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11

AHF28XX Series

AHF2812D

Notes to Specifications

1. Parameter guaranteed by line load and cross regulation tests.

2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.

3. Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz.

4. Load current split equally between +V

5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.

6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.

A capacitive oad in excess of the maximum limit will not disturb loop stability but may interfere with the

operation of the load fault detection circuitry, appearing as a short circuit during turn-on.

7. Parameter shall be tested as part of design characterization and after design or process changes.

Thereafter, parameters shall be guaranteed to the limits specified in Table V.

8. An overload is that condition with a load in excess of the rated load but less than that necessary to

trigger the short circuit protection and is the condition of maximum power dissipation.

9. Load step transition time between 2 and 10 microseconds.

10. Recovery time is measured from the initiation of the transient to where V

percent of V

11. Input step transition time between 2 and 10 microseconds.

12. Turn-on delay time measurement is for either a step application of power at the input or the removal of

a ground signal from the inhibit pin (pin 1) while power is applied to the input.

Limits

Test

Symbol

Conditions

-55°C

≤ Tc ≤+125°C

Vin = 28 Vdc ±5%, C

unless otherwise specified

Group A

Subgroups

Device

Types

Min

Max

Unit

Overload, T

8

6

Power dissipa-

tion load fault

P

D

Short circuit, T

1,2,3

01

2

W

Switching

frequency

4

F

S

I

4,5,6

01

500

600

kHz

500 mA to/from 1000mA

4,5,6

-200

+200

Output response

to step transient

load changes

4,9

VO

TLOAD

0 mA to/from 500 mA

4,5,6

01

-800

+800

mV pk

500 mA to/from 1000mA

4,5,6

01

70

Recovery time

step transient load

changes

4,9,10

TT

LOAD

0 mA to/from 500 mA

4,5,6

1000

µs

Output response

transient step line

changes

4,7,11

VO

TLINE

Input step from/to 16 to

40 V dc, I

4,5,6

01

-750

+750

mV pk

Recovery time

transient step line

changes

4,7,10,11

TT

LINE

Input step from/to 16 to 40 V

dc, I

4,5,6

01

1200

µs

Turn on

overshoot

4

VTon

OS

I

4,5,6

01

600

mV pk

Turn on delay

4,12

Ton

D

I

4,5,6

01

25

ms

Load fault

recovery

7

Tr

LF

4,5,6

01

25

ms

Weight

38

grams