LT3498EDDB 查看數據表（PDF） - Linear Technology
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LT3498EDDB
Linear Technology
LT3498EDDB Datasheet PDF : 24 Pages
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LT3498
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
LED Switching Waveforms
LED Transient Response
VSW
10V/DIV
VCAP1
50mV/DIV
IL
100mA/
DIV
500ns/DIV
VIN = 3.6V
FRONT PAGE APPLICATION
VCAP1
5V/DIV
VCTRL1
5V/DIV
3498 G19
IL
200mA/
DIV
1ms/DIV
VIN = 3.6V
FRONT PAGE APPLICATION
OLED Switching Waveforms
with No Load
VOUT2
10mV/DIV
AC COUPLED
SW2 VOLTAGE
10V/DIV
3498 G20
INDUCTOR
CURRENT
50mA/DIV
VIN = 3.6V
VOUT2 = 16V
5μs/DIV
3498 G21
OLED Switching Waveforms
with 4mA Load
VOUT2
10mV/DIV
AC
COUPLED
SW2
VOLTAGE
10V/DIV
OLED Switching Waveforms
with 35mA Load
VOUT2
10mV/DIV
AC COUPLED
SW2
VOLTAGE
10V/DIV
INDUCTOR
CURRENT
200mA/DIV
VIN = 3.6V
VOUT2 = 16V
2μs/DIV
3498 G22
INDUCTOR
CURRENT
200mA/DIV
VIN = 3.6V
VOUT2 = 16V
500ns/DIV
3498 G23
OLED Switching Waveforms
During Start-Up
CAP2
VOLTAGE
5V/DIV
VOUT2
VOLTAGE
5V/DIV
INDUCTOR
CURRENT
100mA/DIV
VIN = 3.6V
VOUT2 = 16V
500μs/DIV
3498 G24
PIN FUNCTIONS
LED1 (Pin 1): Connection Point Between the Anode of the
Highest LED and the Sense Resistor. The LED current can
be programmed by:
ILED1
=
200mV
RSENSE1
CTRL1 (Pin 2): Dimming and Shutdown Pin. Connect this
pin below 75mV to disable the white LED driver. As the
pin voltage is ramped from 0V to 1.5V, the LED current
ramps from 0 to (ILED1 = 200mV / RSENSE1).
GND1, 2 (Pins 3, 4): Ground. Tie directly to local ground
plane. GND1 and GND2 are connected internally.
6
CTRL2 (Pin 5): Dimming and Shutdown Pin. Connect
it below 75mV to disable the low noise boost converter.
As the pin voltage is ramped from 0V to 1.5V, the output
ramps up to the programmed output voltage.
FB2 (Pin 6): Feedback Pin. Reference voltage is 1.215V.
There is an internal 182kΩ resistor from FB2 to GND. To
achieve desired output voltage, choose RFB2 according to
the following formula:
RFB2
= 182
•
VOUT2
1.215
1
k
3498fa
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