Product # DQ63318QMA04

Phone 1-888-567-9596

Doc.# 005-2DQ638H Rev. A

1/10/03

Page 3

Technical Specification

48Vin 3.3/1.8Vout 40W

Quarter

Quarter

Brick Dual

Brick Dual

Parameter

Min.

Typ.

Max.

Units

Notes & Conditions

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Non-Operating

100

V

continuous

Operating

80

V

continuous

Operating Transient Protection

100

V

100ms transient

Isolation Voltage (input to output)

2000

V

Basic level, Pollution Degree 2

Operating Temperature

-40

100

°C

Storage Temperature

-55

125

°C

Voltage at ON/OFF input pin

-2

18

V

INPUT CHARACTERISTICS

Operating Input Voltage Range

35

48

75

V

Input Under-Voltage Lockout

Turn-On Voltage Threshold

32

33

34

V

Turn-Off Voltage Threshold

28.5

29.5

30.5

V

Lockout Hysteresis Voltage

2.5

3.5

4.5

V

Maximum Input Current

1.7

A

100% Load, 35 Vin

No-Load Input Current

40

mA

Disabled Input Current

2.0

mA

Inrush Current Transient Rating

0.01

Response to Input Transient

150

mV

1000V/ms input transient

Input Reflected-Ripple Current

20

mA

RMS thru 10µH inductor; Figs. 23 & 25

Recommended Input Fuse

20

A

fast blow external fuse recommended

Input Filter Component Values (C\L)

2.0\4.7

µF\µH

internal values, see Figure E

Recommended External Input Capacitance

33

47

µF

see Figure 23

OUTPUT CHARACTERISTICS

Output Voltage Set Point (1.8V)

1.78

V

48Vin, 50% load on each voltage

Output Voltage Set Point (3.3V)

3.30

V

48Vin, 50% load on each voltage

Total Output Voltage Regulation (1.8V)

1.70

1.90

V

cross regulation, line, load, temp; Figs 7-10

Total Output Voltage Regulation (3.3V)

3.20

3.40

V

cross regulation, line, load, temp; Figs 7-10

Output Voltage Ripple and Noise (1.8V & 3.3V)

20MHz bandwidth; Fig. 23 & 26

Peak-to-Peak

50

100

mV

Full Load, see Figures 23 & 26

RMS

10

20

mV

Full Load, see Figures 23 & 26

Operating Output Current Range (1.8V)

0

22

A

Operating Output Current Range (3.3V)

0

12

A

Output DC Current-Limit Inception (1.8V)

27.0

A

Output Voltage 10% Low; Figs. 27-28

Output DC Current-Limit Inception (3.3V)

13.5

A

Output Voltage 10% Low; Figs. 27-28

Short-Circuit Protection - redundant shutdown (1.8V)

48

A

Figures 29-30

Short-Circuit Protection - redundant shutdown (3.3V)

28

A

Figures 29-30

0.95\1.98

V

1.3

A

Max negative current drawn from output

0.01

A

Max negative current drawn from output

50,000

µF

40W load; 5% overshoot at Vout at startup

35,000

µF

40W load; 5% overshoot at Vout at startup

DYNAMIC CHARACTERISTICS

65\60

dB

120 Hz; Figs. 33-34

Output Voltage during Load Current Transient

200

mV

50% to 75% to 50% Iout max; Figure 21

200

mV

50% to 75% to 50% Iout max; Figure 22

Settling Time

3

ms

to within 1% Vout nom

Turn-On Transient

Turn-On Time

4

8

ms

Full load, Vout=90% nom.; Figs. 19 & 20

Start-Up Inhibit Time

180

200

215

ms

-40°C to +125°C; Figure F

Output Voltage Overshoot

5

%

10mF load capacitance, Iout = 0A

EFFICIENCY

100% Load

83

%

48Vin, 50% load each Vout; Figures 1 - 6

50% Load

83

%

48Vin, 50% load each Vout; Figures 1 - 6

TEMPERATURE LIMITS FOR POWER DERATING CURVES

Semiconductor Junction Temperature

125

°C

Package rated to 150°C

Board Temperature

125

°C

UL rated max operating temp 130°C

Transformer Temperature

110

°C

See Figures 11 - 18 for derating curves

ISOLATION CHARACTERISTICS

Isolation Voltage

2000

V

Isolation Resistance

10

M

Ω

Isolation Capacitance

470

pF

DQ63318QMA04 ELECTRICAL CHARACTERISTICS

temperature with appropriate power derating. Specifications subject to change without notice.