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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
Scope
Load
V out
V return
Power Supply
AC Hot
AC Neutral
AC Ground
Scope Note:
Use Tektronix
†
TDS460 Oscilloscope or
equivalent and a P6046 probe or equivalent.
Filter Note:
0.1uf - Kemet, C1206C104K5RAC or equivalent
10uf - United Chemi-con, 293D106X0025D2T or
equivalent
General Notes:
1. Load the output with its minimum load
current.
2. Connect the probes as shown.
3. Repeat the measurement with maximum
load on the output.
Load must be
isolated from the
ground of the
power supply.
0.1uf
10uf
Figure 6. Differential Noise Test Setup
2.2.8 Output 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
Output
Maximum Step Size
(% of rated output amps)
Maximum Step Size
(amps)
+12 V1DC 40%
+12 V2DC 60%
+5 VDC 30%
+3.3 VDC 30%
-12 VDC 0.1 A
+5 VSB 0.5 A
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