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LTC3862 Datasheet(PDF) 21 Page - Linear Technology |
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LTC3862 Datasheet(HTML) 21 Page - Linear Technology |
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21 / 40 page  LTC3862 21 3862fb OPERATION Figure 13. Leading Edge Blanking Effects on the Minimum On-Time Figure 14. SW Node Waveforms with Different Duty Cycle Limits SW NODE 20V/DIV GATE 2V/DIV 200ns/DIV MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = SGND VIN = 30V VOUT = 48V MEASURED ON-TIME = 180ns VIN = 30V VOUT = 48V MEASURED ON-TIME = 260ns VIN = 30V VOUT = 48V MEASURED ON-TIME = 340ns INDUCTOR CURRENT 1A/DIV SW NODE 20V/DIV GATE 2V/DIV INDUCTOR CURRENT 1A/DIV SW NODE 20V/DIV GATE 2V/DIV INDUCTOR CURRENT 1A/DIV 200ns/DIV MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = FLOAT 200ns/DIV 3862 F13 MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = 3V8 SW NODE 10V/DIV SW NODE 10V/DIV 1μs/DIV 96% MAXIMUM DUTY CYCLE WITH DMAX = SGND INDUCTOR CURRENT 2A/DIV 1μs/DIV 84% MAXIMUM DUTY CYCLE WITH DMAX = FLOAT INDUCTOR CURRENT 2A/DIV SW NODE 10V/DIV INDUCTOR CURRENT 2A/DIV 1μs/DIV 3862 F14 75% MAXIMUM DUTY CYCLE WITH DMAX = 3V8 In order to satisfy these different applications require- ments, the LTC3862 has a simple way to program the maximum duty cycle. Connecting the DMAX pin to SGND limits the maximum duty cycle to 96%. Floating this pin limits the duty cycle to 84% and connecting the DMAX pin to the 3V8 supply limits it to 75%. Figure 14 illustrates the effect of limiting the maximum duty cycle on the SW node waveform of a boost converter. The LTC3862 contains an oscillator that runs at a multiple of the switching frequency, in order to provide for 2-, 3-, 4-, 6- and 12-phase operation. A digital counter is used to divide down the fundamental oscillator frequency in order to obtain the operating frequency of the gate drivers. Since the maximum duty cycle limit is obtained from this digital counter, the percentage maximum duty cycle does not vary with process tolerances or temperature. |
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