Test Procedure for the NCP1339C Evaluation Board 1 • Yann Vaquette • May-14 Confidential Proprietary Board Electrical Schematic Gnd NCP1339 demoboard 19 V / 45 W C1 2.2nF Dc output voltage ON Semiconductor C11 1.5n R1 18k C4 120u R4 2.7k R2 18k R20 47 R3 10 R5 2.7k C18 220p - + TO -220 IN D1 MRA4007 R53 2.2M R11 300k R7 4.7M C5 1n L2 10mH / 2A IC1 NCP1339C C8 22p R12 1.5k C6 1n C2 330nF D3 MMSD4148 C14 220p C7 2.2n R9 10M 1 14 2 13 3 12 4 11 5 10 6 9 7 8 D12 MBR20H150 . D7 1N4937 D6 1N4937 C28 22u . . D10 BAV21 C19 680uF C20 680uF 35V 35V IC4x OptoBase C9 1n R13 NTC C29 10n R54 8.2M C13 1n Gnd 35V Gnd PSM R23 27k R21 1k C12 100u J3 IC4 OptoDiode R15 10 IPA60R385 D9 MMSD4148 C16 100p R22 10k R25 39k C15 100n Q1 BC857 IC5 NCP431 R16 47k R17 0.47 R18 0.62 IC6 OptoDiode SFH6156-2 R27 0 F1 2A / 250V R42 0R R29 10k J1 Gnd 85-265 V rms Ac input voltage 2 • Yann Vaquette • May-14 Confidential Proprietary R40 1k SFH6156-2 C27 47n R14 1k C10 220p 19 V / 2.4 A C21 100uF T1 M1 IC6x OptoBase D4 MMSD4148 L1 10m R52 0R R10 20k R8 4.7M D2 MRA4007 C3 220nF D5 18V R6 5.6M IC2 KBU4K Vout L3 2.2u Board Picture Isolated output Live parts, lethal voltages Input voltage from 85 V rms to 265 V rms 3 • Yann Vaquette • May-14 Confidential Proprietary Output voltage is 19 V, nominal current is 2.4 A Needed Equipment The needed equipements are the following: An ac source (85 to 265 V rms, 60 / 50 Hz), needed power is below 100 W An input ac watt-meter, up to 100 W A dc load absorbing up to 50 V, Vin(max) < 30 V, Iout(max) < 5 A Usually, dc electronic load can display dc V and dc A. If not, an voltmeter and ampmeter will be needed Dc voltage source for PSM mode If the load does not use local Kelvin sensors, then the output voltage must be measured at the board level, not at the cable ends. 4 • Yann Vaquette • May-14 Confidential Proprietary Connecting the Board for Testing Watt-meter Input power 19 V Ac source 85 to 265 V rms 5 • Yann Vaquette • May-14 5 V voltage source (J3) - 5 V PSM disabled - 0 V PSM enabled Confidential Proprietary Electronic load Test n°1: Power Savings Mode (PSM) Apply the input voltage 90 V rms to J1 connector 5 V voltage source on J3 connector is turned OFF Electronic load is disconnected or set to no load Check that output voltage is not regulated to 19 V Verify that average input power is below 20 mW (integration during 2h at least) vOUT(t) Apply the input voltage to 230 V rms Repeat above steps 6 • Yann Vaquette • May-14 Confidential Proprietary vDRV(t) Test n°2: No-load Standby Apply the input voltage 90 V rms to J1 connector 5 V voltage source on J3 connector is turned ON Electronic load is disconnected or set to no load Check that output voltage is 19 V (±5%) Verify that input power is below 45 mW Apply the input voltage to 230 V rms Repeat above steps Input power must be below 55 mW 7 • Yann Vaquette • May-14 Confidential Proprietary Test n°3: Nominal Power Apply the input voltage 90 V rms to J1 connector 5 V voltage source on J3 connector is turned ON Connect electronic load to J2 connector Load is set to 2.4 A Check that output voltage is 19 V (±5%) Verify that input power is: 45 W < Pin < 60 W Apply the input voltage to 265 V rms Repeat above steps 8 • Yann Vaquette • May-14 Confidential Proprietary Test n°4: Maximum Power Apply the input voltage 90 V rms to J1 connector 5 V voltage source on J3 connector is turned ON Connect electronic load to J2 connector Load is increased over nominal current (2.4 A) At a certain point, Iout(max), Vout collapses and the converter enters in auto-recovery mode (typical is 2.8 A) Maximum output current is: 2.6 A < Iout(max) < 3.5 A Apply the input voltage to 265 V rms Repeat above steps Iout(max) is now typically 3.3 A 9 • Yann Vaquette • May-14 Confidential Proprietary Test n°5: Short-circuit Apply the input voltage 90 V rms to J1 connector 5 V voltage source on J3 connector is turned ON Short-circuit is applied at the output via the electronic load for instance Load is increased over nominal current (2.4 A) Vout must collapse and the converter enters in autorecovery mode Verify that average input power is below 5 W Apply the input voltage to 265 V rms Repeat above steps 10 • Yann Vaquette • May-14 Confidential Proprietary