ISL1903FAZ datasheet(11/19 Pages) RENESAS

Nome de Peças	ISL1903FAZ

Descrição Electrónicos	Dimmable Buck LED Driver - AC Mains or DC Input LED Driver

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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11 / 19 page

ISL1903

FN8285 Rev 1.00

Page 11 of 19

September 20, 2012

Unbiased Output Voltage Clamp

VDD = 6V, ILOAD = 3mA

-

1.9

V

Frequency

291

320

349

Hz

Maximum Duty Cycle

REFIN = 0.5V

-

100

%

Minimum On-Time

REFIN = 0V

-

0.5

s

OVP

OVP Threshold

1.46

1.50

1.54

V

OVP Hysteresis

10

20

27

A

Input Bias Current

-1.0

-

1.0

A

OVP Clamp Voltage

IOVP = 1mA

5.4

-

7.0

V

THERMAL PROTECTION

Thermal Shutdown

(Note 8)

150

160

170

°C

Hysteresis

(Note 8)

-

25

-

°C

NOTES:

7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization

and are not production tested.

8. Limits established by characterization and are not production tested.

Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram -

ISL1903” on page 2 and “Typical Application schematics” beginning on page 3. VDD = 17V, RRAMP = 54k, CRAMP = 470pF, TA = -40°C to

+125°C, Typical values are at TA = +25°C; Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)

PARAMETER

TEST CONDITIONS

MIN

(Note 7)

TYP

MAX

(Note 7)

UNITS

Test Waveforms and Circuits

FIGURE 2. RISE/FALL TIME TEST CIRCUIT

FIGURE 3. RISE/FALL TIMES

9

10

11

12

13

14

15

16

1

2

4

3

5

6

7

8

CS+

DHC

OFFREF PWMOUT

VREF

OUT

VDD

OC

OVP

AC

IOUT

RAMP

GND

FB

DELADJ

VERR

ISL1903

8V

1nF

2.2nF

470pF

5k

54k

0 TO1V 120Hz

OUT

OR

PWMOUT

tR

tF

90%

10%

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