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HV3-2405E-9 Datasheet(PDF) 9 Page - Intersil Corporation |
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HV3-2405E-9 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 16 page  4-9 and tolerance of both the Zener diode and the band-gap of the HV-2405E (see Figure 16). The maximum output voltage is limited by ZB2 to ≈ 34VDC. ZB2 protects the output by ensuring that an overvoltage condition does not exist. Note: the output voltage can also be set by placing a resistor (1/4W) between pin 5 and pin 6. If a resistor is placed between pin 5 and pin 6 an additional 1V per kΩ (±10%) is added to the 5V output. Optimizing Design (Imbedded Supply) Selecting the storage capacitor C2 For applications requiring less than 30mA, the value of C2 can be reduced for a more cost effective solution. The mini- mum C2 capacitor value vs. output current is presented in Table 2. 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.) 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 11. For input voltages other than 240Vrms or 120Vrms Equation 10 can be used to determine the power dissipation in R1. FIGURE 11. POWER DISSIPATION IN R1 vs LOAD CURRENT Operation information Effects of Temperature on Output Current Figure 12 and Figure 13 show the effects of temperature on the output current for the imbedded supply (R2 = 2.7Ω). Fig- ure 12 illustrates VOUT = 5V operation and Figure 13 illus- trates VOUT = 24V operation. The imbedded supply (R2 = 2.7Ω) delivers 30mA output current across the specified tem- perature range of -40oC to +85oC for all output voltages between 5V and 24V. The effect of decreasing the value of C2 (330 µF) reduces the maximum output current (i.e. moves curve to the left). For all C2 values selected from Table 2 (assuming tolerance and temperature coefficient are taken into account) the circuit meets the expected output current across the above mentioned temperature range. FIGURE 12. OUTPUT CURRENT vs TEMPERATURE (R1 = 150 Ω, R2 = 2.7 Ω, C2 = 330µF) TABLE 2. IMBEDDED SUPPLY R1 - 150 Ω R2 = 2.7 Ω VIN FREQ. C2 IOUT 264Vrms 50Hz 330 µF 30mA 220 µF 24mA 100 µF 14mA 50 µF8mA 264Vrms 60Hz 330 µF 30mA 220 µF 27mA 100 µF 16mA 50 µF9mA 132Vrms 50Hz 330 µF 30mA 220 µF 30mA 100 µF 16mA 50 µF8mA 132Vrms 60Hz 330 µF 30mA 220 µF 30mA 100 µF 16mA 50 µF9mA Pd = 2.8 (EQ. 10) √ R1 Vrms (IOUT)3 LOAD CURRENT (mA) 0 1 2 3 4 0 102030 120Vrms 240Vrms IMBEDDED SUPPLY (R1 = 150 Ω) 5 4 3 2 1 0 0 1020304050607080 6 OUTPUT CURRENT (mA) +85oC -40oC +25oC IMBEDDED SUPPLY HV-2405E |
Similar Part No. - HV3-2405E-9 |
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Similar Description - HV3-2405E-9 |
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