LSI/CSI UL ® LS7636 LS7637 LS7636FO LS7637FO LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 REVERSE PHASE (TRAILING-EDGE) HALOGEN LAMP DIMMER PIN ASSIGNMENT - TOP VIEW V DD (+V ) 1 2 TEST 3 SYNC 4 LS7636 LS7637 MODE LSI 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 - June 2009 8 GATE 7 VSS (-V ) 6 OVC 5 SENS FIGURE 1 SENS (Pin 5) - See Table 1 A Logic 0 applied to this input alters the Gate Drive output APPLICATIONS: Electronic dimmers for wall-switch control of ceiling mounted either by turning it on, turning it off or by changing its lighting, foot-switch control of large floor lamps and hand- conduction angle. Specifically which action takes place is dependent on the type of activation of the SENS input, switch control of table lamps. namely SHORT or LONG duration and the prior state of the Gate Drive output. BACKGROUND AND GENERAL DESCRIPTION: Since the operating currents of some electronic transformers are below the holding current of most triacs, a typical triac- OVC - Overcurrent Sense Input (Pin 6) based (leading-edge) dimmer may not operate properly when The voltage at this input is sampled every half-cycle in a driving an electronic transformer-coupled low-voltage halogen four-cycle period. If the voltage reaches the OVC threshold lamp. The filtering components in the electronic transformer four times, then the Gate Output is turned Off shutting down which prevent its operating frequency from generating line in- the current through the load. Six cycles after shutdown terference can also inhibit triac triggering. The occurs, the output is turned On to the previous conduction LS7636_LS7637 family of reverse-phase dimmer ICs drive angle, the OVC counter is reset and a new four-cycle period FETs or IGBTs (see Figure 3 and Figure 4) and ‘slowly’ turns begins. The OVC voltage may be generated with a on current beginning at the AC input zero-crossing. This ‘slow’ fractional-Ohm resistor as shown in Figure 4 and Figure 5. current turn on is ideal for interfacing with the primary of any When OVC is not being used, Pin 6 must be tied to Pin 7. electronic transformer and also eliminates the RFI generation caused by the sudden turn on of current when using a triac- Gate (Pin 8) The Gate Drive output is a positive-going pulse that initiates based dimmer. at every zero-crossing of the AC input. The width of the Gate Drive signal determines the conduction angle as INPUT/OUTPUT DESCRIPTION: shown in Figure 2. VDD (Pin 1) Supply voltage positive terminal. Test (Pin 3) For factory use only. 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. 7636-061009-1 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. TIMING CHARACTERISTICS (See Figures 2, 3 and 4): PARAMETER SYMBOL MIN SYNC Frequency SHORT Activation LONG Activation GATE DRIVE pulse width (see Note 5) Conduction Angle Ø incremental steps (Note 1) Soft-on slew rate A0 to A1/A2 to A0 slew rate (Note 2) A1 to B1/B2 to A2 slew rate (Note 3) B1 to B2 delay (Note 4) Note 1: Note 2: Note 3: Note 4: Note 5: MAX UNIT CONDITION fS TS1 TS1 TS2 TS2 GDW GDW ø ∆ø 40 50 60 433 520 2.31 2.78 50 - 1.4 70 Hz 417 ms 500 ms Infinite ms Infinite ms 7.13 ms 8.56 ms 154 deg deg 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz - SS SS SAA SBA SBA SBA TBD TBD - 1.4 1.4 1.4 1.4 1.4 1.4 500 600 - 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz deg / 33.3ms deg / 40ms deg / 33.3ms deg / 40ms deg / 66.7ms deg / 80ms ms ms Total number of steps = 77. Number of steps from A0 to A1, or A2 to A0 = 55. Number of steps from A1 to B1 or B2 to A2 = 21. ø is at minimum between B1 and B2. TBD is applicable for LS7636 only. For LS7637 when minimum ø is reached, dimming direction reverses only if the LONG Activation is terminated and reapplied. The difference among all versions of LS7636 and LS7637 are: LS7636 (LS7636FO) Upon power-up, the Gate Drive output is Off. (Upon power-up, the Gate Drive output is On at maximum conduction angle.) When a LONG Activation is applied, the dimming direction automatically reverses whenever maximum or minimum conduction angles are reached. LS7637 (LS7637FO) Upon power-up, the Gate Drive is Off. (Upon power-up, the Gate Drive is On at maximum conduction angle.) When a LONG Activation is applied, the dimming stops whenever maximum or minimum conduction angles are reached. In order to change dimming levels from maximum or minimum, LONG Activation must be removed and reapplied. The purpose of this feature is to allow the user to positively locate maximum and minimum conduction angles. 7636-121906-2 TYP LS7637 NOTE: If the User applies a LONG Activation when the Gate Drive Conduction Angle is within a "few" degrees of Maximum or Minimum, the Gate Drive Conduction Angle can move to Maximum or Minimum and stop without the User being able to observe a change in brightness. Therefore, the User should be instructed that if no change in brightness is observed in response to a LONG Activation, the LONG Activation should be removed and reapplied in order to produce a change in brightness. TABLE 1 MODE SHORT-ACTIVATION PRE-ACTIVATION Ø LONG-ACTIVATION POST-ACTIVATION Ø PRE-ACTIVATION Ø DIMMING REVERSAL (Note 5) POST-ACTIVATION Ø 0 OFF ON MAX (Note 1) OFF (Note 4) OFF/MIN MAX INTERMEDIATE Varies up from MIN Varies down from MAX Varies from INTERMEDIATE N/A N/A NO 1 OFF ON MEMORY (Notes 2, 3) OFF (Note 4) OFF/MIN MAX INTERMEDIATE Varies up from MIN Varies down from MAX Varies from INTERMEDIATE N/A N/A YES 2 OFF ON MAX (Note 1) OFF (Note 4) OFF/MIN MAX INTERMEDIATE Varies up from MIN Varies down from MAX Varies from INTERMEDIATE N/A N/A YES Note 1: A soft turn-on is produced by slewing up the conduction angle, ø, from minimum at the rate of 1.4O / 33.3ms (60Hz). Note 2: A soft turn-on is produced by slewing up ø, from minimum to memory. Upon power-up the memory value is defaulted to maximum conduction angle. Note 3: “Memory” refers to the conduction angle, ø, which existed prior to the current off-state. Note 4: A soft turn-off is produced by slewing down ø from the existing conduction angle to off at the rate of 1.4O / 33.3ms (60Hz). Note 5: NO = Dimming direction does not reverse from prior dimming direction. YES = Dimming direction does reverse from prior dimming direction. N/A = Does not apply. ABSOLUTE MAXIMUM RATINGS: PARAMETER DC supply voltage Any input voltage Operating temperature Storage temperature SYMBOL VDD - VSS VIN TA TSTG VALUE +16 VSS - 0.3 to VDD + 0.3 0 to +90 -65 to +150 UNIT V V °C °C DC ELECTRICAL CHARACTERISTICS: (TA = +25°C, all voltages referenced to VSS. VDD = +12V unless otherwise noted.) PARAMETER SYMBOL MIN TYP MAX UNIT Supply voltage Supply current VDD IDD 10 - 12 0.8 15 1 V mA SYNC Lo VISL - - 5.7 V SYNC Hi VISH 6.4 - - V - SENS Lo VIEL - - 4.5 V - SENS Hi VIEH 7.7 - - V - GATE DRIVE Source Current Sink Current IGSR IGSN 4 4 - - mA mA VOH = 11.5V VOL = 0.5V -- 0.35 - V - OVC 7636-063008-3 CONDITION Output unloaded VDD = +12V - sync Φ Φ Gate FIGURE 2. Gate Conduction Angle, Φ ts1 ts2 short sens A0 short Φ 150 mode2 100 50 off A1 B1 B2 A2 reversal A1 B1 B2 A2 reversal memory short short long LS7636 no memory A0 Φ 150 mode2 100 50 off Φ 150 mode1 100 50 off no memory no reversal A1 B1 B2 A2 Φ 150 mode1 100 50 off Φ 150 mode0 100 50 off short long A0 Φ 150 mode0 100 50 off sens short long long long short long no memory no reversal reversal memory reversal FIGURE 3. Gate Conduction Angle, Φ vs Sens no memory LS7637 EXT SWITCH V DD R2 + C1 D1 R10 Q1 D2 1 D3 Q3 D4 R1 P 2 3 D5 R9 U3 1 2 R3 3 4 C2 V DD GATE MODE V SS TEST OVC SYNC SENS/ 8 7 R5 6 5 C4 LS7636 R4 3 2 R6 SENSE C3 SWITCH Q2 3 1 2 1 4 Q4 R7 R8 TRANSFORMER LOAD N FIGURE 4. Reverse Phase Dimmer (Option 1) C1 = 100uF C2 = 0.0047uF C3 = 0.047uF C4 = 0.1uF R1 = 150kΩ * R1 = 270kΩ, 1/2W R2 = 390Ω R3 = 39kΩ R4 = 1.5MΩ R5 = 10kΩ 7636-041709-5 R6 = 150kΩ D4 = 1N4004 * R6 = 270kΩ D5 = 1N4004 R7 = 47kΩ Q1 = MJE340 (or equivalent) * R7 = 91kΩ Q2 = Liteon LTV354T (or equivalent) R8 = 47kΩ Q3 = IRF630 (Typical) * R8 = 91kΩ * Q3 = IRF730 (Typical) R9 = 0.25Ω, 1W (For 1 Amp RMS Max) Q4 = IRF630 (Typical) * Q4 = IRF730 (Typical) R10 = 4.3kΩ, 1/2W D1 = 12V, 1/2W, 5% D2 = 5.6V, 1/4W, 10% All Resistors 1/4W, All Capacitors 25V unless otherwise specified D3 = 1N4004 * = Component change for 220VAC P V DD R2 + C1 D1 D5 R10 Q1 D4 D2 + R1 U3 1 2 R3 GATE V DD 3 4 C2 MODE V SS TEST OVC SYNC SENS/ 8 7 Q3 EXT SWITCH 3 R8 6 5 2 1 C4 R9 LS7636 R4 3 - R5 2 SENSE SWITCH D3 C3 1 4 Q2 R6 R7 TRANSFORMER LOAD N FIGURE 5. Reverse Phase Dimmer (Option 2) C1 = 100uF C2 = 0.0047uF C3 = 0.047uF C4 = 0.1uF R1 = 150kΩ * R1 = 270kΩ, 1/2W R2 = 390Ω R3 = 39kΩ R4 = 1.5MΩ R5 = 150kΩ 7636-041709-6 R6 = 47kΩ D3 = 1N4004 * R6 = 91kΩ D4 = 1N4004 R7 = 47kΩ D5 = DF02 * D5 = DF04 * R7 = 91kΩ R8 = 10kΩ Q1 = MJE340 (or equivalent) R9 = 0.25Ω, 1W (For 1 Amp RMS Max) Q2 = Liteon LTV354T (or equivalent) R10 = 4.3kΩ, 1/2W Q3 = IRF630 (Typical) * Q3 = IRF730 (Typical) D1 = 12V, 1/2W, 5% D2 = 5.6V, 1/4W, 10% All Resistors 1/4W, All Capacitors 25V unless otherwise specified * = Component change for 220VAC V DD D1 TO SENS, PIN 5 TOUCH OUTPUT R1 Q1 Q2 R3 R2 TOUCH PLATE R1 = 1M D1 = 1N4148 R2 = 1M Q1 = MPS8599 R3 = 220k Q2 = MPS8099 R4 = 100k R5 = 510k R4 R5 All Resistors 1/4W FIGURE 6. Application Circuit For Touch Control Operation The Application Circuit shown in Figure 6 can be applied to the Reverse Dimmer circuits shown in Figure 4 (Option 1) and Figure 5 (Option 2). The Touch Output is connected to the SENSE input (Pin 5) of LS7636. When using the circuit shown in Figure 6, the following components must be removed in Figure 4 and Figure 5: Figure 4 - Remove R6, D5, EXT SWITCH and SENSE SWITCH. C3 remains. Figure 5 - Remove R5, D3, EXT SWITCH and SENSE SWITCH. C3 remains. 7636-041809-7