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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 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 699K |
| 代理商： | HV-2405E |
4-
4
Application Information
FIGURE 1. OFF LINE WORLD-WIDE SUPPLY (I
OUT
≥
50mA)
Off line World Wide Supply (I
OUT
≤
50mA)
Figure 1 shows the recommended application circuit for an
off line world wide supply. The circuit will deliver an output
voltage of 5V to 24V and an output current from 0 to 50mA.
The value of C2 can be reduced for applications requiring
less output current (see section titled “Optimizing Design” for
details). For a basic understanding of the internal operation
of the HV-2405E reference section titled “How the HV-2405E
Works”.
The following is a detailed explanation of this application cir-
cuit:
Basic Operation
When the input voltage goes positive an internal switch
connects pin 8 to pin 2 allowing current to flow through R1 to
charge up C2. When the voltage on C2 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. A linear regulator
takes current from C2 further regulating the voltage and
limiting the ripple at pin 6. The voltage at pin 6 is equal to
V
Z1
+5V. The linear regulator also provides output current
limiting. The capacitor C4 on pin 6 is required for stability of
the output.
Input Current Limiting Circuit
The external components in the shaded area of Figure 1 per-
form two functions. The first is to shut down the HV-2405E in
the presences of a large voltage transients and the second is
to provide input current limiting.
Resistors R2, R3 and capacitor C3 monitor the input voltage
and turn on Q1 which shuts down the HV-2405E when the
input voltage or the dv/dt is too large. This network antici-
pates the voltage applied to pin 8, since R1 and C1 add
several micro seconds delay, and turns off the HV-2405E
when a predetermined input voltage is exceeded. The differ-
ence between R3/C3 and R1/C1 time constants ensures that
the HV-2405E internal switch opens before the voltage, and
thereby the input current, is allowed to rise to a dangerous
level at pin 8.The input voltage at which the HV-2405E is
turned off, is dependent upon the voltage on C2. The higher
the voltage on C2 the larger the input current that the HV-
2405E can safely turn off. For a detailed explanation of why
the voltage on C2 determines the maximum input current
that the HV-2405E can safely turn off, reference “Start-up” in
section titled “How the HV-2405E Works”.
Input current limiting is provided when the voltage at the
base of Q1 forward biases the base to emitter junction, turn-
ing off the internal switch. The voltage required at the base
to turn on Q1 increases as the voltage on C2 increases the
emitter voltage. When the voltage on C2 is >10V, the emitter
voltage is held constant by Z2 and the maximum input cur-
rent is set by resistors R2, R3, R4 and R5 (see section titled
“Design Equations” for more details).
Operation
The circuit in Figure 1 ensures operation within the SOA of
the HV-2405E by limiting the input current to <500mA when
the voltage on C2 equals zero and <2A when the voltage on
C2 is greater than 10V. The circuits operation is illustrated in
Figure 2 and Figure 3. In Figure 2 the initial current pulse is
approximately 400mA when V
C2
= 0V and gradually
increases to approximately 1.8A when C2 = 10V. Also notice
1
2
3
4
8
7
6
5
HV-2405E
Z1
C4
10
μ
F
2N2222
C3
20pF
R2
220K
C2
470
μ
F
R6
Z2
1N5231A
R4
5.6K
5.6K
R5
3.3K
R3
3.9K
C1
0.1
μ
F
R1
100
AC HIGH
AC RETURN
V
OUT
OPERATING CONDITIONS
V
IN
= 50Vrms TO 275Vrms
FREQUENCY = 50Hz to 60Hz
I
OUT
= 0mA to 50mA
V
OUT
= 5V + V
ZI
COMPONENT LIST
FUSE = 1/ 4A
R1 = 100
, 5W
R2 = 220k
, 1W
R3 = 3.9k
, 1/4W
R4 = 5.6k
, 1/ 4W
R5 = 3.3
, 1/ 4W
R6 = 5.6k
, 1/4 W
C1 = 0.1
μ
F, AC RATED
C2 = 470
μ
F, 15V + V
OUT
, ELECTROLYTIC
C3 = 20pF, CERAMIC
C4 = 10
μ
F, V
OUT
+ 10V, ELECTROLYTIC
C5 = 0.047
μ
F, 10V
Z1 = V
OUT
- 5V, 1/4W
Z2 = 5.1V, 1N5231/A OR EQUIVALENT
Q1 = 2N2222 OR EQUIVALENT
FUSE
0.047
C5
μ
F
HV-2405E
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