HV-2405E HARRIS | Alldatasheet
Document overview
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- PDF pages: 14
Technical content
Features
- Direct AC to DC Conversion
- Dual Output Voltages Available
- 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
HV3-2405E-5 0 oC to +75oC 8 Lead Plastic DIP HV3-2405E-9 -40 oC to +85oC 8 Lead Plastic DIP File Number 2487.5 April 1994 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 HIGH NC GND AC RETURN INHIBIT VOUT VSENSE PRE-REG CAP (C2) Functional Diagram RA4 RA5 DA3 ZA1 VOUT FUSE +- RB11 RB10 DA1 SA1 DA2 Q1 (1, 3) BANDGAP REFERENCE SA2 AC RETURN AC HIGH R1 SWITCHING PRE-REGULATOR LINEAR POST-REGULATOR VOUT SENSE AC RETURN (1, 3) HV-2405E
Specifications HV-2405E Test Circuit Absolute Maximum Ratings Thermal Information Thermal Resistance θJA CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Electrical SpecificationsUnless Otherwise Specified: VIN = 264Vms at 50Hz, C1 = 0.05µF, C2 = 470µF, C4 = 1µF, VOUT = 5V, IOUT = 50mA, Source Impedance R1 = 150Ω . Parameters are Guaranteed at the Specific VIN and Frequency Conditions, Unless Otherwise Specified. See test circuit for Component Location. PARAMETER CONDITIONS TEMP HV-2405E-5/-9 UNITSMIN TYP MAX Output Voltage (At Preset 5V) VREF = 0VDC +25oC 4.75 5.0 5.25 V Full 4.65 5.0 5.35 V Output Voltage (At Preset 24V) VREF = 19VDC +25oC 22.8 24.0 25.2 V Full 22.32 24.0 25.68 V Line Regulation 80Vrms to 264Vrms +25 oC - 10 20 mV Full - 15 40 mV Load Regulation (I OUT = 5mA to 50mA) +25 oC- -2 0 m V Full - - 40 mV Output Current Full 50 - - mA Output Ripple (Vp-p) Full - 24 - mV Short Circuit Current Limit Full - 70 - mA Output Voltage TC Full - 0.02 - %/ oC Quiescent Current Post Regulator 11VDC to 30VDC on Pin 2 +25 oC- 2 -m A DUT VREF NC 470µF 150pF 1µF 0.05µF FILTER NETWORK AUTOMATIC TEST EQUIPMENT V OUT 150Ω TEST SIGNALS SHOULD BE FILTERED TO PRECLUDE TRANSIENTS TO LESS THAN 10V/µs
Zener diode is given in Equation 11. of the HV-2405E resulting in erratic operation. as close to pin 1 as possible. surfaces of AC powered test equipment. ±500V input limit of the HV-2405E. 24V output the voltage on pin 2 could be as high as 32V. anode pin 6) is recommended from pin 2 to pin 6. FIGURE 15. DUAL SUPPLY
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 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. 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. 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: T A = +25oC, VAC = 240Vrms, f = 50Hz, R1 = 150Ω , C1= 0.1µF, C2 = 470µF, C3 = 150pF, C4 = 1µF, VOUT = 5V at 50mA. Start-up 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 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. Top Trace: Input Voltage at Pin 8, AC High (200V/Div) Bottom Trace: Current into Pin 8, (0.5A/Div) 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 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 I OUT ) PHOTO 3
FIGURE 16. HV-2405E SCHEMATIC DIAGRAM