IR3521 datasheet(7/45 Pages) IRF

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IR3521

Page 7

V3.03

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

Soft Start and Delay

Start Delay

Measure Enable to EAOUTx activation

2.9

3.5

Start-up Time

Measure Enable activation to PGOOD

OC Delay Time

V(IINx) – V(OCSETx) = 500 mV

170

325

SS/DELx to FBx Input Offset

Voltage

With FBx = 0V, adjust V(SS/DELx) until

EAOUTx drives high

0.7

1.4

1.9

Charge Current

-30

-50

-70

A

OC Delay/VID Off Discharge

Currents

Note 1

A

Fault Discharge Current

2.5

4.5

6.5

A

Hiccup Duty Cycle

I(Fault) / I(Charge)

uA/uA

Charge Voltage

3.5

3.9

4.2

Delay Comparator Threshold

Relative to Charge Voltage, SS/DELx

rising Note 1

Delay Comparator Threshold

Relative to Charge Voltage, SS/DELx

falling Note 1

120

Delay Comparator Hysteresis

Note 1

Discharge Comp. Threshold

150

200

300

Over-Current Comparators

Input Offset Voltage

1V ≤ V(OCSETx) ≤ 3.3V

-35

OCSET Bias Current

-5%

Vrosc(V)*100

0/Rosc(KΩ)

+5%

A

2048-4096 Count Threshold

Adjust ROSC value to find threshold

kΩ

1024-2048 Count Threshold

Adjust ROSC value to find threshold

kΩ

Error Amplifiers

VID ≥ 1V

-0.5

0.5

0.8V ≤ VID < 1V

-5

System Set-Point Accuracy

(Deviation from Table 1, 2, and

3 per test circuit in Figures 2A

& 2B)

0.5V ≤ VID < 0.8V

-8

Input Offset Voltage

Measure V(FBx) – V(VDACx)). Note 2

-1

FB1 Bias Current

-5%

Vrosc(V)*1000

/Rosc(KΩ)

+5%

A

FB2 Bias Current

-1

A

DC Gain

Note 1

100

110

135

Bandwidth

Note 1

MHz

Slew Rate

Note 1

5.5

s

Sink Current

0.4

0.85

Source Current

5.0

8.5

12.0

Maximum Voltage

Measure V(VCCL) – V(EAOUTx)

500

780

950

Minimum Voltage

120

250

Open Voltage Loop Detection

Threshold

Measure V(VCCL) - V(EAOUT), Relative

to Error Amplifier maximum voltage.

125

300

600

Open Voltage Loop Detection

Delay

Measure PHSOUT pulse numbers from

V(EAOUTx) = V(VCCL) to PGOOD = low.

Pulses

Enable Input

Blanking Time

Noise Pulse < 100ns will not register an

ENABLE state change. Note 1

250

400

VDAC References

Source Currents

Includes I(OCSETx)

-8%

3050*Vrosc(V)

/ ROSC(kΩ)

+8%

A

Sink Currents

Includes I(OCSETx)

-8%

2650*Vrosc(V)

/ ROSC(kΩ)

+8%

A

PGOOD Output

Under Voltage Threshold -

Voutx Decreasing

Reference to VDACx

-365

-315

-265

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