TPS60230RGTR datasheet(6/15 Pages) TI

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TYPICAL CHARACTERISTICS

Table of Graphs

100

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

5.9 6.3 6.5

ILED = 25 mA

ILED = 15 mA

ILED = 10 mA

VI − Input Voltage − V

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

5.9

6.3 6.5

ILED = 25 mA

ILED = 10 mA

ILED = 15 mA

VI − Input Voltage − V

TPS60230

SLVS516A – MAY 2004 – REVISED JUNE 2004

FIGURE

vs Input voltage (ILED = 25 mA, 15 mA, 10 mA per LED), EN2 = 0,

EN1 = 1, Show hysteresis (rising and falling VI), VLED = 3.1 V

vs Input voltage (ILED = 25 mA, 15 mA, 10 mA per LED), EN2 = 1,

η Efficiency

EN1 = 0, Show hysteresis (rising and falling VI), VLED = 3.1 V

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

EN2 = EN1 = 1, Show hysteresis (rising and falling VI), VLED = 3.1 V

IQ No load quiescent current

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

Maximum output current from charge pump stage vs Input voltage

Switching frequency

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

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

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, Show LED current at D1 with

Line transient response

VI = 4.2 V to 3.6 V to 4.2 V with EN2 = EN1 = 11, 5x20 mA

Show PWM signal and current at D1 vs time on scope

f = 32 kHz, VI = 3.6 V, duty cycle = 50%, EN1 = EN2 = PWM

Dimming response

Show PWM signal and current at D1 vs time on scope

f = 1 kHz, VI = 3.6 V, duty cycle = 50%, EN1 = EN2 = PWM

Startup timing

VI = 3.6 V, 5x20 mA, EN1 = EN2 = 00 changed to EN2 = EN1 = 11

EFFICIENCY

INPUT VOLTAGE

Figure 1.

Figure 2.

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