參數(shù)資料
型號(hào)： HV-2405E
廠商： Intersil Corporation
英文描述： World-WideSingle Chip Power Supply
中文描述： 世界WideSingle電源芯片
文件頁(yè)數(shù)： 8/16頁(yè)
文件大?。?/td> 699K
代理商： HV-2405E
4-
8
Source resistor R1 equals 150
(limits the maximum input
current) and (3) Inhibit Capacitor C3 equals 150pF (turns off
the
HV-2405E
during
large
voltage
transients).
For applications where EMI (conductive interference) is a
design requirement, the circuit shown in Figure 8 is the rec-
ommended application circuit. This circuit delivers an output
voltage of 5V to 24V with an output current from 0 to 30mA
and passes VDE 0871 class “B” test requirements for con-
ductive interference with a resistive load.
FIGURE 8. IMBEDDED SUPPLY WITH EMI FILTER (I
OUT
≤
30mA)
Basic Operation
When power is initially applied the filter network reduces the
magnitude of any transient noise spikes that might result in
operation outside the SOA of the HV-2405E (see Start-up in
section titled “How the HV-2405E Works” for and explana-
tion of the SOA). When the voltage on pin 8 goes positive an
internal switch connects pin 8 to pin 2 and C2 starts to
charge through R1 and R2. When the voltage on pin 2
reaches a predetermined voltage the switch opens and the
charging of C2 stops. R1 limits the input current and along
with C1 provides a snubber for the internal switch. R2 also
has the effect of limiting the input current by increasing the
voltage on pin 2 sooner in the cycle. A linear regulator takes
current from C2 and provides a DC voltage at pin 6. The volt-
age at pin 6 is equal to V
z1
+ 5V. The inhibit capacitor (C3)
provides protection from large input voltage transients by
turning off the HV-2405E and the output capacitor C4 pro-
vides stabilization of the output stage.
Operation
The operation of the imbedded supply is illustrated in Figure 9
and Figure 10. Figure 9 shows operation with a 30mA load
and Figure 10 with the output short circuited. Notice that In
both cases, the inhibit function of the HV-2405E prevents the
circuit from turning on when the input voltage was applied
near the peak line voltage. Also notice the initial current pulse
(Figure 9) is approximately 1.6A and decreased to 1A within
40ms. This decrease in the input current results when the
charging current required to maintain the voltage on C2
decreased. The effect of the series resistor (R2) is illustrated
by the small voltage spike on the Vpin 2 trace. This voltage
spike increases the voltage on pin 2 to the 10V trip point
sooner in the cycle, thereby limiting the input current.
FIGURE 9. START UP OPERATION
FIGURE 10. SHORT CIRCUIT OPERATION
Setting The Output Voltage
The circuits shown in Figure 7 and Figure 8 provide a regu-
lated 5V to 24V
DC
output voltage that is set by adjusting the
value of Z1. The output voltage of the HV-2405E (pin 6) is
set by feedback to the sense pin (pin 5). The output will rise
to the voltage necessary to keep the sense pin at 5V. The
output voltage is equal to the Zener voltage (V
Z1
) plus the
5V on the sense pin. For a 5V output, pin 5 and pin 6 would
be shorted together. The output voltage has the accuracy
1
2
3
4
8
7
6
5
HV-2405E
N
C2
330
μ
F
C3
150pF
C4
10
μ
F
C0
0.33
μ
F
V
OUT
+
-
R2
2.7
COMPONENT LIST
FUSE = 1/ 4A
R1 = 150
, 3W
R2 = 2.7
, 1/4W
C1 = 0.1
μ
F, AC RATED
C2 = 330
μ
F, 15V + V
OUT
,
ELECTROLYTIC
C3 = 150pF, CERAMIC
C4 = 10
μ
F, V
OUT
+ 10V,
ELECTROLYTIC
Z1 = V
OUT
-5V, 1/4W
L1 = 2.2mh,
μ
= 2000
C0 = 0.33
μ
F, AC RATED
R1
150
C1
0.1
μ
F
L1
2.2mh
FUSE
AC RETURN
Z1
AC HIGH
FILTER
NETWORK
V
IN
= 264Vrms
(500V/DIV) (PIN 8)
INPUT CURRENT
(1A/DIV)
I
P
= 1.6A
V
PIN 2
(10V/DIV)
V
OUT
(5V/DIV)
I
OUT
= 30mA, V
OUT
= 5V
TIME (20ms/DIV)
IMBEDDED SUPPLY
OUTPUT SHORT CIRCUITED
V
IN
= 264Vrms
(500V/DIV) (PIN 8)
INPUT CURRENT
(1A/DIV)
I
P
= 1.6A
V
PIN 2
(10V/DIV)
V
OUT
(5V/DIV)
TIME (20ms/DIV)
IMBEDDED SUPPLY
HV-2405E
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