Product # BQ55090QTA27

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ559J Rev. C

04/02/09

Page 4

Input:

Output:

Current:

Package:

36-55 V

9.6 V

27A

Quarter-brick

Technical Specification

BQ55 FAMILY ELECTRICAL CHARACTERISTICS

Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature

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

Parameter

Min.

Typ.

Max.

Units Notes & Conditions

ISOLATION CHARACTERISTICS

Isolation Voltage (dielectric strength)

2000

V

See Absolute Maximum Ratings

Isolation Resistance

30

MΩ

Isolation Capacitance (input to output)

470

pF

See Note 3

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

Maximum Baseplate Temperature, Tb

N/A

°C

EFFICIENCY

100% Load

96

%

50% Load

96

%

FEATURE CHARACTERISTICS

Switching Frequency

131

155

178

kHz

ON/OFF Control (Option P)

Off-State Voltage

-1

0.8

V

On-State Voltage

2.4

18

V

ON/OFF Controll (Option N)

Application notes Figures A & B

Pull-Up Voltage

2.4

18

V

Pull-Up Resistance

-1

0.8

V

Output Over-Voltage Protection

7.5

V

Over full temp range; no load

Over-Temperature Shutdown OTP Trip Point

140

150

°C

Average PCB Temperature

Over-Temperature Shutdown Restart Hysteresis

10

°C

RELIABILITY CHARACTERISTICS

Calculated MTBF (Telcordia) TR-NWT-000332

1

106 Hrs. 80% load, 200LFM, 40 °C Ta

Calculated MTBF (MIL-217) MIL-HDBK-217F

TBD

106 Hrs. 80% load, 200LFM, 40 °C Ta

Field Demonstrated MTBF

106 Hrs. See our website for details

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

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

Note 3: Isolation capacitance can be added external to the module.