4 www.irf.com
AMA28XXD Series
Dynamic Characteristics -55°C ≤ T
CASE
≤ +125°C, V
IN
= 28V
DC
±5%, C
L
= 0, unless otherwise specified.
Notes to Specifications
1. Applicable to positive and negative outputs.
2. Maximum combined output is 5.0 watts. 4.0 watts (max.) is available from either output (80%).
3. Load current split equally between +VOUT and –VOUT.
4. 1.0 watt load on output under test, 1.0 watt to 4.0 watt load change on other output.
5. Capacitive value may be any value from 0 to the maximum limit without compromising DC performance. A
capacitive load 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.
6. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limit specified.
7. Load step transition time between 2 and 10 microseconds.
8. Recovery time is measured from initiation of the transient to where VOUT has returned to within ±1% of
VOUT at 50% load.
9. Input step transient time between 1 and 10 microseconds.
10. 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 while power is applied to the input.
Parameter
Group A
Subgroups
Test Conditions
Min
Nom
Max
Unit
Short Circuit Recovery
6
4, 5, 6 0% load to 100% load
25 ms
Switching Frequency
3
4, 5, 6 100% load 500 550 600 KHz
Output Response To Step
Transient Load Changes
3, 7
4, 5, 6
4, 5, 6
Load step 50% 100%
Load step 0% 50%
-400
-800
+400
+800
mV pk
Recovery Time, Step Transient
Load Changes
3, 7, 8
4, 5, 6
4, 5, 6
Load step 50% 100%
Load step 0% 50%
100
2000
µs
Output Response Transient Step
Line Changes
3, 6, 9
AMA2805D
AMA2812D
AMA2815D
4, 5, 6
4, 5, 6
4, 5, 6
Input step 16 40Vdc,
100% load
-550
-750
-750
+550
+750
+750
mV pk
Recovery Time Transient Step Line
Changes
3, 6, 9
4, 5, 6
Input step 16 ⇔ 40Vdc,
100% load
1200
µs
Turn On Overshoot
3, 10
4, 5, 6
4, 5, 6
0% load
100% load
600
400
mV pk
Turn On Delay
3, 10
4, 5, 6 0% load to 100% load
25 ms