SI9993CS datasheet(4/16 Pages) VISHAY

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Si9993CS

Vishay Siliconix

S-60752–Rev. A, 05-Apr-99

FaxBack 408-970-5600, request 70653

www.siliconix.com

System Manager

VDD Undervoltage Detection

Threshold (High-to-Low)

UVADJ Unconnected

4.500

4.625

4.750

VDD Hysteresis

0.05

VCC Undervoltage Detection

Threshold (High-to-Low)

8.5

9.25

10.0

VCC Hysteresis

0.2

POR Time-out

tPOR

PORCAP = 0.5 µF

350

500

650

Delay Time from PWR Failure

to POR Active

tPOR

0.8

1.0

µS

POR Charging Current

IPOR

2µA

POR Comparator Hysteresis

1.0

Adjustable Internal Spindle

Brake Delay Time

tspindly

VCLAMP = 3.0 to 13.2 V

VDD = VCC = 0 V

D3D2(REG1) = 01

192

Internal VCM Retract Delay

Time

tvcmdly

D5D4(REG1) = 01

VTEST Leakage

IVTEST

VCLAMP = 3.0 V, VDD = VCC = 0 V

VTEST = 10 V

1µA

5-V Reference Initial Power-On

Tolerance

VREF

VREF(IN) = VREF(OUT) (Internal Reference)

IOUT = 20 mA to -2 mA

4.75

5.00

5.25

5-V Reference Drift from Initial

Power-On Tolerance

-1.5

1.5

VCM Driver

Transconductance

GmVCM

IMOTOR = 1 A, D5D4(REG0) = 11

1.52

1.60

1.68

A/V

Output Offset Current

IOS

D5D4(REG0) = 11

-25

DAC Reference Output

VREF/2

RLOAD = 100 kΩ

2.09

2.2

2.31

VCMDACIN Input Range

+VCMDACIN or -VCMDACIN to GND

0.1

5.0

VCMDACIN Input Bias Current

Ib(L/S)

Feedback Resistance

RFB

Internal Resistor from IVCMS to COMP1

Ω

3-dB Bandwidth

L/S, I/S and Comp Amp

1.0

MHz

Class B Power Amp

0.4

CMRR of Current Sense

Amplifier

CM Input = 0 to VCC

Head Retract Voltage Clamp

IMOTOR = 60 mA, D7D6(REG1) = 00

0.32

0.4

0.48

Short Circuit Head Retract

Current

120

180

Current Sense Amplifier Zero

Output Voltage

V(IVCMS)

IMOTOR = 0

D7D6(REG0) = 00, D7D6(REG5) = 11

IMOTOR = 0

D7D6(REG0) = 00, D7D6(REG5) = 11

2.32

2.5

2.68

Current Sense Amplifier

Output Gain Ratio

V(IVCMS)/

V(RSV)

dc Gain

2.67

V/V

SPECIFICATIONS

Operating Conditions:

VCC = VMOT = 12 V ±10%, VDD = 5 V ±10%, VREF(IN) = VREF(OUT), RSS = RSV = 0.2 Ω ±1%,

RSRADJ = 20 kΩ ±1%, Si9942-Si9430 LITTLE FOOT Driver, FSYSCLK = 5 MHz, TA = 0 to 70°C

Parameter

Symbol

Specific Test Conditions

Limits

Unit

Mina

Typb

Maxa

∆V

REF

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