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TK65912M Datasheet(PDF) 10 Page - TOKO, Inc |
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TK65912M Datasheet(HTML) 10 Page - TOKO, Inc |
10 / 20 page Page 10 May 2000 TOKO, Inc. TK6591x With properly selected components, the TK6591x will nominally support peak output voltages to 90 V (180 V PK-PK). Should the EL Panel become disconnected from the driver outputs, the removal of the load can cause the output voltage to increase beyond 90 V. To protect against this fault condition, a clamp circuit exists on the high voltage output which nominally limits the output voltage to a typical value of 105 V (210 V PK-PK). THEORY OF OPERATION (CONT.) DETAILS CONCERNING THE H-BRIDGE SECTION OPERATION In an effort to extend EL lamp life, reduce EMI emissions, and reduce the power draw of the IC, current sources to control the charging and discharging of the EL lamp panel and special sequencing control of the H-bridge FETs were added to the H-bridge of TK659xx. Current sources were added between ground and the sources of the low-side N-channel FETs (Figure 2). Therefore, the current into and out of the EL panel is controlled and limited. The FETs are turned off and on in the sequence shown in Figure 3. As is noted in Figure 3, there is a period of time when both of lower N-channel FETs are turned on and both of upper P-channel FETs are turned off. This provides a period of time to discharge the EL panel capacitance completely; before starting to recharge it again with current from HV voltage rail. Therefore, this special sequencing method prevents taking current off the HV voltage rail during the discharge of EL panel capacitance and operates more efficiently. HV HVP HVP UL UR EL Panel LL LR Current Source 1 Current Source 2 EL- EL+ FIGURE 2: H-BRIDGE SCHEMATIC ON ON ON ON ON UL UR LL LR VEL+ VEL = VEL- OFF OFF OFF OFF BOTH OFF OFF ON OFF ON ON BOTH ON Discharging EL Panel Capacitance VEL+ VEL- - OFF OFF FIGURE 3: H-BRIDGE SEQUENCING WAVEFORMS |
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