BOTTOM VIEW

(48.3)

1.90

2.28

(57.9)

1.14

(29.0)

1.20

(30.5)

1.40

2.00

1

0.60

(35.6)

(50.8)

(15.2)

3

2

4

Mounting hole diameter:

0.126 (3.2) clearance hole

0.18 min.

2.40

SIDE VIEW

(13.2)

0.52

9

6

7

8

5

(61.0)

(4.6)

ø 0.04

(1.02)

Pins 2,3,

6,7 & 8

ø 0.08

(2.03)

Pins 1,4,

5 & 9

PIN CONNECTIONS

Pin

Function

1

+Vin

2

Remote On/Off

3

Case

4

-Vin

5

-Vout

6

-Sense

7

Trim

8

+Sense

9

+Vout

1. All dimensions are in inches (mm)

2. Weight: 0.57 lbs (260 g) approx

3. Tolerances: X.XX = ±0.02 (X.X = ±0.5)

X.XXX = ±0.01 (X.XX = ±0.25)

Notes

1. Output Ripple and Noise measured with 10 µF tantalum and 1 µF ceramic

capacitor across output.

2. Add suffix ‘N’ to the model number to receive the unit with negative logic

Remote On/Off.

3. Minimum of 220 µF required on input.

4. Measured at nominal input voltage.

5. Peak Current is for max duration of 3s with 10% duty cycle. Average output

power not to exceed 300W.

6. 48 V output models require minimum 220 µF capacitor across output rails to

maintain regulation.

Models & Ratings

QSB300

Output Voltage Adjustment

Input Voltage

Output Voltage

Output Current

Input Current

Max. Capacitive

Load

Nom.

No Load

Full Load

9-36 V

5.0 V

60.0 A

70.00 A

200 mA

14.21 A

88.0%

10000 µF

QSB30024S05

12.0 V

25.0 A

29.16 A

200 mA

13.89 A

90.0%

10000 µF

QSB30024S12

24.0 V

12.5 A

14.58 A

100 mA

14.21 A

88.0%

4700 µF

QSB30024S24

28.0 V

10.7 A

12.50 A

100 mA

14.11 A

88.0%

4700 µF

QSB30024S28

48.0 V

6.25 A

7.29 A

100 mA

14.37 A

87.0%

2200 µF

18-75 V

5.0 V

60.0 A

70.00 A

100 mA

6.94 A

90.0%

10000 µF

QSB30048S05

12.0 V

25.0 A

29.16 A

100 mA

6.94 A

90.0%

10000 µF

QSB30048S12

24.0 V

12.5 A

14.58 A

80 mA

6.98 A

89.0%

4700 µF

QSB30048S24

28.0 V

10.7 A

12.50 A

80 mA

6.94 A

90.0%

4700 µF

QSB30048S28

48.0 V

6.25 A

7.29 A

80 mA

7.02 A

89.0%

2200 µF

Mechanical Details

Notes

The Trim input permits the user to adjust the output voltage up or

down according to the trim range specification (90% to 110% of

nominal output). This is accomplished by connecting an external

resistor between the +Vout and +Sense pin for trim up and between

the TRIM and -Sense pin for trim down, see figure:

Load

+Vin

+

-Vin

+S

+Vout

-Vout

-S

TRIM

C2

Rv

Rt

C1

+

Vin

+

-

The Trim pin should be left open if trimming is not being used. The

output voltage can be determined by the following equations:

Rt x 33

Rt + 33

1.24 x

Vf =

Rt x 33

Rt + 33

7.68 +

( Vnom + Rv ) x Vf

Vout =

Rv =

Vout

Vf

- Vnom

Recommended Value of Rt is 6.8k

Ω,thereforeVf=0.525

Examples:

1. To trim 12 V unit up by 10%

Rv =

13.2

0.525

2. To trim 24 V unit down by 10%

Rv =

19.2

0.525