Technical Reference Notes

ALQ40/50 Series

(Open Frame Single Output Quarter Brick)

MODEL: ALQ50 SERIES

SHEET 5 OF 16

APRIL 21, 2003 - REVISION A (PRELIMINARY)

Electrical Specifications (continued)

OUTPUT SPECIFICATIONS

Parameter

Device

Symbol

Min

Typ

Max

Unit

Over Voltage Protection Range

7

3V3 (F)

2V5 (G)

1V8 (Y)

1V2 (K)

3.9

3.0

2.0

1.4

4.1

3.2

2.4

1.6

4.9

3.9

2.9

2.1

V

Over Temperature Range

6

(AVG PCB TEMPERATURE)

All

110

-

120

°C

Efficiency

3V3 (F)

2V5 (G)

1V8 (Y)

1V2 (K)

η

η

η

η

89.5

89.0

88.0

85.5

90.5

90.0

89.0

86.5

-

-

-

-

%

%

%

%

Turn-On Response Time

All

-

-

-

15

ms

Switching Frequency

All

2V5

-

-

440

490

480

540

520

590

KHz

KHz

Dynamic Response:

∆I

1V2/1V8

2V5/3V3

All

1V2/1V8

2V5/3V3

All

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.1

100

125

250

100

115

250

-

140

165

500

140

150

500

A/

µs

mV

µs

mV

µs

Output Overshoot

at T-on / T-off

Passive Resistive Full Load

All

-

-

-

5

%Vo

Note:

3. Appropriate Thermal Derating applies. See Appendix B for the Thermal Derating Curves

4. See Figure 2 for Ripple and Noise test measurement setup.

5. In an event of an over current condition - the converter will be latched off. Restart is possible either by

cycling the input voltage or toggling the Enable signal for 100ms. Consult factory for Auto restart

option.

6. Output of the module will be terminated once the operating temp reaches the OTP range. Normal

operation resumes once the temperature falls below the OTP range.

7. The OVP mode is latching. The converter will be latched off once the sensed voltage across the output

pins exceeds the threshold limits. Restart is possible by either cycling the input voltage or toggling the

Enable signal for 100ms.