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HV857LK7-G Datasheet(PDF) 5 Page - Supertex, Inc |
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HV857LK7-G Datasheet(HTML) 5 Page - Supertex, Inc |
5 / 8 page 5 Supertex inc. www.supertex.com Doc.# DSFP-HV857L A062013 HV857L Fig. 2: Split Supply and Enable/Disable Configuration EL Lamp ON = VDD OFF = 0V Enable Signal L X C S Regulated Voltage = V DD C IN D R EL R SW C DD Battery Voltage = V IN 1 2 3 4 8 7 6 5 HV857L VDD RSW-Osc REL-Osc GND VA VB CS LX Split Supply Configuration The HV857L can also be used for handheld devices operat- ing 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 HV857L. The amount of cur- rent necessary to run the internal logic is 150µA maximum at a V DD of 5.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. Enable/Disable Configuration The HV857L 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, which can be from a micropro- cessor, has to track the V DD supply. RSW and REL are typi- cally 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. Audible Noise Reduction The EL lamp, when lit, emits an audible noise. This is due to EL lamp construction and it creates a major problem for ap- plications where the EL lamp can be close to the ear such as cellular phones. The HV857L employs a circuit designed to help minimize the EL lamp’s audible noise by slowing down the rise and fall times seen by the EL lamp. Typical Waveform on V A, VB and Differential Waveform VA - VB |
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Similar Description - HV857LK7-G |
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