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| 型号： | AA2920A |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器杂项-数据表参考 |
| 文件页数： | 4/8页 |
| 文件大小： | 297K |
| 代理商： | AA2920A |
5
6
Figure 4: High Voltage Output (OUT5) vs. Reset
(R13) and OUT1.
BILEVEL DRIVE
AA2920A PIN DESCRIPTION
The basic function of a step motor driver is to control the motor winding currents.
Motor performance is determined by how fast the driver can increase and decrease
the winding currents. A rapid rise in winding current is achieved by applying a high
voltage directly to a motor. This rapid rise of current is also referred to as the "kick"
or operating current. When a desired current level is reached, a low voltage is
applied to maintain a suitable holding current level. When a motor winding is
turned off, a rapid decrease in winding current is achieved by routing the energy in
the collapsing field back to the power supply through a high voltage path. The high
voltage supply furnishes the energy necessary to maintain motor output torque at
high step rates thus providing high mechanical power output. The low voltage
supply provides much of the current needed at low step rates and all of the holding
current.
PIN
NAME
DESCRIPTION
1
Vdd
Power (+5Vdc)
2
VHV
Driver High Voltage
3
B24
Base Output for High Voltage Darlington Transistor.
( Phase 2 and Phase 4)
4
E24
Emitter Output for High Voltage Darlington Transistor.
( Phase 2 and Phase 4)
The efficiency of the bilevel drive makes for step motor performance that is far
superior to that produced by L/R drives. Also, bilevel drivers do not use high
frequency switching techniques as chopper drivers do. Consequently, they do not
create the EMI, RFI, and motor heating problems that are associated with chopper
drivers.
5
B13
Base Output for High Voltage Darlington Transistor.
( Phase 1 and Phase 3)
6
E13
Emitter Output for High Voltage Darlington Transistor.
( Phase 1 and Phase 3)
AA2920A Operation
Each time the AA2920 receives a clock signal, the phase outputs change state.
When a phase output turns on, a high voltage output also turns on. This high
voltage output is used to turn on a high-side switch. The high voltage output will
stay on until the chip gets a reset signal. In Figure 4, OUT1 turns on when the
CLOCK input goes low. OUT5 turns on at the same time. OUT5 stays on until the
reset input, R13 goes low. The waveforms in Figure 4 are for half-step operation.
In half-step operation, the phase outputs are on for three clock cycles. The high
voltage output will turn on the first two of these cycles. If the reset input never goes
low, the high voltage output will stay on. In full-step operation, each phase output
is on for two clock cycles and the corresponding high voltage output will turn on at
the beginning of each clock cycle.
7
HV OFF
Grounding this pin will disable the High Voltage.
8
Reg A
supply with a LM317 Voltage Regulator.
Resistor Network Useful in producing an external 5Vdc
9
1B01
Base Driver for Phase 1 (Output Impedence of 500
Ohms.)
10
2B01
Base Driver for Phase 1 (Output Impedence of 150
Ohms.)
11
1B03
Base Driver for Phase 3 (Output Impedence of 500
Ohms.)
12
2B03
Base Driver for Phase 3 (Output Impedence of 150
Ohms.)
13
1B02
Base Driver for Phase 2 (Output Impedence of 500
Ohms.)
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