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V048F020T080 Datasheet(PDF) 9 Page - Vicor Corporation |
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V048F020T080 Datasheet(HTML) 9 Page - Vicor Corporation |
9 / 14 page vicorpower.com 800-735-6200 V•I Chip Pre-Regulator Module P048F048T12AL Rev. 1.0 Page 9 of 14 PRELIMINARY L O A D -In PC VC TM +In -Out +Out VTM +Out -Out K Ro +Out –Out +In –In VC PC TM IL VH PR NC SG SC PRM-AL OS NC CD Factorized Bus (Vf) (IL•Ro) K Vf = V L + K Vin ROS RCD 0.4 μH Output Voltage Setting with Adaptive Loop The equations for calculating ROS and RCD to set a VTM output voltage are: 93100 ROS = ( V L • 0.8395 ) – 1 (1) K RCD = 91238 + 1 (2) ROS VL = Desired load voltage VOUT = VTM output voltage K = VTM transformation ratio (available from appropriate VTM data sheet) Vf = PRM output voltage, the Factorized Bus (see Figure 16) RO = VTM output resistance (available from appropriate VTM data sheet) IL = Load Current (actual current delivered to the load) Output Voltage Trimming (optional) After setting the output voltage from the procedure above the output may be margined down (26Vf min) by a resistor from SC-SG using this formula: RdΩ = 10000 Vfd Vfs - Vfd Where Vfd is the desired factorized bus and Vfs is the set factorized bus. A low voltage source can be applied to the SC port to margin the load voltage in proportion to the SC reference voltage. An external capacitor can be added to the SC port as shown in Figure 16 to control the output voltage slew rate for soft start. Figure 16 — Adaptive Loop compensation with soft start using the SC port. Nominal Vout VTM Range (Vdc) K Factor 0.8 ↔ 1.6 1/32 1.1 ↔ 2.2 1/24 1.6 ↔ 3.3 1/16 2.2 ↔ 4.4 1/12 3.3 ↔ 6.6 1/8 4.3 ↔ 8.8 1/6 6.5 ↔ 13.4 1/4 8.7 ↔ 17.9 1/3 13.0 ↔ 26.9 1/2 17.4 ↔ 36.0 2/3 26.0 ↔ 54.0 1 Table 2 — 048 input series VTM K factor selection guide Application Information V•I Chip Pre-Regulator Module |
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