TLS2205 Datasheet, PDF (7/31 Pages) Texas Instruments – VOICE - COIL MOTOR DRIVER, SPINDLE - MOTOR DRIVER, AND VOLTAGE MONITOR

SLFS040 – DECEMBER 1993
voice-coil motor driver electrical characteristics over recommended range of supply voltage,
T_A = 25 C
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
Total output drain-to-source on-state
resistance, 2 rDS(on)
Total VCM driver voltage drop
VCM driver voltage drop on retract
VCM gain accuracy
VCMA, VCMB
IO = 200 mA
IO = 400 mA
ICRET = 50 mA,
RETSET grounded
2
3
0.6 V
1.2 V
1.3 V
4%
VCM differential linearity
1.6%
Slew rate
.05
V/ s
Control voltage
RETSET
0.7
V
Pullup resistance
CRET,
RETOUT
20
Output voltage
3.88
4 4.12 V
Output impedance
REFBUF
f = 10 kHz
6.1
Source current
7 mA
Output voltage
VCMREF
1.94
2 2.06 V
Clamp voltage
CRET
See Note 6
9
V
NOTE 5: Optional Zener diode may be required on CRET for filtering narrow voltage spikes
spindle-motor driver electrical characteristics over recommended supply voltage range, T_A = 25 C
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
Total output drain-to-source on-state resistance,
2 rDS(on)
Source-driver output voltage slew rate
U, V, W
1.3
1.6
0.07
V/ s
Sink-driver output voltage slew rate
See Note 7
0.07
V/ s
Retract clamp diode forward voltage
Center tap driver-output saturation resistance
U, V, W, CRET
CTDRV
IRETOUT = 50 mA
See Note 8
0.5
V
150
Speed discriminator count range
See Note 9
8 8333 16384
Maximum compensation voltage
VCM DAC word = FFhex
4
V
Maximum spin compensation voltage
RUN MODE
5
V
Minimum spin compensation voltage
0.8
V
Charge-pump leakage current
3
5 nA
Charge-pump output current
SPNCOMP
50
A
Charge-pump output current matching
1%
Spindle-driver start current
U, V, W
1.2 A
NOTES: 6. This slew rate is determined by the percentage of programmed current.
7. CTDRV is an open-drain switch.
8. The typical count (1041) fspindle = 3600 (RPM) at f(MTRCLK) = 1 MHz
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