VTM48EH020M040A00【PDF 9/16 页】HALF-CHIP VTM CURRENT MULTIPLIER

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VTM 48 EH 020 x 040A00

7.0 USING THE CONTROL SIGNALS VC, PC, TM, IM

The VTM Control (VC) pin is an input pin which powers the

internal VCC circuitry when within the specified voltage range

of 12 V to 16.5 V. This voltage is required in order for the VTM

module to start, and must be applied as long as the input is

below 26 V. In order to ensure a proper start, the slew rate of

the applied voltage must be within the specified range.

Some additional notes on the using the VC pin:

? In most applications, the VTM? module will be powered

by an upstream PRM which provides a 10 ms VC pulse

during startup. In these applications the VC pins of the PRM

and VTM should be tied together.

? The VC voltage can be applied indefinitely allowing for

continuous operation down to 0 V IN .

? The fault response of the VTM module is latching.

A positive edge on VC is required in order to restart the unit.

If VC is continuously applied the PC pin may be toggled

to restart the module.

Primary Control (PC) pin can be used to accomplish the

following functions:

? Delayed start: Upon the application of VC, the PC pin will

source a constant 100 μA current to the internal RC

network. Adding an external capacitor will allow further

delay in reaching the 2.5 V threshold for module start.

? Auxiliary voltage source: Once enabled in regular

operational conditions (no fault), each VTM PC provides a

regulated 5 V, 2 mA voltage source.

? Output disable: PC pin can be actively pulled down in order

to disable the module. Pull down impedance shall be lower

than 400 Ω .

? Fault detection flag: The PC 5 V voltage source is internally

turned off as soon as a fault is detected. It is important to

notice that PC doesn’t have current sink capability. Therefore,

in an array, PC line will not be capable of disabling

neighboring modules if a fault is detected.

? Fault reset: PC may be toggled to restart the unit if VC

is continuously applied.

Temperature Monitor (TM) pin provides a voltage

proportional to the absolute temperature of the converter

control IC.

It can be used to accomplish the following functions:

? Monitor the control IC temperature: The temperature in

Kelvin is equal to the voltage on the TM pin scaled

by 100. (i.e. 3.0 V = 300 K = 27 oC). If a heat sink is applied,

TM can be used to thermally protect the system.

? Fault detection flag: The TM voltage source is internally

turned off as soon as a fault is detected. For system

Current Monitor (IM) pin provides a voltage proportional to

the output current of the VTM module. The nominal voltage

will vary between 0.3 V and 1.64 V over the output current

range of the module (See Figures 8–10). The accuracy of the

IM pin will be within 25% under all line and temperature

conditions between 50% and 100% load.

8.0 STARTUP BEHAVIOR

Depending on the sequencing of the VC with respect to the

input voltage, the behavior during startup will vary as follows:

? Normal Operation (VC applied prior to V IN ): In this case the

controller is active prior to ramping the input. When the

input voltage is applied, the VTM output voltage will track

the input (See Figure 13). The inrush current is determined by

the input voltage rate of rise and output capacitance. If the

VC voltage is removed prior to the input reaching 26 V, the

VTM module may shut down.

? Stand Alone Operation (VC applied after V IN ): In this case the

module output will begin to rise upon the application of the

VC voltage (See Figure 14). The Adaptive Soft Start circuit

(See Section 10) may vary the ouput rate of rise in order to

limit the inrush current to it’s maximum level. When starting

into high capacitance, or a short, the output current will be

limited for a maximum of 900 μsec. After this period, the

adaptive soft start circuit will time out and the module

may shut down. No restart will be attempted until VC is

re-applied, or PC is toggled. The maximum output

capacitance is limited to 1500 μF in this mode of operation

to ensure a sucessful start.

9.0 THERMAL CONSIDERATIONS

VI Chip ? products are multi-chip modules whose temperature

distribution varies greatly for each part number as well as with

the input / output conditions, thermal management and

environmental conditions. Maintaining the top of the

VTM48EH020T040A00 case to less than 100 oC will keep all

junctions within the VI Chip ? below 125 oC for most

applications.

The percent of total heat dissipated through the top surface

versus through the J-lead is entirely dependent on the

particular mechanical and thermal environment. The heat

dissipated through the top surface is typically 60%. The heat

dissipated through the J-lead onto the PCB board surface is

typically 40%. Use 100% top surface dissipation when

designing for a conservative cooling solution.

It is not recommended to use a VI Chip ? module for an

extended period of time at full load without proper heat

sinking.

monitoring purposes (microcontroller interface) faults are

detected on falling edges of TM signal.

Rev. 2.1

VI CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200

6/2012

Page 9 of 16

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