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ML4425 데이터시트(PDF) 2 Page - Fairchild Semiconductor

부품명 ML4425
상세설명  Sensorless BLDC Motor Controller
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4425 데이터시트(HTML) 2 Page - Fairchild Semiconductor

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ML4425
PRODUCT SPECIFICATION
2
REV. 1.0.2 7/2/01
Pin Description
Pin
Name
Function
1ISENSE
Motor current sense input. When ISENSE exceeds 0.2 ↔ ILIMIT, the output drivers LA,
LB, and LC are shut off for a fixed time determined by CIOS.
2HA
Active low output driver for the phase A high-side switch.
3HB
Active low output driver for the phase B high-side switch.
4HC
Active low output driver for the phase C high-side switch.
5
SPEED
COMP
Speed control loop compensation is set by a series resistor and capacitor from
SPEED COMP to GND.
6CT
A capacitor from CT to GND sets the PWM oscillator frequency.
VREF
6.9V reference voltage output.
8
SPEED SET
Speed loop input which ranges from 0 (stopped) to VREF (maximum speed).
9
LA
Active high output driver for the phase A low-side switch.
10
LB
Active high output driver for the phase B low-side switch.
11
LC
Active high output driver for the phase C low-side switch.
12
ILIMIT
Voltage on this pin sets the ISENSE threshold voltage at 0.2 ↔ ILIMIT, leaving this pin
unconnected selects an internally set threshold.
13
VCO/TACH
This TTL level output corresponds to the signal used to clock the commutation state
machine. The output frequency is proportional to the motor speed when the back-
EMF sensing loop is locked onto the rotor position.
14
VDD
12V power supply input.
15
CVCO
A capacitor to GND sets the voltage-to-frequency ratio of the VCO.
Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ISENSE
HA
HB
HC
SPEED COMP
CT
VREF
SPEED SET
LA
LB
LC
ILIMIT
VCO/TACH
VDD
GND
RREF
CIOS
BRAKE
FB C
FB B
FB A
CRR
SPEED FB
CRT
UV FAULT
CAT
RVCO
CVCO
TOP VIEW
ML4425
28-Pin Narrow PDIP (P28N)
28-Pin SOIC (S28)


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