MOTOROLA UAA2016D, UAA2016P Datasheet

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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.

• 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

ZERO VOLTAGE SWITCH

POWER CONTROLLER

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

Representative Block Diagram

Failsafe

Sense Input

Temperature

Reduction

Hysteresis

Adjust

Voltage

Reference

4–Bit DAC

11–Bit Counter

+ –

Sampling

Full Wave

Logic

1/2

Synchronization

Sync

MOTOROLA ANALOG IC DEVICE DATA

Internal

Reference

UAA2016

Pulse

Amplifier

Supply

Voltage

PIN CONNECTIONS

Output

ref

Hys. Adj.

Sensor

Temp. Reduc.

1 2

3 4

(Top View)

8 7 6 5

Sync V

CC Output V

ORDERING INFORMATION

Operating

Device

UAA2016D UAA2016P

 Motorola, Inc. 1999 Rev 6

Temperature Range

TA = – 20° to +85°C

Package

SO–8

Plastic DIP

MAXIMUM RATINGS

(Voltages referenced to Pin 7)

Rating Symbol Value Unit

Supply Current (I

) I

Pin 5

Non–Repetitive Supply Current

(Pulse Width = 1.0 µs) AC Synchronization Current I Pin Voltages V

Current Sink I

ref

Output Current (Pin 6)

(Pulse Width < 400 µs) Power Dissipation P Thermal Resistance, Junction–to–Air R Operating Temperature Range T

UAA2016

CCP

sync

Pin 2

Pin 3

Pin 4

Pin 6

Pin 1

θJA

15 mA

200 mA

3.0 mA

0; V

ref

0; V

ref

0; V

ref

0; V

1.0 mA

150 mA

625 mW 100 °C/W

– 20 to + 85 °C

ELECTRICAL CHARACTERISTICS (T

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

Characteristic Symbol Min Typ Max Unit

Supply Current (Pins 6, 8 not connected)

(TA = – 20° to + 85°C) Stabilized Supply Voltage (Pin 5) (ICC = 2.0 mA) V Reference Voltage (Pin 1) V Output Pulse Current (TA = – 20° to + 85°C)

= 60 W, VEE = – 8.0 V)

out

Output Leakage Current (V

= 0 V) I

out

Output Pulse Width (TA = – 20° to + 85°C) (Note 1)

(Mains = 220 Vrms, R

sync

= 220 kΩ) 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)

Internal Hysteresis Voltage

(Pin 2 Not Connected)

Additional Hysteresis (Note 4)

(Pin 2 Connected to VCC)

Failsafe Threshold (TA = – 20° to + 85°C) (Note 7) V

NOTES: 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.

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 the NTC resistor increases quickly. This can cause the sensor input voltage to reach the failsafe threshold, thus inhibiting 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

EE ref

OL T

off

FSth

— 0.9 1.5

–10 – 9.0 – 8.0 V

– 6.5 – 5.5 – 4.5 V

90 100 130 — — 10 µA

50 — 100

–10 — +10 mV

— — 0.1 µA

S S

— 40.96 — sec 50 70 90 mV

280 350 420

— 10 —

280 350 420 180 — 300 mV

. Refer to application curves.

sync

µs

MOTOROLA ANALOG IC DEVICE DATA

UAA2016

Figure 1. Application Schematic

def

NTC

Sense Input

Temp. Red.

Hys

Adj

ref

Failsafe

4–Bit DAC

11–Bit Counter

–

1/2

Sampling

Full Wave

Logic

Synchronization

Sync

sync

Internal

Reference

UAA2016

Pulse

Amplifier

Supply

Voltage

Output

out

MAC212A8

220 Vac

Load

APPLICATION INFORMATION

(For simplicity , the LED in series with R

is omitted in the

out

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 Vrms, a good triac choice is the Motorola 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 Ω. 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:

Load

(Vrms

sin(2pft)–VTM)ńR

where VTM is the maximum on state voltage of the triac, f is 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.

Supply

and Filter Capacitor

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.

T emperature Reduction Determined by R

(Refer to Figures 13 and 14.)

MOTOROLA ANALOG IC DEVICE DATA

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