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V048T096T025 Datasheet(PDF) 5 Page - Vicor Corporation |
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V048T096T025 Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 11 page vicorpower.com 800-735-6200 VTM™ Current Multiplier V048F096T025 Rev. 2.9 Page 5 of 11 Pin / Control Functions +In / -In DC Voltage Ports The VTM™ current multiplier input should be connected to the PRM™ regulator output terminals. Given that both the regulator and current multiplier have high switching frequencies, it is often good practice to use a series inductor to limit high frequency currents between the PRM module output and VTM module input capacitors. The input voltage should not exceed the maximum specified. If the input voltage exceeds the overvoltage turn-off, the VTM module will shutdown. The VTM module does not have internal input reverse polarity protection. Adding a properly sized diode in series with the positive input or a fused reverse-shunt diode will provide reverse polarity protection. TM – For Factory Use Only VC – VTM Control The VC port is multiplexed. It receives the initial VCC voltage from an upstream PRM regulator, synchronizing the output rise of the VTM module with the output rise of the regulator. Additionally, the VC port provides feedback to the PRM to compensate for the current multiplier output resistance. In typical applications using VTM modules powered from PRM regulators, the regulators VC port should be connected to the VTM module VC port. The VC port is not intended to be used to supply V CC voltage to the VTM module for extended periods of time. If VC is being supplied from a source other than the PRM regulators, the voltage should be removed after 20 ms. PC – Primary Control The Primary Control (PC) port is a multifunction port for controlling the current multiplier as follows: Disable – If PC is left floating, the VTM module output is enabled. To disable the output, the PC port must be pulled lower than 2.4 V, referenced to -In. Optocouplers, open collector transistors or relays can be used to control the PC port. Once disabled, 14 V must be re-applied to the VC port to restart the VTM module. Primary Auxiliary Supply – The PC port can source up to 2.4 mA at 5 Vdc. +Out / -Out DC Voltage Output Ports The output and output return are through two sets of contact locations. The respective +Out and –Out groups must be connected in parallel with as low an interconnect resistance as possible. Within the specified input voltage range, the Level 1 DC behavioral model shown in Figure 16 defines the output voltage of the VTM module. The current source capability of the VTM module is shown in the specification table. To take full advantage of the VTM current multiplier, the user should note the low output impedance of the device. The low output impedance provides fast transient response without the need for bulk POL capacitance. Limited-life electrolytic capacitors required with conventional converters can be reduced or even eliminated, saving cost and valuable board real estate. -In PC VC TM +In -Out +Out -Out +Out Bottom View A B C D E F G H J K L M N P R T 4 3 2 1 A B C D E H J K L M N P R T Figure 9 — VTM™ current multiplier pin configuration Signal Name Pin Designation +In A1-E1, A2-E2 –In L1-T1, L2-T2 TM H1, H2 VC J1, J2 PC K1, K2 +Out A3-D3, A4-D4, J3-M3, J4-M4 –Out E3-H3, E4-H4, N3-T3, N4-T4 |
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