ATMEL Corporation T2117-TAS, T2117-TAQ Datasheet

Loading...

T2117

Zero-Voltage Switch with Adjustable Ramp

Description

The integrated circuit, T2117, is designed as a zerovoltage switch in bipolar technology. It is used to control resistive loads at mains by a triac in zero-crossing mode.

A ramp generator allows power control function by period group control, whereas full-wave logic guarantees that full mains cycles are used for load switching.

Features

Direct supply from the mains

Current consumption 0.5 mA

Very few external components

Full-wave drive ± no DC current component in the load circuit

Negative output current pulse typ. 100 mA ± short-circuit protected

Simple power control

Ramp generator

Reference voltage

Applications

Full-wave power control

Temperature regulation

Power blinking switch

Block Diagram

 

 

 

 

 

 

 

D1

BYT41M

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

220 k

R2

R1

18 k

Load

 

 

 

 

 

 

(250 V~)

(Rsync)

2 W

1000 W

 

 

 

 

 

 

 

 

C

R4

 

 

 

 

 

 

±VS

C

 

 

 

2

 

8

 

5

 

2

100 k

 

 

 

 

1

 

2.2 F/

1

 

 

 

 

 

7

100 F/

VM =

 

 

Ramp

 

 

 

230 V~

10 V

 

 

 

Synchronization

Supply

16 V

 

 

 

generator

 

 

 

 

 

 

 

 

GND

TIC

 

 

R5

 

 

 

 

 

 

236N

MT2

 

 

 

 

 

 

 

 

 

12 k

3

 

 

 

 

 

6

100

 

 

 

 

+

 

Full-wave logic

 

MT1

max

 

4

+

 

 

Pulse

R3

 

 

 

 

±

Comparator

 

 

 

 

 

100 k

 

 

 

 

amplifier

 

 

 

 

 

 

 

 

 

 

min

 

 

 

Reference voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R6

 

 

1.4 V

 

 

T2117

 

 

 

 

 

 

 

 

 

 

 

 

 

18 k

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

Figure 1. Block diagram with typical circuit, period group control 0 to 100%

Ordering Information

Extended Type Number

Package

Remarks

 

 

 

T2117-3AS

DIP8

Tube

 

 

 

T2117-TAS

SO8

Tube

 

 

 

T2117-TAQ

SO8

Taped and reeled

 

 

 

 

 

 

Rev. A2, 17-Dec-01

 

1 (11)

T2117

 

 

 

 

 

Pin Description

 

 

 

 

Ramp

1

8

Vsync

 

T2117

 

 

CRamp

2

7

GND

 

Ramp

 

 

T2117

1

 

control

 

 

 

 

 

POSIN

3

6

Output

 

 

 

 

 

R4

2

C2

 

 

 

 

NEGIN

4

5

VS

 

±VS

 

 

 

 

 

 

 

 

Figure 2. Pinning

 

 

 

 

Pin

Symbol

 

Function

1

Ramp

 

Ramp output

 

 

 

 

2

CRamp

 

Ramp capacitor

3

POSIN

 

Non-inverting comparator input

 

 

 

 

4

NEGIN

 

Inverting comparator input

 

 

 

 

5

VS

 

Supply voltage

6

Output

 

Trigger pulse output

 

 

 

 

7

GND

 

Ground

 

 

 

 

8

Vsync

 

Voltage synchronization

General Description

The integrated circuit T2117 is a triac controller for zerocrossing mode. It is designed to control power in switching resistive loads of mains supplies.

Information regarding supply sync. is provided at Pin 8

via resistor RSync. To avoid DC load on the mains, the fullwave logic guarantees that complete mains cycles are

used for load switching.

A fire pulse is released when the inverting input of the comparator is negative (Pin 4) with respect to the noninverting input (Pin 3) and internal reference voltage. A ramp generator with free selectable duration can be performed by capacitor C2 at Pin 2. The ramp function is used for open-loop control (figure 4), but also for application with proportional band regulation (figure 11). Ramp voltage available at capacitor C2 is decoupled across the emitter follower at Pin l. To maintain the lamp flicker specification, ramp duration is adjusted according to the controlling load. In practice, interference should be avoided (temperature control). Therefore, a two-point control is preferred to proportional control. One can use internal reference voltage for simple applications. In that case, Pin 3 is inactive and connected to Pin 7 (GND), see figure 13.

Figure 3. Pin 1 internal network

 

t

V1

Final voltage

±1.6 V

Vmin

 

±7.6 V

Initial voltage

Vmax

T

Figure 4. Threshold voltage of the ramp at VS = ±8.8 V

Triac Firing Current (Pulse)

This depends on the triac requirement. It can be limited with gate series resistance which is calculated as follows:

RGmax

7.5 V ± VGmax

± 36

 

IGmax

 

 

 

 

 

 

IP =

 

IGmax

 

tp

 

 

 

 

T

 

 

 

 

 

 

 

 

 

where:

 

 

 

 

 

 

 

 

 

VG

= Gate voltage

 

 

 

 

IGmax

= Maximum gate current

 

Ip

= Average gate current

 

 

tp

= Firing pulse width

 

 

 

 

T

= Mains period duration

 

Firing Pulse Width tp (Figure 5)

This depends on the latching current of the triac and its load current. The firing pulse width is determined by the zero-crossing detection which can be influenced with the help of sync. resistance, Rsync, (figure 6).

2

IL VM

tp =

arc. sin

 

 

 

P

2

 

2 (11)

Rev. A2, 17-Dec-01

ATMEL Corporation T2117-TAS, T2117-TAQ Datasheet

T2117

whereby:

 

IL

=

Latching current of the triac

VM

=

Mains supply, effective

P

=

Power load (user's power)

Total current consumption is influenced by the firing pulse width which can be calculated as follows:

 

tp

) 0.6 V

VM 2 sin ( 2

Rsync

3.5 10 5A

49 k

10.00

VMains = 230 V

 

 

 

1.00

 

 

 

t p ( ms )

 

 

IL ( mA)

0.10

 

 

 

 

 

 

 

 

200

 

 

 

100

0.01

 

 

50

 

 

 

10

100

1000

10000

 

P ( W )

 

Figure 5. Output pulse width

 

2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

)

1600

 

 

 

VMains

 

= 230

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

( kOhm

1200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rsync

800

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

200

400

600

800

1000

1200

1400

tp ( s )

Figure 6. Synchronization resistance

Supply Voltage

The T2117 contains voltage limiting and can be connected with the mains supply via the diode D1 and the resistor R1. Supply voltage between Pin 5 and 7 is limited to a typical value of 9.5 V.

Rev. A2, 17-Dec-01

The series resistance R1 can be calculated (figures 7 and 8) as follows:

 

 

 

 

V

V

 

 

 

 

 

(V

M ±

V )2

R

1max

= 0.85

Mmin ±

Smax

; P

(R1)

=

 

 

 

 

 

 

S

 

2 Itot

 

 

 

 

 

 

 

 

2 R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Itot

= IS + IP + Ix

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

whereby:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VM

= Mains voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VS

= Limiting voltage of the IC

 

 

 

 

 

 

 

 

 

 

Itot

= Total current consumption

 

 

 

 

 

 

 

 

 

 

IS

 

= Current requirement of the IC (without load)

Ix

 

= Current requirement of other peripheral

 

 

components

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P(R1)

= Power dissipation at R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

)

 

 

 

 

 

 

VMains

 

=230V

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

( k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

3

6

 

 

9

 

12

 

 

15

 

 

 

 

 

 

 

 

 

Itot ( mA )

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 7. Maximum resistance of R1

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VMains

 

=230V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

( W )

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

3

6

 

 

9

 

12

 

 

15

 

Itot ( mA )

Figure 8. Power dissipation of R1 according to current consumption

3 (11)

T2117

Absolute Maximum Ratings

Parameter

 

Symbol

Value

Unit

 

 

 

 

 

Supply current

Pin 5

±IS

30

mA

Sync. current

Pin 8

ISync.

5

mA

Output current ramp generator

Pin 1

IO

3

mA

Input voltages

Pin 1, 3, 4, 6

±VI

VS

V

 

Pin 2

±VI

2 to VS

V

 

Pin 8

±VI

7.3

V

Power dissipation

 

 

 

 

Tamb = 45°C

 

Ptot

400

mW

Tamb = 100°C

 

Ptot

125

mW

Junction temperature

 

Tj

125

°C

Operating ambient temperature range

 

Tamb

0 to 100

°C

Storage temperature range

 

Tstg

±40 to + 125

°C

Thermal Resistance

 

Parameter

Symbol

Value

Unit

 

 

 

 

 

Junction ambient

SO8

RthJA

200

K/W

Junction ambient

DIP8

RthJA

110

K/W

Electrical Characteristics

±VS = 8.8 V, Tamb = 25°C, reference point Pin 7, unless otherwise specified

Parameter

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

 

 

 

 

 

 

 

 

Supply-voltage limitation

±IS = 1 mA

Pin 5

±VS

9.0

9.5

10.0

V

 

±IS = 10 mA

Pin 5

±VS

9.1

9.6

10.1

V

Supply current

 

Pin 5

±IS

 

 

500

A

Voltage limitation

I8 = ± 1 mA

Pin 8

± VI

7.7

8.2

8.7

V

Synchronization current

 

Pin 8

±Isync

0.12

 

 

mA

Zero detector

 

Pin 8

±Isync

 

35

 

A

Output pulse width

VM= 230 V ,

 

 

 

 

 

 

 

Rsync = 220 k

Pin 6

tP

 

260

 

s

 

Rsync = 470 k

Pin 6

tP

 

460

 

s

Output pulse current

V6 = 0 V

Pin 6

±IO

100

 

 

mA

Comparator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input offset voltage

 

Pin 3,4

± VI0

 

 

15

mV

Input bias current

 

Pin 4

IIB

 

 

1

A

Common-mode input

 

Pin 3,4

±VIC

1

 

(VS±1)

V

voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Threshold internal

V3 = 0 V

Pin 4

±VRef

 

1.4

 

V

reference

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 (11)

 

 

 

 

 

Rev. A2, 17-Dec-01

+ 7 hidden pages