Product # PQ48050HKA20

Phone 1-888-567-9596

Doc.# 005-2HK450G Rev. C

4/9/03

Page 3

Half

Half

Brick

Brick

Technical Specification

48Vin 5.0Vout 20A

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

< 10µs

Isolation Voltage (input to output)

2000

V

Basic insulation level, Pollution degree 2

Operating Temperature

-40

100

°C

Storage Temperature

-55

125

°C

Voltage at ON/OFF input pin

-2

18

V

Voltage at Clock Sync pin

-15

18

V

applies to Full Feature option only

INPUT CHARACTERISTICS

Operating Input Voltage Range

35

48

75

V

Input Under-Voltage Lockout

Turn-On Voltage Threshold

31.5

33.3

34.4

V

Turn-Off Voltage Threshold

29.5

31.0

32.4

V

Lockout Hysteresis Voltage

2.2

2.3

2.4

V

Input Over-Voltage Shutdown

76.7

78.3

79.5

V

Maximum Input Current

3.3

A

100% Load, 35 Vin

No-Load Input Current

75

95

mA

Disabled Input Current

2

5

mA

Inrush Current Transient Rating

0.03

Response to Input Transient

TBD

mV

1000V/ms input transient

Input Reflected-Ripple Current

3

mA

RMS thru 10µH inductor; Figs. 13 & 15

Recommended Input Fuse

20

A

fast blow external fuse recommended

1.6\4\3.3

µF\µH\µF internal values, see Figure E

Recommended External Input Capacitance

33

47

µF

see Figure 13

OUTPUT CHARACTERISTICS

Output Voltage Set Point

4.95

5.00

5.05

V

Output Voltage Regulation

Over Line

+0.05 \ 3

+0.1 \ 5

%\mV

Over Load

+0.1 \ 5

+0.2 \ 10

%\mV

Over Temperature

+15

+30

mV

Total Output Voltage Range

4.91

5.10

V

over sample, line, load, temperature & life

Output Voltage Ripple and Noise

20MHz bandwidth; Fig. 13 & 16

Peak-to-Peak

50

100

mV

Full Load, see Figures 13 & 16

RMS

10

20

mV

Full Load, see Figures 13 & 16

Operating Output Current Range

0

20

A

Output DC Current-Limit Inception

21

23

25

A

Output Voltage 10% Low; Fig. 17

Output DC Current-Limit Shutdown Voltage

2.8

V

Current Share Accuracy (2 units paralleled)

+2

+5

%

% of rated output current

Back-Drive Current Limit while Enabled

0.5

1.0

2.0

A

Max negative current drawn from output

Back-Drive Current Limit while Disabled

0

10

50

mA

Max negative current drawn from output

Maximum Output Capacitance

>50,000

µF

5.0Vout at 20A Resistive Load

DYNAMIC CHARACTERISTICS

Input Voltage Ripple Rejection

80

dB

120 Hz; Fig. 20

Output Voltage during Load Current Transient

Step Change in Output Current (0.1A/µs)

100

mV

50% to 75% to 50% Iout max; Figure 11

Step Change in Output Current (5A/µs)

100

mV

50% to 75% to 50% Iout max; Figure 12

Settling Time

300

µs

to within 1% Vout nom

Turn-On Transient

Turn-On Time

20

30

ms

Full load, Vout=90% nom.; Figs. 9 & 10

Start-Up Inhibit Time

180

200

215

ms

-40°C to +125°C; Figure A

Output Voltage Overshoot

0

%

10,000 µF load capacitance, Iout = 0A

EFFICIENCY

100% Load

88

%

Figures 1 - 4

50% Load

89

%

Figures 1 - 4

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

125

°C

See Figures 5 - 8 for derating curves

ISOLATION CHARACTERISTICS

Isolation Voltage

2000

V

Isolation Resistance

10

M

Ω

Isolation Capacitance

3300

pF

PQ48050HKA20 ELECTRICAL CHARACTERISTICS

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