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EL7641 Datasheet(PDF) 9 Page - Intersil Corporation |
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EL7641 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 19 page  9 FN7415.1 September 26, 2005 Applications Information The EL7640, EL7641, EL7642 provide a highly integrated multiple output power solution for TFT-LCD applications. The system consists of one high efficiency boost converter and two low cost linear-regulator controllers (VON and VOFF) with multiple protection functions. The block diagram of the whole part is shown in Figure 17. Table 1 lists the recommended components. The EL7640, EL7641, EL7642 integrate an N-channel MOSFET in boost converter to minimize the external component counts and cost. The VON, VOFF linear- regulators are independently regulated by using external resistors. To achieve higher voltage than VBOOST, one or multiple stage charge pumps may be used. FIGURE 13. START-UP SEQUENCE FIGURE 14. OP AMP RAIL-TO-RAIL INPUT/OUTPUT FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 16. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) INPUT VOLTAGE VBOOST VON VOFF CDEL=220nF TIME (20ms/DIV) INPUT OUTPUT TIME (50µs/DIV) JEDEC JESD51-3 AND SEMI G42-88 (SINGLE LAYER) TEST BOARD 0.8 0.7 0.5 0.3 0.2 0.1 0 0 255075 100 150 AMBIENT TEMPERATURE (°C) 125 85 0.6 0.4 θJA=125°C/W QFN32 758mW JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD - QFN EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5 3 2.5 2 1.5 1 0.5 0 0 255075 100 150 AMBIENT TEMPERATURE (°C) 2.857W θJA=35°C/W QFN32 125 85 TABLE 1. RECOMMENDED COMPONENTS DESIGNATION DESCRIPTION C1, C2, C3 10µF, 16V X5R ceramic capacitor (1210) TDK C3216X5R0J106K D1 1A 20V low leakage schottky rectifier (CASE 457-04) ON SEMI MBRM120ET3 D11, D12, D21 200mA 30V schottky barrier diode (SOT-23) Fairchild BAT54S L1 6.8µH 1.3A Inductor TDK SLF6025T-6R8M1R3-PF Q11 200mA 40V PNP amplifier (SOT-23) Fairchild MMBT3906 Q21 200mA 40V NPN amplifier (SOT-23) Fairchild MMBT3904 EL7640, EL7641, EL7642 |
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Similar Description - EL7641 |
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