Intel TFX12V manual Output Transient Response, Differential Noise Test Setup, Maximum Step Size

TFX12V Power Supply Design Guide Thin Form Factor with 12-V Connector Version 2.0

Pow er Supply	V out
AC Hot
AC Neutral	V return	10uf	0 .1uf

AC G round

G eneral Notes:

1. Load the output with its m inim um load current.

2. Connect the probes as shown.

3. Repeat the m easurem ent with m axim um load on the output.

Load

Load m ust be isolated from the ground of the power supply.

Filter Note:

0.1uf - Kem et, C 1206C 104K5R AC or equivalent 10uf - United Chem i-con, 293D106X0025D 2T or

equivalent

Scope

Scope Note:

Use Tektronix† TDS460 O scilloscope or equivalent and a P6046 probe or equivalent.

Figure 6. Differential Noise Test Setup

2.2.8Output Transient Response

Table 11 summarizes the expected output transient step sizes for each output. The transient load slew rate is = 1.0 A/µs.

Table 11. DC Output Transient Step Sizes

	Maximum Step Size
Output	(% of rated output amps)
+12 V1DC	40%
+12 V2DC	60%
+5 VDC	30%
+3.3 VDC	30%
-12 VDC
+5 VSB

Maximum Step Size

(amps)

0.1A

0.5A

Note: For example, for a rated +5 VDC output of 14 A, the transient step would be 30% × 14 A = 4.2 A

Output voltages should remain within the regulation limits of Table 2, Section 2.2.1, for instantaneous changes in load as specified in Table 11 and for the following conditions:

•Simultaneous load steps on the +12 VDC, +5 VDC, and +3.3 VDC outputs (all steps occurring in the same direction)

•Load-changing repetition rate of 50 Hz to 10 kHz

•AC input range per Section 3.1 and Capacitive loading per Table 12