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LS7636 데이터시트(PDF) 1 Page - LSI Computer Systems |
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LS7636 데이터시트(HTML) 1 Page - LSI Computer Systems |
1 / 7 page REVERSE PHASE (TRAILING-EDGE) HALOGEN LAMP DIMMER FEATURES: • Pushbutton or touch control of high-voltage lamps and all electronic transformer-coupled low-voltage halogen lamps. • Controls Fluorescents and CFLs via dimming ballasts. • Reverse-phase technology eliminates RFI generation. • “ FO" versions power up Full On after application of AC. • Soft turn-on and soft turn-off • Three operating modes. • Inputs for direct or remote activation. • 50Hz/60Hz AC line frequency. • +12V Power Supply (VDD - VSS). • LS7636, LS7637 (DIP); LS7636-S, LS7637-S (SOIC); LS7636FO, LS7637FO (DIP); LS7636FO-S, LS7637FO-S (SOIC) - See Figure 1 - APPLICATIONS: Electronic dimmers for wall-switch control of ceiling mounted lighting, foot-switch control of large floor lamps and hand- switch control of table lamps. BACKGROUND AND GENERAL DESCRIPTION: Since the operating currents of some electronic transformers are below the holding current of most triacs, a typical triac- based (leading-edge) dimmer may not operate properly when driving an electronic transformer-coupled low-voltage halogen lamp. The filtering components in the electronic transformer which prevent its operating frequency from generating line in- terference can also inhibit triac triggering. The LS7636_LS7637 family of reverse-phase dimmer ICs drive FETs or IGBTs (see Figure 3 and Figure 4) and ‘slowly’ turns on current beginning at the AC input zero-crossing. This ‘slow’ current turn on is ideal for interfacing with the primary of any electronic transformer and also eliminates the RFI generation caused by the sudden turn on of current when using a triac- based dimmer. INPUT/OUTPUT DESCRIPTION: VDD (Pin 1) Supply voltage positive terminal. VSS (Pin 7) Supply voltage negative terminal. MODE (Pin 2) - See Table 1 All variations of LS7636 and LS7637 can operate in 3 different modes. The 3-state MODE input selects the operating modes: VSS = Mode 0; Float = Mode 1; VDD = Mode 2 SYNC (Pin 4) - See Figure 2 The AC line frequency is applied to this input. All internal timings are synchronized to the AC. SENS (Pin 5) - See Table 1 A Logic 0 applied to this input alters the Gate Drive output either by turning it on, turning it off or by changing its conduction angle. Specifically which action takes place is dependent on the type of activation of the SENS input, namely SHORT or LONG duration and the prior state of the Gate Drive output. OVC - Overcurrent Sense Input (Pin 6) The voltage at this input is sampled every half-cycle in a four-cycle period. If the voltage reaches the OVC threshold four times, then the Gate Output is turned Off shutting down the current through the load. Six cycles after shutdown occurs, the output is turned On to the previous conduction angle, the OVC counter is reset and a new four-cycle period begins. The OVC voltage may be generated with a fractional-Ohm resistor as shown in Figure 4 and Figure 5. When OVC is not being used, Pin 6 must be tied to Pin 7. Gate (Pin 8) The Gate Drive output is a positive-going pulse that initiates at every zero-crossing of the AC input. The width of the Gate Drive signal determines the conduction angle as shown in Figure 2. Test (Pin 3) For factory use only. June 2009 7636-061009-1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 UL ® A3800 LS7636 LS7637 LS7636FO LS7637FO The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. 1 2 3 4 8 7 6 5 VSS (-V ) OVC VDD (+V ) MODE SYNC FIGURE 1 GATE SENS PIN ASSIGNMENT - TOP VIEW TEST |
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