ISL6522CRZ-T datasheet(4/14 Pages) INTERSIL

Part #	ISL6522CRZ-T

Description	Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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4 / 14 page

4

FN9030.7

March 4, 2005

Functional Pin Descriptions

RT

This pin provides oscillator switching frequency adjustment.

By placing a resistor (RT) from this pin to GND, the nominal

200kHz switching frequency is increased according to the

following equation:

Conversely, connecting a pull-up resistor (RT) from this pin

to VCC reduces the switching frequency according to the

following equation:

Upper Gate Sink

RUGATE

ISL6522C, ILGATE = 0.3A

-

5.5

10

Ω

ISL6522I, ILGATE = 0.3A

-

5.5

7.2

Ω

Lower Gate Source

ILGATE

VCC = 12V, VLGATE = 6V

300

450

-

mA

Lower Gate Sink

RLGATE

ISL6522C, ILGATE = 0.3A

-

3.5

6.5

Ω

ISL6522I, ILGATE = 0.3A

-

3.5

4.5

Ω

PROTECTION

OCSET Current Source

IOCSET

VOCSET = 4.5VDC

170

200

230

µA

Soft-Start Current

ISS

-10-

µA

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Noted (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Typical Performance Curves

FIGURE 1. RT RESISTANCE vs FREQUENCY

FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

10

100

1000

SWITCHING FREQUENCY (kHz)

10

100

1000

RT PULLUP

TO +12V

RT PULLDOWN

TO VSS

100

200

300

400

500

600

700

800

900

1000

80

70

60

50

40

30

20

10

0

SWITCHING FREQUENCY (kHz)

CGATE = 1000pF

CGATE = 3300pF

CGATE = 10pF

8

9

10

11

12

13

14

7

6

5

4

3

2

1

OCSET

SS

EN

COMP

FB

RT

VCC

LGATE

PGND

BOOT

UGATE

PHASE

GND

PVCC

SOIC

and

TSSOP

QFN

1

3

4

15

SS

COMP

FB

EN

16

14

13

2

12

10

9

11

6

57

8

PVCC

LGATE

PGND

BOOT

GND

Fs 200kHz 510

6

•

RT

------------------

+

≈

(RT to GND)

Fs 200kHz 410

7

•

RT

------------------

–

≈

(RT to 12V)

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