파트넘버.co.kr 8936 데이터시트 PDF


8936 반도체 회로 부품 판매점

VOICE COIL MOTOR DRIVER



Allegro MicroSystems 로고
Allegro MicroSystems
8936 데이터시트, 핀배열, 회로
8936
INTERIM DATA SHEET
V(SOubIjeCctEto COILchange without nMotiOceT) OR
March 16, 1993
8936DRIVER
VOICE COIL MOTOR DRIVER
A8936CLW
Providing control and drive of the voice coil motor used for head
positioning in 5 V disk drive applications, the A8936C— is a full-bridge
RET REF 1
28 RET SET
driver which can be configured so that its output current is a direct
function of an externally applied control voltage or current. This linear
V FLT 2
PROTECT
R
27 VSENS
current control function is supplemented by additional circuitry to
V BEMF 3
CIRCUIT
SQ
26 VEL FLT
protect the heads and the data disk during system failure or normal
GROUND 4
UV SET 5
TR OUTP 6
OUT 7
CEN VEL FLT 8
UINN 9
D YVELIN 10
LRETRACT 11
WINDOW
COMP.
V REF
+ VREF
25 V SENS FB
24 SGND N
23 OUTP
VDD 22
LOAD
SUPPLY
21 OUT N
20 SGND P
19 ACT FB
18 PWR OFF
O NFAULT 12
MP RESET 13
PROTECT
CIRCUIT
R OSIGNAL
SUPPLY
14
V CC
17 H GAIN
+ 16 REFERENCE
15 ACT
P EDwg.PP-046A
D CABSOLUTE MAXIMUM RATINGS
E NSupply Voltages, VCC and VDD ........... 6.0 V
U EOutput Current, IOUT (peak) .......... ±600 mA
(continuous) ........................... ±500 mA
IN RAnalog Input Voltage Range,
VIN ................................... -0.3 V to VCC
T ELogic Input Voltage Range,
N FVIN ............................... -0.3 V to +6.0 V
Package Power Dissipation,
O EPD ........................................ See Graph
Operating Temperature Range,
C RTA ..................................... 0°C to +70°C
Junction Temperature, TJ .............. +150°C
IS RStorage Temperature Range,
TS ................................ -55°C to +150°C
D FO† Fault conditions that produce excessive
system shutdown. An under- or over-velocity sense disables the
system in a controlled sequence if a fault condition occurs.
The two ±500 mA MOS driver outputs provide very low saturation
voltage and minimal power dissipation. Additional headroom is
achieved by the sense-FET structure eliminating the need for an
external current-sense resistor. Thermal protection and under-voltage
lockout disables the system in a controlled sequence if a fault condi-
tion occurs.
FEATURES
s Over-Velocity Fault Function
s Lossless Current Sensing
s Zero Deadband
s High Transconductance Bandwidth
s User-Adjustable Transconductance Gain
s Digital Transconductance Gain Switch (4:1 Ratio)
s 5 Volt Monitor with Selectable UV Trip Point
s Retract Circuitry Functional to 0 Volts
s Chip Enable/Sleep Mode Function
s 1 V at 500 mA Output Saturation Voltage
s Internal Thermal Shutdown Circuitry
junction temperature will activate device thermal
shutdown circuitry. These conditions can be
tolerated, but should be avoided.
Output current rating may be restricted to a value
Always order by complete part number:
determined by system concerns and factors.
These include: system duty cycle and timing,
Part Number Package
ambient temperature, and use of any heatsinking
and/or forced cooling. For reliable operation the
specified maximum junction temperature should
A8936CJT 64-Lead Thin Quad Flatpack
not be exceeded.
A8936CLW 28-Lead SOIC
A
TM
MicroSystems, Inc.


8936 데이터시트, 핀배열, 회로
8936
VOICE COIL MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
= 'LW' WIDE-BODY SOIC
= 'JT' THIN QUAD FLATPACK
ACT FB 19 1
SIGNAL
SUPPLY
14 53
V CC
I SENSE +
LOAD
SUPPLY
22 8
VDD
ACT 15 55
REFERENCE 16 58
ERROR
AMP
+
POWER
AMP
+
V REF
35 7 OUT
45 9 IN N
2 20 SGND P
13 23 OUT P
H GAIN 17 60
PWR OFF 18 62
2V
POWER
CONTROL
LOGIC
TSD
I SENSE
CURRENT-SENSE
AMP
V REF +
4 21 OUT N
15 24 SGND N
16 25 V SENS FB
21 27 VSENS
FAULT 12 50
MPRESET 13 51
PROTECTION
CIRCUITRY
33 28
53
27
2
RETRACT
CONTROL
23 25 47 34
28 1 11 6
Q
Q
19
26
WINDOW 46 10 VEL IN
S COMP. VREF
R 36 8 EN VEL FLT
30
4
GROUND
Dwg. FP-030A
A8936CJT
2.0
+
V CC
PROTECT.
CIRCUIT
1.5
1.0
0.5
V DD
V REF
WINDOW
COMP.
V REF
+
0
25
A
50 75 100 125
AMBIENT TEMPERATURE IN °C
150
Dwg. GP-034
SR
Q
RETRACT
CONTROL
PROTECT.
CIRCUIT
TM
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
1W1o5rcNeosrttehre,aMsat sCsuatcohffu, sBeotxts1051063165-0036 (508) 853-5000
WCooprcyerisgthetr,©M1a9s9s2a,c1h9u9s3e,ttAsll0e1g6ro15M-0ic0r3o6Sy(s5t0e8m)s8,5In3c-5. 000
Dwg. PP-052-1




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