TPS51222

www.ti.com............................................................................................................................................................................................... SLUS908 – JANUARY 2009

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, EN = 3.3V, VIN = 12V, V5SW = 5V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT AMPLIFIER

GC

Gain

CSNx = 5V, TA = 25°C

(2)

1.667

Common mode Input

VIC

0

13

V

Voltage Range

Differential Input Voltage

VID

TA = 25°C

–75

75

mV

Range

POWERGOOD

PG in from lower

92.5%

95%

97.5%

V(THPG)

PG threshold

PG in from higher

102.5%

105%

107.5%

PG hysteresis

5%

I(PG)

PG sink Current

PGOOD = 0.5 V

5

mA

t(PGDLY)

PGOOD Delay

Delay for PG in

0.8

1

1.2

ms

SOFTSTART

t(SSDYL)

Soft Start Delay

Delay for Soft Start, ENx = Hi to SS-ramp starts

200

µs

t(SS)

Soft Start Time

Internal Soft Start

960

µs

FREQUENCY AND DUTY CONTROL

f(SW)

Switching Frequency

Rf = 330 k

Ω

273

303

333

kHz

Lo to Hi

0.7

1.3

2

V

V(THRF)

RF Threshold

Hysteresis

0.2

V

Sync Input Frequency

f(SYNC)

200

1000

kHz

Range(2)

V(DRVH) = 90% to 10%, No Load, CCM/ OOA

(2)

120

ns

tONmin

Minimum On Time

V(DRVH) = 90% to 10%, No Load, Auto-skip

160

250

ns

tOFFmin

Minimum Off Time

V(DRVH) = 10% to 90%, No Load

290

400

ns

DRVH-off to DRVL-on

10

30

50

ns

tD

Dead time

DRVL-off to DRVH-on

30

40

70

ns

V(DTH)

DRVH-off threshold

DRVH to GND (2)

1

V

V(DTL)

DRVL-off threshold

DRVL to GND(2)

1

V

CURRENT SENSE

TA = 0 to 85°C

56

60

65

2 V< VCSNx < 12.6 V

TA = –40 to 85°C

55

60

68

V(OCL)

Current limit threshold

mV

TA = 0 to 85°C

55

60

67

0.95 V < VCSNx < 12.6 V

TA = –40 to 85°C

54

60

72

Positive

5

Auto-Zero cross adjustable

VZCAJ

0.95 V < VCSNx < 12.6 V, Auto-skip

mV

offset range

Negative

–5

Zero cross detection

V(ZC)

0.95 V < VCSNx < 12.6 V, OOA

–4

0

4

mV

comparator Offset

TA = 0 to 85°C

–50

–60

–73

Negative current limit

V(OCLN-LV)

0.95 V < VCSNx < 12.6 V

threshold

TA = –40 to 85°C

–49

–60

–77

(2)

Specified by design.

Copyright © 2009, Texas Instruments Incorporated

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