x 100, PCB Two Row	获取价格
A3934-2010T	3M	100 x 100, PCB Two Row	获取价格
A3935	ALLEGRO	3-Phase Power MOSFET Controller for Automotive Applications	获取价格
A3935KE	ALLEGRO	3-PHASE POWER MOSFET CONTROLLER	获取价格
A3935KED	ALLEGRO	Half Bridge Based MOSFET Driver, 0.85A, PQCC44, PLASTIC, LCC-44	获取价格
A3935KJP	ALLEGRO	3-PHASE POWER MOSFET CONTROLLER	获取价格
A3935KLQ	ALLEGRO	3-PHASE POWER MOSFET CONTROLLER	获取价格
A3935KLQ-T	ALLEGRO	3-Phase Power MOSFET Controller for Automotive Applications	获取价格
A3935KLQTR	ALLEGRO	暂无描述	获取价格
A3936-0000T	3M	100 x 100, PCB Two Row	获取价格
A3936-0010T	3M	100 x 100, PCB Two Row	获取价格
A3936-2000T	3M	100 x 100, PCB Two Row	获取价格
A3936-2010T	3M	100 x 100, PCB Two Row	获取价格
A3936SED	ALLEGRO	DMOS THREE-PHASE PWM MOTOR DRIVER	获取价格
A3936SED-T	ALLEGRO	DMOS THREE-PHASE PWM MOTOR DRIVER	获取价格
A3936SEDTR	ALLEGRO	Brushless DC Motor Controller, 3A, NMOS, PQCC44, PLASTIC, LCC-44	获取价格

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