Product # BQ50120QTA20

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ512J Rev. E

03/17/06

Page 3

Input:

Input:

Output:

Output:

Current:

Current:

ackage:

42-53 V

42-53 V

12 V

12 V

20 A

20 A

Quarter-brick

Quarter-brick

T

pecification

Parameter

Min.

Typ.

Max.

Units

Notes & Conditions

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Non-Operating

60

V

Continuous

Operating

56

V

Continuous

Isolation Voltage (input to output)

2000

V

Basic insulation, Pollution Degree 2

Operating Temperature

-40

100

°C

Storage Temperature

-55

125

°C

Voltage at ON/OFF input pin

-2

12

V

INPUT CHARACTERISTICS

Operating Input Voltage Range

42

48

53

V

Input Under-Voltage Lockout

Turn-On Voltage Threshold

39.5

V

Turn-Off Voltage Threshold

38.0

V

Lockout Voltage Hysteresis

1.5

V

Input Over-Voltage Shutdown

Turn-Off Voltage Threshold

55.0

V

Vin when unit will shut down

Turn-On Voltage Threshold

54.0

V

Vin when unit turns on after shutdown event

Maximum Input Current

6.3

A

100% Load, 42 Vin

No-Load Input Current

0.17

A

Disabled Input Current

7.5

15

mA

Inrush Current Transient Rating

0.01

Input Reflected-Ripple Current

5

mA

RMS through 10µH inductor; Figures 12 & 14

Input Terminal-Ripple Current

75

100

mA

RMS, full load; Figures 12 & 13

12

A

Fast blow external fuse recommended

Input Filter Component Values (C\L\C)

1\1.5\2

µF\µH\µF Internal values

Recommended External Input Capacitance

47

µF

Typical ESR 0.1-0.2

Ω, see Figure 12

OUTPUT CHARACTERISTICS

Output Voltage Set Point

12.00

V

48Vin, no load

Output Voltage Regulation

Over Line

+10 \ 1.2

%\V

Figure 4

Over Load

+4.1 \ 500

%\mV

Figure 4

Over Temperature

+1.7 \ 200

%\mV

Figure 4

Total Output Voltage Range

9.7

13.3

V

Over sample, line, load, temperature & life

20MHz bandwidth; Figures 12 & 15

Peak-to-Peak

30

60

mV

Full Load, see Figures 12 & 15

RMS

15

20

mV

Full Load, see Figures 12 & 15

Operating Output Current Range

0

20

A

Subject to thermal derating; Figures 5 - 8

Output DC Current-Limit Inception

24.8

A

Output Voltage 10% Low; Figure 16

Output DC Current-Limit Shutdown Voltage

8

V

Current Share Accuracy (2 units paralleled)

+10

%

% of rated output current

Back-Drive Current Limit while Disabled

10

mA

Negative current drawn from output

Maximum Output Capacitance

3,000

µF

12Vout at 20A Resistive Load

DYNAMIC CHARACTERISTICS

Output Voltage during Load Current Transient

For a Step Change in Output Current (0.1A/µs)

200

mV

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

Settling Time

100

µs

To within 1% Vout nom

Turn-On Transient

Turn-On Time

500

µs

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

Start-Up Inhibit Time

2

ms

-40°C to +125°C; Figure E

Output Voltage Overshoot

5

%

5,000 µF load capacitance, Iout = 0A

EFFICIENCY

100% Load

96.5

%

Figure 1

50% Load

96.3

%

Figure 1

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

2000

V

Isolation Resistance

30

M

Ω

470

pF

BQ50120QTA20 ELECTRICAL CHARACTERISTICS

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

Note 1: UL's product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account while

designing input traces. User should ensure that Input trace is capable of withstanding fault currents until fuse blows.

Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)

Note 3: For modules with isolation voltage rating of 2250V, order the Feature Set option C. See last page for ordering details.

Note 4: Higher values of isolation capacitance can be added external to the module.