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LT3466
OPERATIO
However, the other converter will continue functioning
properly. The photo in Figure 4b shows circuit operation
with converter 1 output open-circuit and converter 2 driv-
ing eight LEDs at 20mA. Converter 1 starts switching at a
lower peak inductor current and begins skipping pulses,
thereby reducing its input current.
V OUT1
10V/DIV
I L1
200mA/DIV
Soft-Start
The LT3466 has a separate internal soft-start circuitry for
each converter. Soft-start helps to limit the inrush current
during start-up. Soft-start is achieved by clamping the
output of the error amplifier during the soft-start period.
This limits the peak inductor current and ramps up the
output voltage in a controlled manner.
The converter enters into soft-start mode whenever the
respective CTRL pin is pulled from low to high. Figure 5
shows the start-up waveforms with converter 1 driving
four LEDs at 20mA. The filtered input current, as shown in
Figure 5, is well controlled. The soft-start circuit is less
effective when driving a higher number of LEDs.
200 μ s/DIV
LED1 DISCONNECTED AT THIS INSTANT
V IN = 3.3V
CIRCUIT OF FIGURE 1
3466 F04a
Undervoltage Lockout
The LT3466 has an undervoltage lockout circuit which
Figure 4a. Transient Response of Switcher 1 with LED1
Disconnected from the Output
I L1
50mA/DIV
V SW1
50V/DIV
I L2
100mA/DIV
V SW2
50V/DIV
shuts down both the converters when the input voltage
drops below 2.1V (typ). This prevents the converter from
operating in an erratic mode when powered from low
supply voltages.
I IN
100mA/DIV
V OUT1
5V/DIV
V FB1
200mV/DIV
CRTL1
2V/DIV
V IN = 3.3V
CIRCUIT OF FIGURE 1
LED1 DISCONNECTED
1 μ s/DIV
3466 F04b
V IN = 3.6V
4 LEDs, 20mA
L = 15 μ H
C = 0.47 μ F
100 μ s/DIV
3466 F05
Figure 4b. Switching Waveforms with Output 1 Open-Circuit
Figure 5. Start-Up Waveforms
3466fa
9
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