AIC1648 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1648

Built-in OVP White LED Step-Up Converter

Analog Intergrations 

AIC1648

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

11.0

10.5

10.0

9.5

9.0

8.5

3 LEDs

ILED=20mA

8.0

7.5

6 Samples' Temperature Data

7.0

-40 -20 0

20 40 60 80 100

Temperature (°C)

Fig. 14 Output voltage vs. temperature

25

20

15

VIN=4.2V

10 VIN=3.6V

VIN=3.3V

5 VIN=2.5V

4 LEDs

0

-80 -60 -40 -20 0 20 40 60 80 100

Temperature (°C)

Fig. 15 LED Current vs. Temperature

BLOCK DIAGRAM

OVP

Over Voltage

Comparator

27V

+

-

PWM/PFM

Control

95mV

VIN

VREF

Error

+

AMP

Control

Driver

M1

Logic

+

*

-

PWM

Comparator

FB

-

1.2MHz

Slope

Oscillator

RC*

Compensation

CC

*

Internal

Soft Start

+

-

Current AMP.

RS*

SHDN

SW

GND

6

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