Q48SG12034NRFA datasheet(8/27 Pages) DELTA

Part #	Q48SG12034NRFA

Description	Delphi Series Q48SG Quarter Brick Family Full Digital Control DC/DC Power Modules

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Manufacturer	DELTA [Delta Electronics, Inc.]

Direct Link	http://www.deltaww.com

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DS_Q48SG12034_06272013

8

For parallel application

Cin is 100uF low ESR Aluminum cap x 2pcs in parallel;

CX1 is 2.2uF ceramic cap×2pcs in parallel;

CX2 is 2.2uF ceramic cap;

CY1 is 47nF ceramic cap x 2pcs in parallel;

CY2 is 47nF ceramic cap x 2pcs in parallel;

CY is 3.3nF ceramic cap;

L1 is Pulse P0469NL (0.63mH/11.6A) x 2pcs in parallel;

L2 is Pulse P0469NL (0.63mH/11.6A) x 2pcs in parallel;

Test Result: Vin=48V, Io=68A

1 MHz

10 MHz

150 kHz

30 MHz

10.0

20.0

30.0

40.0

50.0

60.0

70.0

0.0

80.0

dBμV

Limits

55022MQP

55022MAV

Transducer

8130

Traces

PK+

AV

The blue line is quasi peak mode and the green one is

average mode.

DESIGN CONSIDERATIONS

Input Source Impedance

The impedance of the input source connecting to the

DC/DC power modules will interact with the modules and

affect the stability. A low ac-impedance input source is

recommended. If the source inductance is more than a

few μH, we advise adding a 100 to 200 μF electrolytic

capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the

input of the module to improve the stability.

Layout and EMC Considerations

Delta’s DC/DC power modules are designed to operate

in a wide variety of systems and applications. For design

assistance with EMC compliance and related PWB

la

yout issues, please contact Delta’s technical support

team. An external input filter module is available for

easier EMC compliance design. Below is the reference

design for an input filter tested with Q48SG120XXXXXX

to meet class B in CISSPR 22.

Schematic and Components List

For Single Module Application

Cin is 100uF low ESR Aluminum cap;

CX1 is 2.2uF ceramic cap×2pcs in parallel;

CX2 is 2.2uF ceramic cap;

CY1 and CY2 are 47nF ceramic cap;

CY is 3.3nF ceramic cap;

L1 and L2 are common-mode inductors, L1=L2=0.47mH;

Test Result: Vin=48V, Io=34A