AHF28XX Series
AHF2812S
Table II. Electrical Performance Characteristics - continued
Test
Symbol
VOTLOAD
TTLOAD
Conditions
-55°C Tc +125°C
Vin = 28 Vdc ±5%, CL = 0
Group A
Subgroups
Device
Types
Limits
Unit
≤
≤
Min
Max
unless otherwise specified
Output response
to step transient
load changes6
50 mA to/from 1000mA
0 mA to/from 500mA
4
5,6
4
01
01
-300
-450
-500
-750
+300
+450
+500
+750
mV pk
µs
5,6
Recovery time
step transient
load changes6,7
50 mA to/from 1000mA
0 mA to 500 mA
4,5,6
4,5,6
100
1500
500 mA to 0 mA
4,5,6
4,5,6
10
ms
Output response
to transient step
line changes
VOTLINE
Input step 16 V to/from
40 V dc, IOUT =1000mA 4, 8
01
01
1500
mV pk
Recovery time
transient step
line changes
TTLINE
Input step 16 V to/from 40Vdc
4,5,6
800
µs
I
OUT =1000mA 4, 7, 8
Turn on
overshoot
VTonOS
TonD
TrLF
IOUT = 0 and 1000mA
IOUT = 0 and 1000mA 9
4,5,6
4,5,6
4,5,6
01
01
01
600
20
mV pk
ms
Turn on delay
Load fault
recovery4,9
20
ms
Weight
35
grams
Notes to Specifications
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive 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.
4. 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 II.
5. 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.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1
percent of VOUT at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. 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 is unlimited.
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