Electronic Components Datasheet Search |
|
SP4423CX Datasheet(PDF) 3 Page - Sipex Corporation |
|
SP4423CX Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 13 page SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 3 THEORY OF OPERATION The SP4423 is made up of three basic circuit elements, an oscillator, coil, and switched H-bridge network. The oscillator provides the device with an on-chip clock source used to control the charge and discharge phases for the coil and lamp. An external capacitor connected between pins 7 and 8 allows the user to vary the oscillator frequency from 32kHz to 400kHz. The graphs on page 6 show the relationship between C OSC and lamp output voltage. In general, increasing the C OSC capacitor will increase the lamp output voltage and decrease the lamp frequency. The suggested oscillator frequency is 64kHz (C OSC=150pF). The oscillator output is internally divided to create two internal control signals, f COIL and fLAMP. The oscillator output is internally divided down by 8 flip flops; a 64kHz signal will be divided into 8 frequencies; 32, 16, 8, 4, 2, 1, 0.5, and 0.25 Hz. The 3rd flip flop output (8kHz) is used to drive the coil (see Figure 2 on page 9) and the 8th flip flop output (250Hz) is used to drive the lamp. Although the oscillator frequency can be varied to optimize the lamp output, the ratio of f COIL/fLAMP will always equal 32. PIN DESCRIPTION Pin 1 – HON- Enable for driver operation, high = active; low = inactive. Pin 2 – V SS- Power supply common, connect to ground. Pin 3 – Coil- Coil input, connect coil from V DD to pin 3. Pin 4 – Lamp- Lamp driver output2, connect to EL lamp. Pin 5 – Lamp- Lamp driver output1, connect to EL lamp. Pin 6 – V DD- Power supply for driver, connect to system V DD. Pin 7 – Cap1- Capacitor input 1, connect to C OSC. Pin 8 – Cap2- Capacitor input 2, connect to C OSC. Q Q HON SCR1 SCR2 OSC FF1 FF2 EL Lamp VDD Coil 4 5 EL2 EL1 7 8 Cap1 Cap2 2 V SS VBATTERY VDD 6 3 20mH/70 Ω 1 0.1 µF fCOIL fLAMP fLAMP SP4423 Schematic 1 2 3 4 8 7 6 5 |
Similar Part No. - SP4423CX |
|
Similar Description - SP4423CX |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |