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8958 데이터시트 PDF




Allegro MicroSystems에서 제조한 전자 부품 8958은 전자 산업 및 응용 분야에서
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PDF 형식의 8958 자료 제공

부품번호 8958 기능
기능 VOICE COIL MOTOR DRIVER
제조업체 Allegro MicroSystems
로고 Allegro MicroSystems 로고


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8958 데이터시트, 핀배열, 회로
8958
LOGIC
SUPPLY
1
VCC
INHIBIT
UV1
2
1.5 V +
3
UV2 4
LIMIT 5
GROUNDAB 6
GROUNDAB
PARK
VOLTAGE
SENSE IN–
7
8
99
IN A+ 10
IN A–
OUT A
11
12
+
A
-
24 SENSE OUT
23 PARK
DRIVE
22 PARK
21 GROUND
20 PWR OK
19 GROUNDAB
18 GROUNDAB
17 SENSEIN+
+ 16
B
- 15
VBB 14
13
IN B+
IN B–
LOAD
SUPPLY
OUT B
Dwg. PP-054
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
Supply Voltages, VBB and VCC ............... 16 V
Output Current, IOUT ............................ ±1.0 A
Park Drive Output Current, IPARK
Continuous ................................ 250 mA
Peak .............................................. 1.0 A
Amplifier Input Voltage Range,
VIN ..................................... -2.0 V to VCC
Sense Input Voltage Range,
VSENSE IN ............................ -0.3 V to VCC
Comparator and Digital Inputs,
VIN .................................... -0.3 V to 10 V
IIN .............................................. ±10 mA
Power OK Output, VCEX ......................... 20 V
IC ................................................. 30 mA
Output Clamp Diode Current,
IF (pulsed) ..................................... 1.0 A
Package Power Dissipation, PD .. See Graph
Operating Temperature Range,
TA ...................................... 0°C to +70°C
Junction Temperature, TJ ................... 150°C*
Storage Temperature Range,
TS ................................ -55°C to +150°C
* Fault conditions that produce excessive junction
temperature will activate device thermal shutdown
circuitry. These conditions can be tolerated but
should be avoided.
VOICE COIL MOTOR DRIVER
Providing control and drive of the voice coil motor used for head
positioning in disk drive applications, the A8958CLB is a full-bridge
driver which can be configured so that its output current is a direct
function of an externally applied control voltage or current. This linear
current control function is supplemented by additional circuitry to
protect the heads and the data disk during system failure or normal
system shutdown.
The two ±800 mA driver outputs provide very-low saturation voltage
drops and precise current control utilizing a single current-sensing
resistor connected in series with the load. Under-voltage lockout
disables the system in a controlled sequence if a fault condition occurs.
When activated by the under-voltage comparator, or a park com-
mand, the output power drivers change from a controlled current to a
user-determined constant park voltage. Other features include a power
ok flag, a limit input to force the outputs to their maximum level in either
polarity, an over-riding output disable to shut down both power amplifi-
ers and reduce quiescent supply current, and internal thermal shutdown
which disables the load (but still allowing the head to be parked) in the
event of excessive junction temperatures. The load is re-enabled when
the junction temperature returns to a safe level.
The A8958CLB is supplied in a 24-lead power SOIC for surface-
mount applications. The copper batwing construction provides for
maximum package power dissipation in a minimum package size. It is
rated for continuous operation over the temperature range of 0°C to
+70°C.
FEATURES
s Controlled-Velocity Head Parking
s Zero Deadband
s High Transconductance Bandwidth
s User-Adjustable Transconductance Gain
s ±800 mA Load Current
s Dual Under-Voltage Monitors
with Flag and User-Selectable Trip Points
s Internal Thermal Shutdown Circuitry
s Replaces UC3175
Always order by complete part number, e.g., A8958CLB .




8958 pdf, 반도체, 판매, 대치품
8958
VOICE COIL
MOTOR DRIVER
ELECTRICAL CHARACTERISTICS (continued)
Characteristic
Current Sense Amplifier
Input Offset Voltage
Input Offset Drift
Symbol
Test Conditions
VIO
VIO
VCM = 6 V
VCM = 0 V to 12 V
Voltage Gain
Output Saturation Voltage
Park Function
AVS
VSAT
VID = -1 V to +1 V, VCM = 6 V
VOUT, IOUT(SINK) = 1.5 mA
VCC - VOUT, IOUT(SOURCE) = -1.5 mA
PARK DRIVE Leakage Current
PARK DRIVE Saturation Voltage
PARK Input Threshold
PARK Input Current
PARK VOLTAGE Input Current
Under-Voltage Protection
ICEX
VCE(SAT)
VPARK
IPARK
IPARK V
VCEX = 20 V
IC = 200 mA
VPARK = 1.7 V
UV Threshold
UV Threshold Hysteresis
UV Input Current
PWR OK Saturation Voltage
PWR OK Leakage Current
Auxiliary Functions
VUV
VUV
IUV
VCE(SAT)
ICEX
Low-to-High Trans., Other Input = 6 V
VUV = 1 V
IC = 5 mA
VCEX = 20 V
LIMIT Input Voltage
VLIMIT(L)
VLIMIT(H)
VLIMIT
OUTA forced Low
OUTA forced High
Limit inactive
Open circuit
LIMIT Input Resistance
INHIBIT Input Threshold
INHIBIT Input Current
RLIMIT
V2
I2
VLIMIT = 1.2 V to 1.8 V
V2 = 1.7 V
Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
Min.
Limits
Typ. Max.
Units
— — 2.0
— — 3000
— — 8.0
1.95 2.00 2.05
300 500
400 700
mV
µV/V
µV/°C
mV
mV
— — 100
300 500
0.7 1.1 1.7
— — 100
-150 -500
µA
mV
V
µA
nA
1.48 1.50 1.52
15 25 45
-0.5 -1.5
— — 450
— — 5.0
V
mV
µA
mV
µA
0.7 0.8
2.2 2.3
1.2 1.8
1.45 1.50 1.55
10
0.7 1.1 1.7
— — 200
V
V
V
V
k
V
µA
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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8958 전자부품, 판매, 대치품
8958
VOICE COIL
MOTOR DRIVER
Dimensions in Inches
(for reference only)
24 13
0.0125
0.0091
0.2992
0.2914
0.020 1
0.013
2
3 0.6141
0.5985
0.491
0.394
0.050
0.016
0.050
BSC
NOTE 1
NOTE 3
0° TO 8
0.0926
0.1043
0.0040 MIN.
Dimensions in Millimeters
(controlling dimensions)
24 13
Dwg. MA-008-25 in
0.32
0.23
7.60
7.40
0.51
0.33
1
2
3 15.60
15.20
2.65
2.35
0.10 MIN.
10.65
10.00
1.27
0.40
1.27
BSC
NOTE 1
NOTE 3
0° TO 8
Dwg. MA-008-25A mm
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendors option within limits shown.
www.allegromicro.com

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