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LT3466-1 Datasheet(PDF) 9 Page - Linear Technology |
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LT3466-1 Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LT3466-1 34661f 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. 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. Undervoltage Lockout The LT3466-1 has an undervoltage lockout circuit which 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. OPERATIO Figure 4a. Transient Response of Switcher 1 with LED1 Disconnected from the Output Figure 4b. Output 1 Open-Circuit Waveforms Figure 5. Start-Up Waveforms VOUT1 10V/DIV 200 µs/DIV LED1 DISCONNECTED AT THIS POINT VIN = 3.3V CIRCUIT OF FIGURE 1 34661 F04a IL1 200mA/DIV VOUT1 20V/DIV VFB1 200mV/DIV 200 µs/DIV VIN = 3.6V 6 LEDs, 20mA CIRCUIT OF FIGURE 1 34661 F05 IIN 200mA/DIV CTRL1 5V/DIV VSW1 50V/DIV VSW2 50V/DIV 1 µs/DIV VIN = 3.6V CIRCUIT OF FIGURE 1 34661 F04b IL1 100mA/DIV IL2 100mA/DIV |
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