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LTC3809EMSE-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC3809EMSE-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page LTC3809 11 3809fc OPERATION (Refer to Functional Diagram) Peak Current Sense Voltage Selection and Slope Compensation (IPRG Pin) When the LTC3809 controller is operating below 20% duty cycle, the peak current sense voltage (between the VIN and SW pins) allowed across the external P-channel MOSFET is determined by: Δ= VA VV SENSE MAX ITH () • –. 07 10 where A is a constant determined by the state of the IPRG pin. Floating the IPRG pin selects A = 1; tying IPRG to VIN selects A = 5/3; tying IPRG to GND selects A = 2/3. The maximum value of VITH is typically about 1.98V, so the maximum sense voltage allowed across the external P- channel MOSFET is 125mV, 85mV or 204mV for the three respective states of the IPRG pin. However, once the controller’s duty cycle exceeds 20%, slope compensation begins and effectively reduces the peak sense voltage by a scale factor (SF) given by the curve in Figure 1. The peak inductor current is determined by the peak sense voltage and the on-resistance of the external P-channel MOSFET: I V R PK SENSE MAX DS ON = Δ () () DUTY CYCLE (%) 10 60 80 110 100 90 3809 F01 40 20 50 70 90 30 10 0 30 50 70 20 0 40 60 80 100 Figure 1. Maximum Peak Current vs Duty Cycle |
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