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List of Materials

Table 2. EVM Components (shown in Figure 1) (continued)

COUNT REF DES DESCRIPTION PART NUMBER MFR

2 R25, R30 Resistor, chip, 1/8 W, 1%, 51.1 Ω, 0805 std std

1 R26 Resistor, chip, 1/8 W, 1%, 28.7 kΩ, 0805 std std

1 R27 Resistor, chip, 1/8 W, 1%, 12.1 kΩ, 0805 std std

1 R28 Resistor, chip, 1/8 W, 1%, 4.99 kΩ, 0805 std std

1 R3 Resistor, chip, 1/8 W, 1%, 88.7 kΩ, 0805 std std

1 R32 Resistor, chip, 1/8 W, 1%, 249 kΩ, 0805 std std

0 R35, R36 Resistor, chip, 1/8 W, 1%, open, 0805 std std

1 R37 Resistor, chip, 1/8 W, 1%, 9.09 kΩ, 0805 std std

R4, R10, R15, R16,

6 Resistor, chip, 1/8 W, 1%, 2.21 Ω, 0805 std std

R20, R23

1 R5 Resistor, chip, 1/8 W, 1%, 158 kΩ, 0805 std std

1 R6 Resistor, chip, 1/8 W, 1%, 1.82 kΩ, 0805 std std

3 R7, R8, R12 Resistor, chip, 1/8 W, 1%, 1.00 kΩ, 0805 std std

1 R9 Resistor, chip, 1/8 W, 1%, 4.64 Ω, 0805 std std

1 T1 Transformer, current sense, 10 A, 1:100, SMD P8208 Pulse

1 T2 Transformer, High Frequency Planar PA0810 Pulse

1 U1 Current-Mode Active Clamp PWM Controller, PW20 UCC2897APW TI

1 U2 Phototransistor, CTR 100%-300%, SOP4 SFH690BT Vishay

1 -- PCB, 3.6 In x 2.7 In x 0.062 In HPA348 Any

4 -- Rubber bumpon transparent, 0.44"x0.2", bumpon SJ5303 3M

SLUU357–November 2009 48-V to 3.3-V Forward Converter with Active Clamp Reset —Using the

UCC2897A Active Clamp Current Mode —PWM Controller

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