LS7635FO datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Analog mixed-signal IC> The signal circuit> LS7635FO

LS7635FO: DescriptionAnalog Circuit; CategoryAnalog mixed-signal IC The signal circuit; File Size62KB，4 Pages; ManufacturerLSI Computer Systems; Websitehttps://lsicsi.com

Download Datasheet Parametric View All

LS7635FO Overview

Analog Circuit

LS7635FO Parametric

Parameter Name	Attribute value
Maker	LSI Computer Systems
package instruction	,
Reach Compliance Code	compliant

Preview

Download Datasheet

View All

LSI/CSI

LS7634 LS7635

LS7634FO LS7635FO

(631) 271-0400 FAX (631) 271-0405

September 2006

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

A3800

TOUCH CONTROL HALOGEN LAMP DIMMER

FEATURES:

• Touch or pushbutton control of incandescent lamps

and transformer-coupled halogen lamps

• Works with Magnetic or ElectronicTransformers

• Automatic Safety Shutdown

• Three operating modes

• Extension input for remote activation

• 50Hz/60Hz AC line frequency

• +5V Power Supply (V

- V

)

• LS7634, LS7635 (DIP); LS7634-S, LS7635-S (SOIC);

LS7634FO, LS7635FO (DIP);

LS7634FO-S, LS7635FO-S (SOIC)

- See Figure 1 -

PIN ASSIGNMENT - TOP VIEW

LSI

(+V )

MODE

TRIG

(-V )

LS7634

LS7635

TEST

EXT

SYNC

SENS

FIGURE 1

INPUT/OUTPUT DESCRIPTION:

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:

A typical electronic dimmer may not operate properly with the in-

ductive load encountered when driving a transformer-coupled

low-voltage halogen lamp. The inductive load can cause a

phenomenon called half-waving, wherein the triac fires in al-

ternate half-cycles only, which may lead to the thermal de-

struction of the load transformer. The problems encountered in

driving an inductive load are addressed by the LS7634/LS7635

family of CMOS ICs as follows:

1. Delayed triac cut-off.

When a trigger pulse is due to occur at a conduction

angle which coincides with the on-state of the triac, the

trigger pulse is delayed until the triac has turned off. This

eliminates the underlying cause of half-waving.

2. Delayed triac turn-on and safety shutdown

With inductive loads, the holding current needed to maintain

the triac On-State, may seriously lag behind the gate trigger

signal causing the triac to turn off prematurely. If the

frequency of occurrences of the delayed turn-on exceeds

a preset threshold, a shutdown is initiated by turning

off the triac trigger pulses. The safety-shutdown threshold

value is accumulated in a 4-bit Up/Down counter.

The count increments for every occurrence of delayed

turn-on and decrements once every 8 SYNC pulses

(AC line cycles). The counter will not decrement below zero.

If the count reaches 15, the safety-shut-down is effected.

(Pin 1) Supply voltage positive terminal.

Vss

(Pin 7) Supply voltage negative terminal.

MODE

(Pin 2) - See Table 1

All variations of LS7634 and LS7635 can operate in 3 different

modes. The 3-state MODE input selects the operating modes:

Vss = Mode 0; Float = Mode 1; V

= Mode 2

SYNC

(Pin 4) - See Figure 6

The AC line frequency is applied to this input. All internal timings

are synchronized to the AC. The Load On/Off status information

is also derived from this input.

SENS

(Pin 5) - See Table 1

A Logic 0 applied to this input alters the TRIG 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 touch

and the prior state of TRIG output.

EXT

(Pin 6)

Same functionality as the SENS input, except that a Logic 1 is the

active level at this input. EXT input is intended to be operated

from a remote site with long cable connection, when noise can be

expected. The sampling method used at this input makes it less

sensitive to noise.

TRIG

(Pin 8)

The TRIG output is a low level pulse occurring once every half-

cycle of the AC and is intended to drive the gate of a triac in se-

ries with the load. The conduction angle, ø, of the TRIG pulse can

be varied by means of LONG and SHORT touches at either the

SENS or the EXT input.

Test

(Pin 3)

For factory use only.

7634/7635-090606-1

Recommended Resources

Preamplifier Practical Circuit Diagram

Electromechanical control one-way starting full-wave rectification energy consumption braking control circuit

Three-phase motor phase sequence and phase failure protection circuit

Sanle brand WP-650A computerized microwave oven circuit diagram

Battery backup power circuit diagram using TL499A

Electron tube common screen pole load type inverter circuit

What are the selling points of network cameras and hard disk recorders?: Nowadays, network cameras and hard disk recorders are two products that are controversial in the security industry. What are their selling points? Professionals can help analyze them: loveliness:...; xyh_521 Industrial Control Electronics

The XMC4800 Relax EtherCAT Kit you want is here, apply for it quickly!: [size=4][b][color=#ff0000]Origin of the activity:[/color][/b]Not long ago, a netizen posted on the forum [url=https://bbs.eeworld.com.cn/thread-1059861-1-1.html] hoping that the forum would help organ...; okhxyyo MCU

When XDS100USB is connected to the target, the following prompt pops up: CLA_0: Trouble Writing Memory Block at 0x0 on Page 0 of Length 0x2: (Error -1 @ 0x1452) This '-1' value should be returned only during code development. It is a temporary value used when a more approp...; l0700830216 DSP and ARM Processors

LPC1114 EEPROM Issues: Using Flash to simulate EEPROM, installing NXP official examples, NXP is from Keil, I need to port to IAR, these two sentences are wrong: [color=Red] static UNSIGNED8 mSectorMemory1[SECTOR_SIZE]__attr...; lattice1 NXP MCU

Ask the moderator: The impact of USB module and ADC: In product development, it is found that USB seems to affect the accuracy of ADC?That is, when periodically sampling data, using the USB function, the data waveform willhave some irregular burrs, and ...; moto_jfx stm32/stm8

Should I choose CCTV or IP camera for video surveillance?: Whether it is for personal safety or property safety, it is a good idea to use video surveillance. Video surveillance not only helps to detect and stop ongoing criminal activities in a timely manner, ...; xyh_521 Industrial Control Electronics

Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

Popular Components