ON Semiconductor UAA2016 Technical data

UAA2016

Zero Voltage Switch
Power Controller

The UAA2016 is designed to drive triacs with the Zero Voltage
technique which allows RFI−free power regulation of resistive loads.
Operating directly on the AC power line, its main application is the
precision regulation of electrical heating systems such as panel heaters
or irons.

A built−in digital sawtooth waveform permits proportional
temperature regulation action over a ±1°C band around the set point.
For energy savings there is a programmable temperature reduction
function, and for security a sensor failsafe inhibits output pulses when
the sensor connection is broken. Preset temperature (i.e. defrost)
application is also possible. In applications where high hysteresis is
needed, its value can be adjusted up to 5°C around the set point. All
these features are implemented with a very low external component
count.

Features

• Zero Voltage Switch for Triacs, up to 2.0 kW (MAC212A8)

• Direct AC Line Operation

• Proportional Regulation of Temperature over a 1°C Band

• Programmable Temperature Reduction

• Preset Temperature (i.e. Defrost)

• Sensor Failsafe

• Adjustable Hysteresis

• Low External Component Count

• Pb−Free Packages are Available

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ZERO VOLTAGE SWITCH

POWER CONTROLLER

PDIP−8

8

1

8

1

x = A or D
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G, G = Pb−Free Package
(Note: Microdot may be in either location)

P SUFFIX

CASE 626

SOIC−8

D SUFFIX

CASE 751

MARKING

DIAGRAMS

UAA2016P

AWL

YYWWG

8

2016x
ALYW

G

1

Failsafe

Sense Input

Temperature

Reduction

Hysteresis

Adjust

Voltage

Reference

3

4

2

1

4−Bit DAC

11−Bit Counter

(Sawtooth
Generator)

+

−

+

+

+

1/2

Synchronization

Figure 1. Representative Block Diagram

© Semiconductor Components Industries, LLC, 2006

January, 2006 − Rev. 9

Sampling

Full Wave

Logic

8

Sync

Internal

Reference

UAA2016

Pulse

Amplifier

Supply

Voltage

V

6

Output

7

+V

CC

Temp. Reduc.

PIN CONNECTIONS

V

1

ref

Sensor

2

3

4

(Top View)

Hys. Adj.

Sync

8

V

7

6

Output

V

5

ORDERING INFORMATION

See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.

5

EE

1 Publication Order Number:

UAA2016/D

CC

EE

UAA2016

MAXIMUM RATINGS (Voltages referenced to Pin 7)

Rating

Supply Current (I

) I

Pin 5

Non−Repetitive Supply Current, (Pulse Width = 1.0 ms)
AC Synchronization Current I
Pin Voltages V

V

Current Sink I

ref

Output Current (Pin 6), (Pulse Width < 400 ms)
Power Dissipation P
Thermal Resistance, Junction−to−Air
Operating Temperature Range T

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

ELECTRICAL CHARACTERISTICS (T

= 25°C, VEE = −7.0 V, voltages referred to Pin 7, unless otherwise noted.)

A

Characteristic Symbol Min Typ Max Unit

Supply Current (Pins 6, 8 not connected), (TA = − 20° to + 85°C) I
Stabilized Supply Voltage (Pin 5), (ICC = 2.0 mA) V
Reference Voltage (Pin 1) V
Output Pulse Current (TA = − 20° to + 85°C), (R
Output Leakage Current (V

= 0 V) I

out

Output Pulse Width (TA = − 20° to + 85°C) (Note 1), (Mains = 220 Vrms, R

= 60 W, VEE = − 8.0 V) I

out

= 220 kW)

sync

Comparator Offset (Note 5) V
Sensor Input Bias Current I
Sawtooth Period (Note 2) T
Sawtooth Amplitude (Note 6) A
Temperature Reduction Voltage (Note 3), (Pin 4 Connected to VCC) V
Inter n a l Hysteresis Voltage, (Pin 2 Not Connected) V
Additional Hysteresis (Note 4), (Pin 2 Connected to VCC) V
Failsafe Threshold (TA = − 20° to + 85°C) (Note 7) V

1. Output pulses are centered with respect to zero crossing point. Pulse width is adjusted by the value of R

2. The actual sawtooth period depends on the AC power line frequency. It is exactly 2048 times the corresponding period. For the 50 Hz case

it is 40.96 sec. For the 60 Hz case it is 34.13 sec. This is to comply with the European standard, namely that 2.0 kW loads cannot be connected
or removed from the line more than once every 30 sec. The inertia of most heating systems combined with the UAA2016 will comply with
the European Standard.

3. 350 mV corresponds to 5°C temperature reduction. This is tested at probe using internal test pad. Smaller temperature reduction can be

obtained by adding an external resistor between Pin 4 and VCC. Refer to application curves.

4. 350 mV corresponds to a hysteresis of 5°C. This is tested at probe using internal test pad. Smaller additional hysteresis can be obtained

by adding an external resistor between Pin 2 and VCC. Refer to application curves.

5. Parameter guaranteed but not tested. Worst case 10 mV corresponds to 0.15°C shift on set point.

6. Measured at probe by internal test pad. 70 mV corresponds to 1°C. Note that the proportional band is independent of the NTC value.

7. At very low temperature t he N TC r esistor increases quickly . This c an c ause t he s ensor i nput v oltage t o r each t he f ailsafe t hr eshold, t hus i nhibiting

output pulses; refer to application schematics. The corresponding temperature is the limit at which the circuit works in the typical application.
By setting this threshold at 0.05 V

, the NTC value can increase up to 20 times its nominal value, thus the application works below − 20°C.

ref

Symbol Value Unit

15 mA

200 mA

3.0 mA

0; V
0; V
0; V

0; V

ref
ref
ref
EE

V

1.0 mA
150 mA
625 mW
100 °C/W

− 20 to + 85 °C

− 0.9 1.5 mA

90 100 130 mA

− − 10

50 − 100

− − 0.1

mA
ms

mA

− 40.96 − sec

50 70 90 mV

− 10 − mV

. Refer to application curves.

sync

I

V
V
V

R

CC
CCP
sync

Pin 2
Pin 3
Pin 4
Pin 6

Pin 1

I

O

q

A

CC

EE
ref
O

OL

T

off
IB

TR

IH

FSth

D
JA

−10 −9.0 −8.0 V

−6.5 −5.5 −4.5 V

P

−10 − +10 mV

S
S

280 350 420 mV

280 350 420 mV

H

180 − 300 mV

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2

UAA2016

S2

S1

R

S

R

R

def

2

NTC

R

1

Sense Input

Temp. Red.

R

3

3

4

2

Hys

Adj

1

V

ref

Failsafe

++

+

4−Bit DAC

11−Bit Counter

+

−

1/2

Synchronization

Sync

R

sync

Sampling

Full Wave

Logic

Internal

Reference

8

UAA2016

Pulse

Amplifier

Supply

Voltage

V

EE

R

S

MAC212A8

R

6

7

5

Output

+V

C

out

CC

220 Vac

F

Load

Figure 1. Application Schematic

APPLICATION INFORMATION

(For simplicity, the LED in series with R

is omitted in

out

the following calculations.)

Triac Choice and R

Determination

out

Depending on the power in the load, choose the triac that
has the lowest peak gate trigger current. This will limit the
output current of the UAA2016 and thus its power
consumption. Use Figure 4 to determine R

according to

out

the triac maximum gate current (IGT) and the application
low temperature limit. For a 2.0 kW load at 220 V rms, a good
triac choice is the ON Semiconductor MAC212A8. Its
maximum peak gate trigger current at 25°C is 50 mA.

For an application to work down to − 20°C, R

should be

out

60 W. It is assumed that: IGT(T) = IGT(25°C)  exp (−T/125)
with T in °C, which applies to the MAC212A8.

Output Pulse Width, R

The pulse with TP is determined by the triac’s I

sync

Hold

, I

Latch

together with the load value and working conditions
(frequency and voltage):

Given the RMS AC voltage and the load power, the load
value is:

RL = V2rms/POWER

The load current is then:

I

+ (Vrms 2Ǹ sin(2pft)–VTM)ńR

where V

Load

is the maximum on state voltage of the triac, f is

TM

L

the line frequency.

Set I

Load

= I

for t = TP/2 to calculate TP.

Latch

Figures 6 and 7 give the value of TP which corresponds to
the higher of the values of I
VTM= 1.6 V. Figure 8 gives the R

Hold

and I

sync

, assuming that

Latch

that produces the

corresponding TP.

R

and Filter Capacitor

Supply

With the output current and the pulse width determined as
above, use Figures 9 and 10 to determine R
that the sinking current at V

pin (including NTC bridge

ref

Supply

, assuming

current) is less than 0.5 mA. Then use Figure 11 and 12 to
determine the filter capacitor (CF) according to the ripple
desired on supply voltage. The maximum ripple allowed is

1.0 V.

Temperature Reduction Determined by R

1

(Refer to Figures 13 and 14.)

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3

UAA2016

Room

Temperature

T (°C)

Heating

Power

P(W)

Proportional Band

Proportional Temperature Control

DReduced Overshoot
DGood Stability

Time (minutes, Typ.)

Overshoot

Time (minutes, Typ.)

Time (minutes, Typ.)Time (minutes, Typ.)

ON/OFF Temperature Control

DLarge Overshoot
DMarginal Stability

Figure 2. Comparison Between Proportional Control and ON/OFF Control

TP is centered on the zero−crossing.

T

P

AC Line

Waveform

Gate Current

Pulse

14xR

TP+

 ) 7  10

sync

Ǹ

Vrms  2

 xpf

I

Hold

I

Latch

5

(μs)

f = AC Line Frequency (Hz)

Vrms = AC Line RMS Voltage (V)

R

= Synchronization Resistor (W)

sync

Figure 3. Zero Voltage Technique

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