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參數(shù)資料
| 型號： | HV3-2405E-9 |
| 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)： | 10/14頁 |
| 文件大?。?/td> | 573K |
| 代理商： | HV3-2405E-9 |
5-24
HV-2405E
Dual Supply
(I
OUT
<50mA)
Dual output voltages are available by making use of the 5V
reference at pin 5. The sum of both supply currents must not
exceed maximum output current limit of 50mA. The output
current for the 5V supply is delivered from the output (pin 6)
through the Zener diode. The wattage calculation for the
Zener diode is given in Equation 11.
General Precautions
CAUTION: This product does not provide isolation from the
AC line. Failure to use a properly rated fuse may cause R1 to
reach dangerously high temperatures or cause the HV-
2405E to crack or explode.
Instrumentation Effects
Background:
Input to output parasitic exist in most test equipment power
supplies. The inter-winding capacitance of the transformer
may result in substantial current flow (mA) from the
equipment ground wire to the AC and DC ground of the HV-
2405E. This current can induce instability in the inhibit circuit
of the HV-2405E resulting in erratic operation.
Recommendations for evaluation of the HV-2405E in the lab:
a). The use of battery powered DVMs and scopes will
eliminate ground loops.
b). When connecting test equipment, locate grounds as
close to pin 1 as possible.
c). Current measurements on the AC side of the HV-2405E
(Pin 8, Pin 1 and Pin 2) should be made with a non-con-
tact current probe.
If AC powered test equipment is used, then the use of an
isolated plug is recommended. The isolated plug eliminates
any voltage difference between earth ground and AC
ground. However, even though the earth ground is
disconnected, ground loop currents can still flow through
Wattage = (V pin 6 - V pin 5) (I
OUT
pin 5)
(EQ. 11)
transformer of the test equipment. Ground loops can be
minimized by connecting the test equipment ground probe
as close to pin 1 as possible.
Caution: Dangerous voltages may appear on exposed metal
surfaces of AC powered test equipment.
AC Source Effects
Background:
Laboratory AC sources (such as VARIACs, step-up trans-
formers etc.) contain large inductances that can generate
damaging high voltage transients any time they are switched
on or off. Switch arcing can further aggravate the effects of
source inductance.
Recommendation:
Adequate protection means (such as MOV, avalanche diode,
surgector, etc.) may be needed to clamp transients to within
the
±
500V input limit of the HV-2405E.
Output Short Circuited
For output voltages greater than 5V the maximum voltage
rating from pin 2 to pin 6 (15V) could be exceeded. For a
24V output the voltage on pin 2 could be as high as 32V.
Under normal operating conditions the voltage differential
between pin 2 and pin 6 is maintained by DA3, DA4, DA5
and ZA1 (Figure 6) to about 6V. However, if the output (pin 6)
is shorted to ground the potential difference would equal the
voltage on C2 which would exceed the 15V max limit. (Note:
if the output is shorted prior to initial power up, the voltage on
C2 only reaches about 6.8V and therefore is not a problem.)
Recommendation:
If the possibility of the output being shorted to ground during
normal operation exist, a 10V zener diode (cathode pin 2,
anode pin 6) is recommended from pin 2 to pin 6.
Application Information
(Continued)
FIGURE 15. DUAL SUPPLY
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
5.1V
R4
5.6K
5.6K
R5
3.3K
R3
3.9K
C1
0.1
μ
F
R1
100
AC HIGH
AC RETURN
V
OUT
= 5V + V
Z1
COMPONENT LIST
FUSE = 1/ 2A
R1 = 100
, 5W
R2 = 220k
, 1W
R3 = 3.9k
, 1W
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
V
OUT
= 5V
AC RETURN
AC RETURN
Q1
FUSE
C5
0.047
μ
F
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