Product # BQ55090QPA40

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ559K Rev. A

3/6/07

Page 3

Input:

Input:

Output:

Output:

Current:

Current:

ackage:

35-55 V

35-55 V

9.6 V

9.6 V

43 A

43 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

55

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

18

V

INPUT CHARACTERISTICS

Operating Input Voltage Range

35

48

55

V

Input Under-Voltage Lockout

Turn-On Voltage Threshold

30

34

V

Turn-Off Voltage Threshold

29

31

V

Lockout Voltage Hysteresis

2

4

V

Input Over-Voltage Shutdown

Turn-Off Voltage Threshold

58.5

59.5

V

Turn-On Voltage Threshold

57

58

V

Maximum Input Current

9.5

A

100% Load, 35 Vin

No-Load Input Current

0.13

A

Disabled Input Current

7.0

15

mA

Inrush Current Transient Rating

0.01

Input Reflected Ripple Current

7

10

mA

RMS through 10µH inductor; Figure 14

Input Terminal Ripple Current

140

mA

RMS; Figure 13

Recommended Input Fuse

20

A

Fast blow external fuse recommended

Input Filter Component Values (L\C)

0.22\11

µH\µF

Internal values

Recommended External Input Capacitance

47

µF

OUTPUT CHARACTERISTICS

Output Voltage Set Point

9.6

V

48Vin, no load

Output Voltage Regulation

Over Line

42\4.0

%\V

Over Load

5.2\500

%\mV

Over Temperature

2\200

%\mV

Total Output Voltage Range

6.5

11.0

V

Over sample, line, load, temperature & life

Output Voltage Ripple and Noise

20MHz bandwidth

Peak-to-Peak

50

100

mV

Full Load; see Figure 15

RMS

12

mV

Full Load

Operating Output Current Range

0

43

A

Subject to derating

Output DC Current-Limit Inception

50

A

Output DC Current-Limit Shutdown Voltage

5

V

Current Share Accuracy (3 units paralleled)

+10

%

Above 50% of rated output current

Back-Drive Current Limit while Disabled

10

mA

Negative current drawn from output

Maximum Output Capacitance

4,000

µF

9.6Vout at 40A Resistive Load

DYNAMIC CHARACTERISTICS

Input Voltage Ripple Rejection

14

dB

Figure 19

Output Voltage during Load Current Transient

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

200

mV

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

Settling Time

100

µs

To within 1% Vout nom

Turn-On Transient

Turn-On Time (without output capacitance)

250

µs

Full load, Vout=90% nom., 0 output cap.

Turn-On Time (with output capacitance)

3

5

ms

Full load, Vout=90% nom., 3,000 µF cap.

Output Voltage Overshoot

0

%

3,000 µF load cap., Iout = 0A, Vin nom.

EFFICIENCY

93% Load

96.5

%

Figure 1; 48Vin, 40A

50% Load

97.0

%

Figure 1

TEMPERATURE LIMITS FOR POWER DERATING CURVES

Semiconductor Junction Temperature (see Note 1)

125

°C

Package rated to 175°C

Board Temperature

125

°C

Board rated to 165°C

Transformer Temperature

125

°C

ISOLATION CHARACTERISTICS

Isolation Voltage (dielectric strength)

2000

V

Isolation Resistance

30

1. For normal operating conditions of 55°C ambient temperature and 200 LFM airflow. Device is designed to operate for a minimum of 72 hours, once per

year under the following conditions: 70°C, 200 LFM airflow, 38Vin, 300W output power. Junction temperature during those conditions will exceed the listed

specification.

BQ55090QPA40 ELECTRICAL CHARACTERISTICS

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