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參數(shù)資料
| 型號： | HV2405E |
| 廠商： | Harris Corporation |
| 英文描述： | World-Wide Single Chip Power Supply |
| 中文描述： | 環(huán)球單片電源 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 573K |
| 代理商： | HV2405E |
5-21
HV-2405E
For applications requiring 30mA or less and not directly off
line (i.e. filter network preceding supply), the external tran-
sistor and associated resistors in Figure 1 can be replaced
with a single 1/4W resistor R2 and capacitor C3 (Figure 7) if:
(1) The filter network reduces the input dv/dt to less than
10V/
μ
s (ensures sufficient pin 2 voltage at turn off), (2)
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 explanation
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.
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
+ 10V,
ELECTROLYTIC
Z1 = V
-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
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
V
= 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
(10V/DIV)
V
OUT
(5V/DIV)
TIME (20ms/DIV)
IMBEDDED SUPPLY
Application Information
(Continued)
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