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HV859 Datasheet(PDF) 4 Page - Supertex, Inc |
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HV859 Datasheet(HTML) 4 Page - Supertex, Inc |
4 / 8 page 4 Supertex inc. www.supertex.com Doc.# DSFP-HV859 C073013 HV859 Split Supply Configuration Fig. 2: Split Supply and Enable/Disable Configuration Regulated Voltage = V DD D + V IN - C IN R SW R EL C S L X EL Lamp Enable Signal ON = V DD OFF = 0V 1 2 3 4 8 7 6 5 HV859 VDD RSW-Osc REL-Osc GND VA VB CS LX The HV859 can also be used for handheld devices operating from a battery where a regulated voltage is available. This is shown in Fig. 2. The regulated voltage can be used to run the internal logic of the HV859. The amount of current necessary to run the internal logic is 150µA max at a V DD of 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. The HV859 can be easily enabled and disabled via a logic control signal on the R SW and REL resistors as shown in Fig. 2 below. The control signal can be from a microprocessor. R SW and R EL are typically very high values. Therefore, only 10’s of microamperes will be drawn from the logic signal when it is at a logic high (enable) state. When the microprocessor signal is high the device is enabled, and when the signal is low, it is disabled. Fig. 1: Typical Application/Test Circuit V DD V DD = VIN Enable Signal ON = V DD OFF = 0V 560k 2.0M 1.0F 220H* 2.0k Equivalent to 3.0in2 lamp 10nF BAS21** 3.3nF 200V * Murata Inductor - LQH32CN221K21 ** BAS21 - General Purpose HV diode 1 2 3 4 8 7 6 5 HV859 VDD RSW-Osc REL-Osc GND VA VB CS LX + - |
Similar Part No. - HV859_13 |
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Similar Description - HV859_13 |
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