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10396-T022 Datasheet(PDF) 11 Page - Linear Technology |
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10396-T022 Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page LT8300 11 8300f applicaTions inForMaTion Figure 4. Output Power for 24V Output Figure 1. Output Power for 3.3V Output Figure 2. Output Power for 5V Output Figure 3. Output Power for 12V Output INPUT VOLTAGE (V) 0 3.5 2.5 1.5 3.0 2.0 1.0 0.5 0 40 80 20 60 8300 F01 100 N = 12:1 MAXIMUM OUTPUT POWER N = 8:1 N = 6:1 N = 4:1 INPUT VOLTAGE (V) 0 3.5 2.5 1.5 3.0 2.0 1.0 0.5 0 40 80 20 60 8300 F02 100 MAXIMUM OUTPUT POWER N = 2:1 N = 4:1 N = 6:1 N = 8:1 INPUT VOLTAGE (V) 0 3.5 2.5 1.5 3.0 2.0 1.0 0.5 0 40 80 20 60 8300 F03 100 N = 4:1 MAXIMUM OUTPUT POWER N = 3:1 N = 2:1 N = 1:1 INPUT VOLTAGE (V) 0 3.5 2.5 1.5 3.0 2.0 1.0 0.5 0 40 80 20 60 8300 F04 100 N = 1:1 N = 3:2 N = 1:2 MAXIMUM OUTPUT POWER N = 2:1 Primary Inductance Requirement The LT8300 obtains output voltage information from the reflected output voltage on the SW pin. The conduction of secondary current reflects the output voltage on the primarySWpin.Thesample-and-holderroramplifierneeds aminimum350nstosettleandsamplethereflectedoutput voltage. In order to ensure proper sampling, the second- ary winding needs to conduct current for a minimum of 350ns. The following equation gives the minimum value for primary-side magnetizing inductance: LPRI ≥ tOFF(MIN) •NPS • VOUT + VF ( ) ISW(MIN) tOFF(MIN) = Minimum switch-off time = 350ns ISW(MIN) = Minimum switch current limit = 52mA In addition to the primary inductance requirement for the minimum switch-off time, the LT8300 has minimum switch-on time that prevents the chip from turning on the power switch shorter than approximately 160ns. This minimumswitch-ontimeismainlyforleading-edgeblank- ing the initial switch turn-on current spike. If the inductor current exceeds the desired current limit during that time, oscillation may occur at the output as the current control loopwillloseitsabilitytoregulate.Therefore,thefollowing equation relating to maximum input voltage must also be followedinselectingprimary-sidemagnetizinginductance: LPRI ≥ tON(MIN) • VIN(MAX) ISW(MIN) tON(MIN) = Minimum Switch-On Time = 160ns |
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