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LT3466-1
OPERATIO
In the event one of the converters has an output open-circuit,
its output voltage will be clamped at 39.5V. 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 driving the OLED display. Con-
verter 1 starts switching at a lower inductor current and
begins skipping pulses, thereby reducing its input current.
Converter 2 continues functioning properly.
V OUT1
10V/DIV
I L1
Soft-Start
The LT3466-1 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 six
LEDs at 20mA. The filtered input current, as shown in
Figure 5, is well controlled. The soft-start circuitry is less
effective when driving a higher number of LEDs.
200mA/DIV
Undervoltage Lockout
200 μ s/DIV
34661 F04a
The LT3466-1 has an undervoltage lockout circuit which
LED1 DISCONNECTED AT THIS POINT
V IN = 3.3V
CIRCUIT OF FIGURE 1
Figure 4a. Transient Response of Switcher 1 with LED1
Disconnected from the Output
V SW1
50V/DIV
I L1
100mA/DIV
V SW2
50V/DIV
I L2
100mA/DIV
shuts down both converters when the input voltage drops
below 2.1V (typ). This prevents the converter from switch-
ing in an erratic mode when powered from low supply
voltages.
I IN
200mA/DIV
V OUT1
20V/DIV
V FB1
200mV/DIV
CTRL1
5V/DIV
V IN = 3.6V
1 μ s/DIV
34661 F04b
V IN = 3.6V
6 LEDs, 20mA
200 μ s/DIV
34661 F05
CIRCUIT OF FIGURE 1
Figure 4b. Output 1 Open-Circuit Waveforms
CIRCUIT OF FIGURE 1
Figure 5. Start-Up Waveforms
34661f
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