IR3084A datasheet(4/45 Pages) IRF

4 / 45 page

IR3084A

Page 4 of 45

10/30/2006

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

CURRENT SENSE INPUT

IIN Bias Current

V(SS/DEL) > 0.85V, V(EAOUT) > 0.5V

í2.0

í0.2

1.0

µA

IIN Preconditioning Pull-Down

Resistance

V(SS/DEL) < 0.35V

5.6

12.5

19.4

IIN Preconditioning RESET

Threshold

V(EAOUT)

0.20

0.35

0.50

IIN Preconditioning SET

Threshold

V(SS/DEL)

0.35

0.60

0.85

VBIAS REGULATOR

Output Voltage

í5mA ,9%,$6 P$

6.6

6.9

7.2

Current Limit

í35

í20

í6

Over-Current Comparator

Input Offset Voltage

92&6(7 9

í10

í1

OCSET Bias Current

í53.5

í51

í48.5

µA

SOFT START AND DELAY

Start Delay (TD1)

RDRP =

1.2

1.8

2.6

Soft Start Time (TD2)

RDRP =

0.8

1.6

2.8

VID Sample Delay (TD3)

0.2

1.0

2.5

VRRDY Delay (TD4 + TD5)

0.5

1.3

2.2

OC Delay Time

Note 1

150

250

350

µs

SS/DEL to FB Input Offset

Voltage

With FB = 0V, adjust V(SS/DEL) until

EAOUT drives high

0.85

1.3

1.5

SS/DEL Charge Current

100

µA

SS/DEL Discharge Current

6.5

µA

Charge/Discharge Current

Ratio

9.5

11.2

12.5

µA/µA

OC Discharge Current

Note 1

µA

Charge Voltage

3.6

3.85

4.1

OC/VRRDY Delay

Comparator Threshold

Relative to Charge Voltage,

SS/DEL rising

OC/VRRDY Delay

Comparator Threshold

Relative to Charge Voltage,

SS/DEL falling

100

Delay Comparator Hysteresis

VID Sample Delay

Comparator Threshold

3.10

SS/DEL Discharge

Comparator Threshold

215

ENABLE INPUT

Threshold Voltage

ENABLE rising

775

850

925

Threshold Voltage

ENABLE falling

675

750

825

Threshold Hysteresis

100

140

Input Resistance

100

200

Blanking Time

Noise Pulse < 250ns will not register

an ENABLE state change. Note 1

250

400

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