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LT3472EDD Datasheet(PDF) 8 Page - Linear Technology |
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LT3472EDD Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page LT3472 8 3472f and larger capacitance, which can cause significant switch- ing losses at 1.1MHz switching frequency. Some recom- mended Schottky diodes are listed in Table 4. Table 4. Recommended Schottky Diodes Forward Forward Diode Current Voltage Capacitance Part No. (mA) Drop (V) (pF) Manufacturer CMDSH-3 100 0.58 @100mA 7 @ 10V Central Semiconductor CMDSH2-3 200 0.49 @ 200mA 15 @ 10V (631) 435-1110 www.centralsemi.com Setting the Output Voltages The LT3472 has an accurate feedback resistor of 50k for each channel. Only one resistor is needed to set the output voltage for each channel. The output voltage can be set according to the following formulas: V R k V R k POS NEG =+ ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ = ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ 125 1 1 50 125 2 50 .• –. • Figure 4a. VSSP, VPOS, IIN with 100nF on SSP Figure 4b. VSSP, VPOS, IIN with SSP Open Figure 5a. VSSN, VNEG, IIN with 100nF on SSN In order to maintain accuracy, high precision resistors are preferred (1% is recommended). Soft-Start The LT3472 has independent soft-start control for each channel. As shown in Figure 1, the SSP and SSN pins have an internal resistor of 50k pulling up to 1.25V, respec- tively. By connecting a capacitor from the SSP or SSN pin to ground, the ramp of each output can be programmed individually. If SSP or SSN is open or pull higher than 1.25V, the corresponding output will ramp up quickly. The waveforms with and without soft-start for the Boost channel are shown in Figure 4. The waveforms with and without soft-start for the negative channel are shown in Figure 5. Start Sequencing The LT3472 has internal sequencing circuitry that inhibits the negative channel from operating until feedback voltage of the step-up channel reaches about 1.1V, ensuring that APPLICATIO S I FOR ATIO Figure 5b. VSSN, VNEG, IIN with SSN Open VSSP 2V/DIV VPOS 5V/DIV IIN 200mA/DIV 100µs/DIV 3472 FO4b VSSN 1V/DIV VNEG 5V/DIV IIN 100mA/DIV 500µs/DIV 3472 FO5a VSSN 2V/DIV VNEG 5V/DIV IIN 200mA/DIV 100µs/DIV 3472 FO5b VSSP 1V/DIV VPOS 5V/DIV IIN 100mA/DIV 1ms/DIV 3472 FO4a |
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