RD2 Просмотр технического описания (PDF) - Power Integrations, Inc
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RD2
Power Integrations, Inc
RD2 Datasheet PDF : 12 Pages
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RD2
General Circuit Description (cont.)
Line Regulation (Figure 7) - The amount of change in the DC
output voltage for a given change in the AC input voltage is
called line regulation. The maximum change in output voltage
is less than ±0.7%.
Efficiency (Line Dependent) - Efficiency is the ratio of the
output power to the input power. The curves in Figures 8 and 9
show how the efficiency changes with input voltage. Curves
are also given to show the difference in efficiency when C1 and
C9 are changed from 10 µF to 22 µF.
Efficiency (Load Dependent) - The curves in Figures 10 and 11
show how the efficiency changes with output power at 115 and
230 VAC inputs. The curves also show the increase in efficiency
when C1 and C9 are changed from 10 µF to 22 µF.
Power Supply Turn On Sequence - The internal switched, high-
voltage current source provides the initial bias current for
TOPSwitch when power is first applied. The waveforms shown
in Figure 12 illustrate the relationship between the high-voltage
DC bus and 12 V output voltage. Capacitors C1 and C9 charge
to the peak of the AC input voltage before TOPSwitch turns on.
The delay of 150 ms (typical) is caused by the time required to
charge the auto-restart capacitor C5 to 5.7 V. At this point the
power supply turns on as shown.
Figure 13 shows the output voltage turn on transient.
Line frequency ripple voltage is shown in Figure 14 for
115 VAC input and 8W output. Switching frequency ripple
voltage is shown in Figure 15 for the same test condition.
The power supply transient response to a step load change from
0.5 A to 0.67 A (75% to 100%) is shown in Figure 16. Note that
the response is quick and well damped.
The RD2 is designed to meet worldwide safety and EMI
(VDE B) specifications. Measured conducted emissions are
shown in Figure 17 for 115 VAC and Figure 18 for 230 VAC.
105
VIN = 115 VAC
100
95
0
100 200 300 400 500 600 700
Load Current (mA)
105
VIN = 230 VAC
100
95
0 100 200 300 400 500 600 700
Load Current (mA)
Figure 6. Load Regulation
4B
5/96
101
100.5
100
99.5
99
IOUT = 0.67 A
IOUT = 0.17 A
90 100 110 120 130
Input Voltage (VAC)
101
100.5
100
99.5
IOUT = 0.67 A
IOUT = 0.17 A
99
180 200 220 240 260
Input Voltage (VAC)
Figure 7. Line Regulation
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