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參數(shù)資料
| 型號： | LM6218 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 224K |
| 代理商： | LM6218 |
Typical Performance Characteristics
for R and C
Selection Graph
vs Temperature
Supply Currents
vs Temperature
Supply Currents
V
sat
vs Temperature
V
drop
vs Temperature
(
@
T
A
e
25
§
C)
Typ. V
drop
vs I
out source
Typ. V
sat
vs I
out sink
TL/H/8679–2
Description of Inputs and Outputs
Pin 1: V
CC1
(
a
5V).
The logic and clock power supply pin.
Pin 2: DIRECTION.
This input determines the direction of
rotation of the motor; ie., clockwise vs. counterclockwise.
See truth table.
Pin 3: DEAD-TIME ENABLE.
This input enables or disables
the dead-time feature. Connecting
a
5V to pin 3 enables
dead-time, and grounding pin 3 disables it. Pin 3 should not
be allowed to float.
Pin 4: CLOCK TIMING.
An RC network connected between
this pin and ground sets the period of the clock oscillator,
which determines the amount of dead-time. See Figure 2
and text.
Pins 5 thru 7: HS1, HS2, and HS3 (Hall-sensor inputs).
These inputs receive the rotor-position sensor inputs from
the motor. Three-phase motors provide all three signals;
four phase motors provide only two, one of which is con-
nected to both HS2 and HS3.
Pin 8: 30/60 SELECT.
This input is used to select the re-
quired decoding for three-phase motors; ie, either ‘‘30-de-
gree’’ (
a
5V) or ‘‘60-degree’’ (ground). Connect pin 8 to
a
5V when using a four-phase motor.
Pin 9: LOGIC GROUND.
Ground for the logic power supply.
Pin 10: POWER GROUND.
Ground for the output buffer
supply.
Pins 11 thru 13: SOURCE OUTPUTS.
The three current-
sourcing outputs which drive the external power devices
that drive the motor.
Pins 14 thru 16: SINK OUTPUTS.
The three current-sinking
outputs which drive the external power devices that drive
the motor.
Pin 17: OUTPUT INHIBIT.
This input disables the LM621
outputs. It is typically driven by the magnitude signal from an
external sign/magnitude PWM generator. Pin 17
e a
5V
e
outputs off.
Pin 18: V
CC2
(
a
5 to
a
40V).
This is the supply for the
collectors of the three current-sourcing outputs (pins 11 thru
13). When driving MOSFET power devices, pin 18 may be
connected to a voltage source of up to
a
40V to achieve
sufficient output swing for the gate. When driving bipolar
power devices, pin 18 should be connected to
a
5V to mini-
mize on-chip power dissipation. Undervoltage lockout auto-
matically shuts down all outputs if the V
CC1
supply is too
low. All outputs will be off if V
CC1
falls below the undervol-
tage lockout voltage.
4
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相關(guān)代理商/技術(shù)參數(shù) |
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| LM6218AWMX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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