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PDF HV2405E Data sheet ( Hoja de datos )
| Número de pieza | HV2405E | |
| Descripción | World-Wide Single Chip Power Supply | |
| Fabricantes | Harris Corporation | |
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SEMICONDUCTOR
HV-2405E
April 1994
World-Wide
Single Chip Power Supply
Features
Description
• Direct AC to DC Conversion
• Wide Input Voltage Range. . . . . . . . . .15Vrms-275Vrms
• Dual Output Voltages Available
• Output Current . . . . . . . . . . . . . . . . . . . . . . . up to 50mA
• Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 5V to 24V
• Line and Load Regulation . . . . . . . . . . . . . . . . . . . . <2%
• UL Recognition, File # E130808
Applications
• Power Supply for Non-Isolated Applications
• Power Supply for Relay Control
• Dual Output Supply for OFF-LINE Motor Controls
• Housekeeping Supply for Switch-Mode Power
Supplies
Ordering Information
PART NUMBER
HV3-2405E-5
HV3-2405E-9
TEMPERATURE
RANGE
0oC to +75oC
-40oC to +85oC
PACKAGE
8 Lead Plastic DIP
8 Lead Plastic DIP
The HV-2405E is a single chip off line power supply that con-
verts world wide AC line voltages to a regulated DC voltage.
The output voltage is adjustable from 5VDC to 24VDC with an
output current of up to 50mA. The HV-2405E can operate
from input voltages between 15Vrms and 275Vrms as well
as input frequencies between 47Hz to 200Hz (see Table 1 in
section titled “Minimum Input Voltage vs Output Current” for
details).
The wide input voltage range makes the HV-2405E an excel-
lent choice for use in equipment which is required to operate
from either 240V or 120V. Unlike competitive AC-DC conver-
tors, the HV-2405E can use the same external components
for operation from either voltage. This flexibility in input volt-
age, as well as frequency, enables a single design for a
world wide supply.
The HV-2405E has a safety feature that monitors the incom-
ing AC line for large dv/dt (i.e. random noise spikes on AC
line, initial power applied at or near peak line voltage). This
inhibit function protects the HV-2405E, and subsequent cir-
cuitry, by turning off the HV-2405E during large dv/dt tran-
sients.This feature is utilized to ensure operation within the
SOA (Safe Operating Area) of the HV-2405E.
The HV-2405E can be configured to work directly from an
electrical outlet (see Figure 1) or imbedded in a larger sys-
tem (see Figure 7). Both application circuits have compo-
nents that will vary based on input voltage, output current
and output voltage. It is important to understand these val-
ues prior to beginning your design.
CAUTION: This Product Does Not Provide Isolation From The AC line. See “General Precautions”. Failure to use a properly rated
fuse may cause R1 to reach dangerously High Temperature or Cause the HV-2405E to Crack or Explode.
Pinout
HV-2405E (PDIP)
TOP VIEW
AC RETURN 1
PRE-REG
CAP (C2)
2
GND 3
INHIBIT 4
8 AC HIGH
7 NC
6 VOUT
5 VSENSE
Functional Diagram
SWITCHING
PRE-REGULATOR
AC
HIGH
R1
FUSE
DA1
8
SA1 DA2
LINEAR
POST-REGULATOR
Q1
6
VOUT
C1
4
RA4
RA5
DA3
ZA1
AC
RETURN
VOUT
(1, 3)
HV-2405E
+-
5
SENSE
RB11
SA2
C2
RB10
BANDGAP
REFERENCE
2
(1, 3)
AC
RETURN
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright © Harris Corporation 1992
5-15
File Number 2487.5
1 page  
HV-2405E
Application Information (Continued)
Optimizing Design (World-Wide Supply)
Selecting the Storage Capacitor C2
For applications requiring less than 50mA or the full input
voltage range, the value of C2 can be reduced for a more
cost effective solution. The minimum C2 capacitor value is
determined by the intersection between the maximum input
voltage and the output current curve in Figure 4. (Note, for
50Hz operation see Figure 19 in section titled “Typical Per-
formance Curves”.) Advantages of making C2 as small as
possible are:
• Reduced total size and cost of the circuit.
• Reduced start up time.
Consideration should be given to the tolerance and tempera-
ture coefficient of the C2 value selected. (Note; momentary
peak output current demands should be considered in the
sizing of C2. Increasing the output capacitor C4 is another
way to supply momentary peak current demands.)
OFFLINE WORLD-WIDE SUPPLY
275
35mA
240
10mA
210
180 50mA
150 25mA
120
90
60
30
0
0 75 100
220 330
C2 (µF)
470
FIGURE 4. MINIMUM C2 VALUE vs INPUT VOLTAGE
The following example illustrates the method for determining
the minimum C2 value required:
EXAMPLE
Requirements: VOUT = 5V to 24V, IOUT = 35mA, VIN(max) =
120Vrms, 60Hz.
For the given conditions, the minimum C2 value (from Figure
4) is determined to be 220µF.
Determining the Power Dissipation in R1
Circuit efficiency is limited by the power dissipation in R1.
The power dissipation for 240Vrms and 120Vrms is shown in
Figure 5.
For input voltages other than 240Vrms or 120Vrms equation
10 can be used to determine the power dissipation in R1.
NOTE: Under short circuit conditions the PD in R1
decreases to 1.2W Due to fold back current limiting (IOUT =
20mA, Reference Figure 6).
OFFLINE WORLD-WIDE SUPPLY (R1 = 100Ω)
6
5
4 240Vrms
3
2 120Vrms
1
0
0 10 20 30 40 50
LOAD CURRENT (mA)
FIGURE 5. POWER DISSIPATION IN R1 vs LOAD CURRENT
Operation Information
Effects of Temperature on Output Current:
Figure 6 shows the effects of temperature on the output
current for the circuit shown in Figure 1. Figure 6 illustrates
operation with the output configured for 5V. Temperature
effects on the output current for VOUT = 24V operation is
similar. The foldback current limiting is the result of reduced
voltage on C2. The circuit delivers 50mA output current
across the specified temperature range of -40oC to +85oC
for all output voltages between 5V and 24V. The effect of
decreasing the value of C2 (470µF) reduces the maximum
output current (i.e. moves curve to the left). For all C2 values
selected from Figure 4 (assuming tolerance and temperature
coefficient are taken into account) the circuit meets the
expected output current across the above mentioned
temperature range.
OFFLINE WORLD-WIDE SUPPLY
5
+ 85oC
4
3 +25oC
2
- 40oC
1
Pd = 2.8 √ R1 Vrms (IOUT)3
(EQ. 10)
Example: R1 = 100Ω, Input Voltage = 240Vrms, IOUT =
50mA, PD = 4.8W
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
FIGURE 6. OUTPUT CURRENT vs TEMPERATURE
5-19
5 Page 
HV-2405E
Safe Operating Area
Ensure operation is within the SOA of the HV-2405E. Refer-
ence “Start-Up” in section titled “How the HV-2405E Works”.
How The HV-2405E Works
decreases for C2 voltages below 5V. To understand why the
voltage on C2 determines the maximum input current that the
HV-2405E can safely turn off, its important to understand the
electrical connection between SA1, SA2 and the storage
capacitor C2. Figure 17(A) is a schematic representation of
both SCRs and is presented to explain how SA2 turns off SA1.
Steady State Operation
The HV-2405E converts an AC voltage into a regulated DC
voltage. This is accomplished in two functional sections (1)
Switching Pre-Regulator and (2) Linear Voltage Regulator.
Refer to HV-2405E schematic Figure 16.
Top Trace: Input Voltage at Pin 8, AC High (200V/Div)
Bottom Trace: Current into Pin 8, (0.5A/Div)
The purpose of the Switching Pre-Regulator circuit is to cap-
ture energy from an incoming AC power line, 1/6 of every
positive half cycle and store this energy in an electrolytic
capacitor (C2). This energy is then transferred to the Linear
Voltage Regulator.The current path for charging C2 is
through DA1, SA1 and DA2. When the voltage level on C2
reaches approximately 6.8V above the output voltage, SA2
turns on turning off SA1 and the charging of C2 stops until
the next positive half cycle on AC high. SA2 is triggered on
when current flows out of SA2s anode gate and through the
Zener diode stack (ZA1, DA3, DA4, DA5). This results in a
feedback circuit that limits the peak voltage on pin 2.
The input voltage and current wave forms at pin 8 are illus-
trated in Photo 1. The operation of the HV-2405E is easily
confirmed by noticing the clamping of the input voltage dur-
ing the charging of C2. Photo 2 shows the voltage on C2
(bottom trace), along with the voltage on pin 8 as a refer-
ence. The test conditions for the wave forms are listed at the
end of this section.
PHOTO 1
Top Trace: Input Voltage at Pin 8, AC High (200V/Div)
Bottom Trace: Pre-Regulator Capacitor Voltage, C2
(5V/Div) at Approximately 10VDC
The Linear Voltage Regulator performs two functions. The
first is to provide a reference voltage at pin 5 that is tempera-
ture independent and the second is to provide an output volt-
age on pin 6 that is adjustable from 5V to 24V. The band-gap
(NB1, NB2, RB3 and RB4) provides a temperature indepen-
dent reference voltage on the base of NB5. This reference
voltage (1.21V) results in approximately 1mA through RB10
when the feedback loop from pin 6 is closed. The output volt-
age is adjusted by placing a Zener diode between pin 5 and
pin 6. The output voltage on pin 6 is adjusted above the 5V
reference on pin 5 by a value equal to the Zener voltage. The
maximum output voltage is limited to ≈ 34VDC by the internal
Zener diode ZB2. ZB2 protects the output by ensuring that an
overvoltage condition does not exist. The bottom trace of
Photo 3 shows the output voltage ripple (worst case condi-
tions), along with the voltage on pin 8 as a reference.
Test conditions for waveforms: TA = +25oC, VAC = 240Vrms,
f = 50Hz, R1 = 150Ω, C1= 0.1µF, C2 = 470µF, C3 = 150pF,
C4 = 1µF, VOUT = 5V at 50mA.
Start-up
PHOTO 2
Top Trace: Input Voltage at Pin 8, AC High (200V/Div)
Bottom Trace: Ripple or Switch Spike on Regulator 5VDC
Output (50mV/Div) This is Worst Case
Ripple (High Line Voltage, Maximum IOUT)
Start up operation is similar to that described above. Since
the storage capacitor connected to pin 2 is discharged, the
main SCR, SA1, has to pass more current than for steady
state.
The ability of the second SCR, SA2, to turn off SA1 is a function
of the voltage on C2. Due to the impedances of SA1 and SA2,
the maximum input current that can be safely turned off
PHOTO 3
5-25
11 Page | ||
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| PDF Descargar | [ Datasheet HV2405E.PDF ] | |
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