TPS60231 datasheet(6/16 Pages) TI

Teilenummer	TPS60231

Bauteilbeschribung	WHITE LED CHARGE PUMP CURRENT SOURCE WITH PWM BRIGHTNESS CONTROL

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TYPICAL CHARACTERISTICS

Table of Graphs

0

10

20

30

40

50

60

70

80

90

100

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

5.9

6.3

ILED = 25 mA

VI − Input Voltage − V

ILED = 15 mA

ILED = 10 mA

ILED = 5 mA

0

10

20

30

40

50

60

70

80

90

100

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

5.9

6.3

VI − Input Voltage − V

ILED = 25 mA

ILED = 10 mA

ILED = 15 mA

ILED = 5 mA

TPS60231

SLVS544 – OCTOBER 2004

FIGURE

vs Input voltage (ILED = 25 mA, 15 mA, 10 mA, 5 mA per LED),

1

EN2 = 0, EN1 = 1

vs Input voltage (ILED = 25 mA, 15 mA, 10 mA, 5 mA per LED), EN2 =

2

η Efficiency

1, EN1 = 0

vs Input voltage (ILED = 25 mA, 15 mA, 10 mA, 5 mA per LED),

3

EN2 = EN1 = 1

IQ Quiescent current

vs Input voltage (TA = –40°C, 25°C, 85°C) (measured with ID1 = 5 mA)

4

Maximum output current from charge pump

vs Input voltage (TA = –40°C, 25°C, 85°C)

5

stage

fs

Switching frequency

vs Free-Air Temperature (TA = -40°C to 85°C, VI = 3.6 V)

6

vs Duty cycle on PWM (ILED max set to 20 mA)

7

LED current, ILED

For f = 32 kHz and f = 1 kHz, DC = 1% to 100%, VI = 3.6 V

VI and ID1 vs time on scope, LED current at D1 with

8

Line transient response

VI = 4.2 V to 3.6 V to 4.2 V with EN2 = EN1 = 11, 3 x 20 mA

PWM signal and current at D1 vs time on scope

9, 10

Dimming response

f = 32 kHz and f = 1 kHz, VI = 3.6 V, duty cycle = 50%,

EN1 = EN2 = PWM

VI = 3.6 V, 3 x 20 mA, EN1 = EN2 = 00 changed to

11

Startup timing

EN2 = EN1 = 11

EFFICIENCY

vs

INPUT VOLTAGE

Figure 1.

Figure 2.

6

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