Product # MQFL-28V-1R8S

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-005-0005186 Rev. 1 04/21/09

Page 4

Output:

Current:

1.8V

40A

MQFL-28V-1R8S

technical Specification

MQFL-28V-1R8S ELECTRICAL CHARACTERISTICS (Continued)

Parameter

Min. Typ. Max. Units Notes & Conditions

Group A

Vin=28V dc ±5%, Iout=40A, CL=0µF, free running (see Note 10)

boost-converter non-operational unless otherwise specified

Subgroup

ISOLATION CHARACTERISTICS

Isolation Voltage

Dielectric strength

Input RTN to Output RTN

500

V

1

Any Input Pin to Case

500

V

1

Any Output Pin to Case

500

V

1

Isolation Resistance (in rtn to out rtn)

100

MΩ

1

Isolation Resistance (any pin to case)

100

MΩ

1

Isolation Capacitance (in rtn to out rtn)

44

nF

1

FEATURE CHARACTERISTICS

Switching Frequency (free running)

500

550

600

kHz

1, 2, 3

Synchronization Input

Frequency Range

500

600

kHz

1, 2, 3

Logic Level High

2.0

10

V

1, 2, 3

Logic Level Low

-0.5

0.8

V

1, 2, 3

Duty Cycle

20

80

%

See Note 5

Synchronization Output

Pull Down Current

20

mA

VSYNC OUT = 0.8V

See Note 5

Duty Cycle

25

75

%

Output connected to SYNC IN of other MQFL unit

See Note 5

Enable Control (ENA1 and ENA2)

Off-State Voltage

0.8

V

1, 2, 3

Module Off Pulldown Current

80

µA

Current drain required to ensure module is off

See Note 5

On-State Voltage

2

V

1, 2, 3

Module On Pin Leakage Current

20

µA

Imax drawn from pin allowed, module on

See Note 5

Pull-Up Voltage

3.2

4.0

4.5

V

See Figure A

1, 2, 3

BOOST-CONVERTER OPERATION

Input Voltage Arming Value

17.5

18.0

18.8

V

1, 2, 3

Switching Frequency

600

670

740

kHz

1, 2, 3

Input Terminal Current Ripple (RMS)

1

A

Vin = 16V; Iout = 40A

Total Converter Efficiency

Iout = 15A (10Vin)

80

%

1, 2, 3

Iout = 15A (16Vin)

82

%

1, 2, 3

Iout = 30A (16Vin)

82

%

1, 2, 3

RELIABILITY CHARACTERISTICS

Calculated MTBF (MIL-STD-217F2)

GB @ Tcase = 70ºC

2200

103 Hrs.

AIF @ Tcase = 70ºC

390

103 Hrs.

Demonstrated MTBF

TBD

103 Hrs.

WEIGHT CHARACTERISTICS

Device Weight

79

g

Electrical Characteristics Notes

1. Converter will undergo input over-voltage shutdown.

2. Derate output power to 50% of rated power at Tcase = 135ºC (see Figure 5).

3. High or low state of input voltage must persist for about 200µs to be acted on by the lockout or shutdown circuitry.

4. Current limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value.

5. Parameter not tested but guaranteed to the limit specified.

6. Load current transition time ≥ 10µs.

7. Settling time measured from start of transient to the point where the output voltage has returned to ±50mV of its final value.

8. Line voltage transition time ≥ 100µs.

9. Input voltage rise time ≤ 250µs.

10. Operating the converter at a synchronization frequency above the free running frequency will cause the converter’s efficiency to be slightly reduced

and it may also cause a slight reduction in the maximum output current/power available. For more information consult the factory.

11. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share section of the Control Features description.

12. After a disable or fault event, module is inhibited from restarting for 300ms. See Shut Down section of the Control Features description.

13. Only the ES and HB grade products are tested at three temperatures. The C grade products are tested at one temperature. Please refer to the

Construction and Environmental Stress Screening Options table for details.

14. These derating curves apply for the ES- and HB- grade products. The C- grade product has a maximum case temperature of 100ºC and a maximum

junction temperature rise of 20ºC above Tcase.