FGLD12SR6040A datasheet(7/38 Pages) ETC2

Part #	FGLD12SR6040A

Description	4.5-14.4Vdc Input, 40A, 0.45-2.0Vdc Output

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Delivering Next Generation Technology

Series

FGLD12SR6040*A

4.5-14.4Vdc Input, 40A, 0.45-2.0Vdc Output

Http://www.fdk.com

Ver 1.6 Apr. 24, 2013

Preliminary Data Sheet

Design Considerations

Input Filtering

The

FGLD12SR6040*A

converter

should

be

connected to a low ac-impedance source. A highly

inductive source can affect the stability of the module.

An input capacitance must be placed directly adjacent

to the input pin of the module, to minimize input ripple

voltage and ensure module stability.

To minimize input voltage ripple, ceramic capacitors

are recommended at the input of the module. Fig-1

shows the input ripple voltage for various output

voltages at 40A of load current with 4x47uF, 6x47uF

or 8x47uF ceramic capacitors and an input of 12V.

Output Filtering

The FGLD12SR6040*A is designed for low output

ripple voltage and will meet the maximum output

ripple specification with 0.1uF ceramic and 47uF

ceramic capacitors at the output of the module.

However, additional output filtering may be required

by the system designer for a number of reasons. First,

there may be a need to further reduce the output

ripple and noise of the module. Second, the dynamic

response characteristics may need to be customized

to a particular load step change.

To reduce the output ripple and improve the dynamic

response to a step load change, additional

capacitance at the output can be used. Low ESR

polymer and ceramic capacitors are recommended to

improve the dynamic response of the module. Fig-2

provides output ripple information for different

external capacitance values at various Vo and a full

load current of 40A. For stable operation of the

module, limit the capacitance to less than the

maximum output capacitance as specified in the

electrical specification table. Optimal performance of

the module can be achieved by using the Tunable

Loop™ feature described later in this data sheet.

Safety Consideration

For safety agency approval the power module must

be installed in compliance with the spacing and

separation requirements of the end-use safety agency

standards, i.e., UL 60950-1 2nd, CSA C22.2 No.

60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805

Teil 1 + A11):2009-11; EN 60950-1:2006 +

A11:2009-03. (Pending)

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the

input must meet SELV requirements. The power

module has extra-low voltage (ELV) outputs when all

inputs are ELV.

The input to these units is to be provided with a fast

acting fuse with a maximum rating of 30A, 100V (for

example, Littlefuse 456 series) in the positive input

lead.

.

Fig-1: Input ripple voltage for various output

voltages

with

various

external

ceramic

capacitors at the input (40A load). Input voltage

is 12V. Scope Bandwidth limited to 20MHz.

50

100

150

200

250

300

350

400

0.6

0.8

1

1.2

1.4

1.6

1.8

2

Output Voltage (Volts)

4x22uF Ext Cap

6x22uF Ext Cap

8x22uF Ext Cap

Fig-2: Output ripple voltage for various output

voltages with external 6x47uF, 8x47uF or

10x47uF ceramic capacitors at the output (40A

load). Input voltage is 12V. Scope Bandwidth

limited to 20MHz.

0

10

20

30

40

0.6

0.8

1

1.2

1.4

1.6

1.8

2

Output Voltage(Volts)

6x47uF Ext Cap

8x47uF Ext Cap

10x47uF Ext Cap

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