ST STCC05-B User Manual

®

STCC05-B

HOME APPLIANCE CONTROL CIRCUIT

APPLICATIONS

■ Home Appliance digital control

■ AC Power drive and functional safety management

■ Air Conditioner, Refrigerator and Oven applications

■ Compressor, fan, heater and valve drive circuit

FEATURES

■ Wide range input supply voltage operation:

7 to 18V

■ 5 V +/- 5% full tolerance voltage regulator and

50mA output current

■ MCU reset circuit with activation delay time and

hysteresis (3.75V Hi, 3.4V Lo)

■ 30µs digitally filtered inverting Zero Voltage

Synchronization

■ Three 50mA relay coil drivers with demagnetiz-

ing diode

■ One 150mA relay coil driver with demagnetizing diode for a 20A relay

■ One 30mA peak enhanced buzzer driver with enable pin and soft turn off

■ 12 to 5V robust non inverting level shifter for speed sensor or door switch interface

■ Ambient temperature: - 20 to 85°C

Table 1. Order Code

Part Number Marking

STCC05-BD4 STCC05-B

DIP-20

BENEFITS

■ Higher module compactness with reduced component count

■ Drastic reduction of soldered pins on the board for lower use of lead metal

■ Faster module assembly time

■ High transient burst immunity and ESD robustness compliant with IEC61000-4 standards

■ Enhanced functional reliability

■ Enhanced circuit parametric quality

■ Easy to design for short time to market

Figure 1: STCC05 based Air Conditioner application diagram

SMPS

AC Line

V

PS

COMPRESSOR RELAY

POWER RELAYS

R

S

V

PS

V

PS

BUZZER

COM

V

VPSV

RL

4

V

VPSV

RL

3

V

VPSV

RL

2

V

VPSV

RL

1

BZ

2

BZ

1

V

PS

SYN

IN

S

R

INS

V

PS

STCC05

PS

V

VPSV

PS

5V REGULATOR

ZEROVOLTS SYNC.

LEVEL SHIFTER

JP

V

PS

30µs FILTER

EMI FILTER

RELAYDRIVER

RESET

20A RELAY

DRIVER

BUZZER DRIVER

IN

EN

IN

V

RST\

ZVS

OUT

4

3

2

1

BZ

DD

P

PWM

V

/RS T

04

03

02

01

06

DD

V

DD

V

C

SS

DD

NMI

S

C

P

07

UP

MCU

October 2004 REV. 1

SPEED

SENSOR

1/13

STCC05-B

Figure 2. Block diagram Figure 3. Pin-out connections

V

PS

RL

BZ

VP

COM

SYN

IN

4

3

2

1

2

1

S

V

PS

V

PS

V

PS

V

PS

5V REGULATOR

ZERO VOLTS SYNC.

LEVEL SHIFTER

V

PS

RESET

30µs FILTER

EMI FILTER

20A RELAY

RELAY DRIVER

DRIVER

BUZZER

DRIVER

IN

EN

IN

V

DD

RST\

ZVS

OUT

4

3

2

1

BZ

S

V

PS

SYN /RST

IN

RL

BZ

EN

BZ

1

2

3

S

4

1

5

2

6

3

7

4

8

1

9

2

10

20

19

18

17

16

15

14

13

12

11

V

DD

ZVS

OUT

IN

1

IN

2

IN

3

IN

4

IN

BZ

COM

S

FUNCTIONAL DESCRIPTION

The STCC05 is a control circuit embedding most of the analog & power circuitry of an air conditioner or refrigirator control module. It interfaces the micro-controller MCU with the AC power and cooling process sections.

■ The voltage supply

The 5V voltage regulator supplies the micro-controller MCU. Its input voltage ranges from 7V to 18V; and its average DC output current up to 50mA. With an output filtering capacitor of 100µF, its output voltage accuracy is better than +/- 5% in the whole operating range of the ambient temperature T current I

and the input voltage VPS , contributing directly to the ADC accuracy.

DD

AMB

, the load

The regulator includes also an over current limiter and a thermal shutdown. The over current limiter protects the regulator against output short circuits and inrush currents during the power up. The current limiter is made of a serial shunt resistance as current sensor and a circuit that regulates the input current. Moreover, the thermal shutdown protects the whole circuit against overload operations. It is made of a thermal sensing junction and a hysteresis comparator that is able to switch off the passing element.

R

1.25 V

SENSE

Over current

Limiter

R

1

V

DD

V

DD

6kΩ

3kΩ

/RST

CUP=

100nF

V

DD

R

2

V

H

V

L

VH= 3.75 V

= 3.40 V

V

L

MCU

V

DD

RUP> 100kΩ

RESET

V

PS

Thermal

Shutdown

Reference

2/13

V

DD

STCC05-B

■ The reset circuit

This circuit ensures a Low Voltage Detection (LVD) of the output of the regulator. Most micro-controllers have an active RESET pin in the low state: so, the /RST pin will be active at low state. The reset comparator senses the regulator voltage V the high threshold V low threshold V These delays are set by an external capacitor C thresholds of /RST: For C

■ The Zero Voltage Synchronization ZVS circuit

= 3.75V and after a delay time TUP; and is low when the VDD decreases below the

H

= 3.4V after the delay time TDW.

L

UP

= 100nF, TUP= 400µs with VTH= VH/2; TDW= 200µs with VTH= VL/2.

UP

The Zero Voltage Synchronization ZVS circuit generates the signal ZVS that synchronizes the whole operation with the AC line cycle (20 ms on 50 Hz or 16.7 ms on 60 Hz). This signal allows the MCU to control the AC loads and achieve the timing functions. The input pin SYN is an image of the mains voltage. It is connected to either the power supply transformer through a resistor R

or an opto-coupler that is controlled directly by the AC line voltage. The circuit is

ZV

protected against fast line transient voltages: a robust ESD protection and a 30µs digital filter are implemented to provide a higher immunity to the MCU operation. Its output signal ZVS is inverted respect to the input signal V

SYN

.

V

. The /RST pin goes high when VDD is higher than

DD

connected to the /RST pin and depend on the trigger

DD

30 µs FILTER

S

25 kΩ

SYN

70 kΩ

30 kΩ

COM

■ The relay coil drivers

1

Q

S

2

ZVS

These robust circuits allow a DC relay coil to be driven by an MCU output. The relay coil has a minimum resistance of 580Ω and has a power up to 0.25W for V

= 12 V. These characteristics are representative

PS

of 3A relays such as FTR-F3AA-12V or JQ1A-12V series. The output stage is made of a transistor and a demagnetization diode. The transistor is referred to the ground COM, has a DC current rating of 50mA; and its collector is connected to the output RL The diode is connected between the output pin RL

and the supply pin VPS.

I

(I=1, 2, 3).

I

Moreover, a fourth coil driver has an extended 150mA current capability to be able to drive the coil of a relay having a 130Ω minimum resistance and a 1.1W maximum power. These characteristics are representative of 20A relays such as G4A-E-DC12, OMIF-S-112 or UKH12S series.

3/13

STCC05-B

V

PS

V

PS

Demagnetizing Diode

V

IN

■ The buzzer driver with enable control

4kΩ

I

10 kΩ

IN

Relay

Transistor

RL

I

EN

IN

10 kΩ

BZ

V

IN

BZ

R

RBZ=

=1kΩ

OH

BZ

2

1

1kΩ

The MCU can excite a warning buzzer with a 50% PWM signal. The buzzer driver amplifies this signal in current and translates it from the 5V MCU output to the V

supply to produce the right sound level from

PS

the buzzer. The output stage is made of a NPN transistor, a PNP transistor and two 1kΩ resistors. The NPN transistor, referred to the power ground COM, is controlled by the input IN nected to the output BZ The PNP transistor, referred to the V nected to the output BZ

. The input INBZ is driven by a simple push-pull MCU buffer.

1

polarity, is controlled by the input ENBZ; and its collector is con-

PS

through a 1kΩ resistor. The input ENBZ is driven by a simple push-pull MCU

2

; its collector is con-

BZ

buffer. The pin BZ

is the supply terminal of the buzzer; and the circuit has a DC current rating of 9mA and the

2

PWM section runs from 10Hz up to 5kHz. A 1kΩ resistor R over, the addition of an external capacitor-resistor network on BZ off smoothly when the pin EN

■ The speed sensor level shifter

The OUT

signal is generated by an electronic signal such as the indoor fan speed clock issued of a Hall

S

Effect sensor or a door switch signal and is transmitted to the MCU. As the IN

is connected between the BZ1 and BZ2 pins to discharge the buzzer periodically. More-

BZ

pin will allow the buzzer to turn on and

2

is toggling.

BZ

input may be disturbed; a

S

spike suppressor and a simple EMI filter are added to increase the input robustness. The output signal OUT

is not inverted with respect to the input signal INS.

S

4/13

IN

V

DD

V

DD

EMI

50 kΩ

S

Filter

500Ω

OUT

S

50 kΩ

STCC05-B

Table 2: Absolute Ratings (limiting values)

Symbol Pin Parameter name & conditions Value Unit

V

VDD Output supply voltage - 0.3 to 6 V

DD

V

PS

V

SYN

V

MO

V

I

M

I

BZ AV

I

BZ PK

ΣI

P

DIS

T

AMB

T

VPS, IN

S

Power supply voltage, level shifter input - 0.3 to 20 V

SYN ZVS input voltage, RZV = 15kΩ - 1 to 20 V

BZ

, BZ2,

IN1, IN2, IN3

I

ZVS, OUTS, /RST

O

1

RL

, x = 1 to 4

x

V

PS

RL

, x = 1 to 3

x

RL

4

RL

, x = 1 to 4 Maximum diver diode reverse current 1 mA

x

Output voltage

Input logic voltage

Output logic voltage

Maximum sourced current pulse, tp = 10ms 500 mA Maximum sunk driver current pulse, tp = 10ms 60 mA Maximum DC sunk current 50 mA Maximum sunk driver current pulse, tp = 10ms 160 mA Maximum DC sunk current 150 mA

- 0.3 to + 0.3

V

PS

- 0.3 to

V

+ 0.3

DD

- 0.3 to

V

+ 0.3

DD

BZ1, BZ2 Average output current ± 2 mA BZ1, BZ2 Peak output current, tp = 50µs ± 50 mA

Maximum DC sunk current in all relay drivers

M

RLx, l = 1 to 4

= 16V, T

V

PS

Maximum DC sunk current in all relay drivers

= 16V, T

V

PS

= 70°C, IDD= 50mA, DIP-20

AMB

= 85°C, IDD= 25mA, DIP-20

AMB

All Maximum dissipation, DIP-20, T

= 70°C 0.90 W

AMB

220

300

AII Operating ambient temperature - 20 to 85 °C

All

J

Operating junction temperature - 10 to 150 °C Storage junction temperature - 25 to 150 °C

V

mA

Table 3: Electromagnetic Compatibility Ratings

(T

= 25°C, according to typical application diagram of page 1, unless otherwise specified)

J

Symbol Node Parameter name & conditions Value Unit

All pins ESD protection, MIL-STD 883 method 3015, HBM model ± 2

V

ESD

PPB

INS, SYN, V

, V

PS

DD

All pins

V

Note 1: System oriented test circuit with RZV = 15kΩ, R Note 2: System oriented test circuit; refer to application section

ESD protection, IEC 61000-4-2, per intput, in air

ESD protection, IEC 61000-4-2, per intput, in contact

Total peak pulse voltage Burst, IEC 61000-4-4,

= 2.2kΩ and CDD = CPS = 100nF

INS

(1)

(2)

± 2

± 4

Table 4: Thermal Resistance

Symbol Parameter Value Unit

R

th(j-a)

DIP-20 thermal resistance junction to ambient Single PCB with a copper thickness = 35µm and surface S

= 0.5cm

CU

2

90 °C/W

kV

5/13

STCC05-B

Table 5: Electrical Characteristics (TJ = 25°C, VCC = 12V, unless otherwise specified)

Symbol Pin Name Conditions Min. Typ Max. Unit

Voltage supply

= 5 to 40mA

I

DD

T

= 0 to 70°C

amb

V

VDD Output voltage supply

DD

VPS Input supply voltage 7 18 V

V

PS

I

VPS Quiescent supply current VDD = 5V, IDD = 0 (open) 1.3 2 mA

SQ

I

IN_SC

T

OFF

VPS Limiting input current

VDD Shutdown temperature 170 °C

∆T V Releasing thermal hysteresis 15 °C

V

H

V

L

V

Threshold hysteresis 0.35

HYS

T

UP

Disabling reset threshold 3.4 3.75 4 Enabling reset threshold 3.1 3.4 3.6

DD

Disabling reset delay time

/RST

T

Enabling reset delay time

DW

Zero Voltage synchronization circuit

T

ZVS Transition filtering time Rising and falling step 10 30 70 µs

D

SYN Transition threshold 0.6 1.1 1.4 V

V

TH

SYN Input nominal current

I

SYN

Level shifter, zero voltage synchronization, reset circuits

V

LVOUT

OH

V

OL

/RST

ZVS

High level output voltage 0.8 VDD V

Low level output voltage 0.2 VDD V

Relay coil drivers

IN4Input activating current V

RL4 On state output voltage I

IN

RL RL

IN

Input activating current V

1 to 3

On state output voltage ION = 50mA, V

1 to 3

Off state output voltage V

1 to 4

Transition threshold 0.8 1.9 3.1 V

1 to 4

V

I

IN4

V

ON

I

INx

V

ON

RL H

V

INx

Buzzer driver with enable control

V

F

R

V

ENBZ

R

INBZ

BUZ

OH

ON

BZ

INBZ

Buzzer PWM frequency Duty cycle = 50% 0.01 5 kHz

BZ1On state output voltage ION = 25mA, V

ENBZEnable threshold voltage 0.8 2 3.1 V

Input muting voltage 0.8 1.5 3.1 V

BZ2 On state output resistance V

BZ1 - BZ2 Buzzer resistance 1 kΩ

Speed sensor level shifter

V

INS H

V

INS L

I

INS

High level detection 7 18 V

IN

Low level detection 0.8 V

S

Internal input current V

= 9 to 16V

PS

C

= 100µF

DD

V

IN1 to 4

= 0V

VDD = 0V Output in short circuit

4.75 5 5.25 V

50 80 120 mA

Reset circuit

= 100nF, VTH = VH/2,

C

UP

R

= 100kΩ

UP

CUP = 100nF, VTH = VL/2, RUP = 100kΩ

= 5V 0.3

V

SYN

V

= 18V 0.9 1.5

SYN

= 5V 0.85 1.4 mA

IN4

= 150mA, V

ON

= 5V 0.85 1.4 mA

INx

< 50.8V, RL = 580Ω 0.9 V

INx

= 0V, V

INBZ

I

= 5mA

BZ2

V

= 0V, tp = 50µs

ENBZ

= 12V 500 800 µA

INS

> 3.1V 1 1.2 V

IN4

> 3.1V 1 1.2 V

INx

> 3.1V,

ENBZ

> 3.1V,

INBZ

200 400 800

100 200 400

PS

1

11.4 V

V

PS

VV

µs

mA

V

kΩ

6/13

DC CHARACTERISTICS

STCC05-B

Figure 4: Typical regulator voltage V versus its output current I

5.2

Vdd (V)

5.1

5

4.9

4.8

4.7

4.6

4.5

4.4

4.3

4.2

4.1

4

020406080100

Vin = 9V

Vin = 16V

at TJ = 25°C

DD

Figure 6: Typical relay driver R

variation

DD

Idd (mA)

L (1 to 3)

state voltage variation versus its current

1.1 Von (V)

1

0.9

0.8

on-

Figure 5: Typical regulator voltage V versus its junction temperature at V

5.05

5.025

4.975

4.925

Vdd (V)

5

4.95

Idd = 5mA

Idd = 40mA

4.9

-25 0 25 50 75 100 125 150

variation

DD

= 12V

IN

Tj(°C)

Figure 7: Typical compressor relay driver RL4 onstate voltage variation versus its current

1.1 Von (V)

1

0.9

0.8

0.7

0.6

0.5

0 1020304050

Tj = -25ºC

Tj = 25ºC

Tj = 85ºC

Ion (mA)

0.7

0.6

0.5

0 50 100 150

Tj = -25ºC

Tj = 25ºC

Tj = 85ºC

Ion (mA)

AIR CONDITIONER APPLICATION CONSIDERATIONS

■ IMMUNITY IMPROVEMENT OF STCC05 AND THE MICROCONTROLLER

Some basic rules can be applied to improve the STCC05 immunity in its application:

- The power ground of VPS should be split from the signal ground of VDD,

- The STCC05 is placed as close as possible of the MCU,

- The supply capacitors would increase the system immunity by being placed closed to the blocks they feed, or putting decoupling capacitors (f.i. C

= CPS = 100nF)

DD

(1) (2) (3)

- Large supply wire on the PCB should be avoided to reduce sensitivity to radiated interferences.

- A decoupling capacitor can be put on the pin IN (f.i. C

= 10nF; CUP = 100nF).

INS

of the speed sensor interface and the MCU reset pin

S

(4)

Depending of the PCB layout quality, others capacitors may be put on sensitive pins such as the output regulator pin V

and the zero crossing synchronization input pin SYN.

DD

7/13

STCC05-B

Figure 8: Example of PCB layout improvement for higher immunity

2

SMPS

V

PS

3

V

PS

5VREG

V

DD

V

DD

3

Reset

RST\

4

MCU

STCC05

V

SS

COM

1

■ STCC05 ELECTROMAGNETIC COMPATIBILITY

Standards such as IEC61000-4-x evaluate the electromagnetic compatibility of appliance systems. To test the immunity level of the STCC05 to the IEC61000-4-4 (Electrical Fast Transient Bursts), a board representative of usual application control unit should be considered by applying the immunity design rules defined in the previous paragraph. IEC61000-4-4 test does not allow any measurement equipment to be connected to the tested system, as it would corrupt the test results. That is why this board should include a remote monitoring circuit based on optic fibers. Thus, without any electrical link with an oscilloscope, it is possible to monitor the V

DD

voltage as well as the /RST or the ZVS outputs of the STCC05, during the IEC61000-4-4 test. This optical link detects parasitic commutations of outputs as short as 60ns. With this board, and the burst generator coupled to the mains as specified in the IEC61000-4-4 standard (see the following principle diagram), the STCC05 has been tested successfully at 4kV.

Figure 9: IEC61000-4-4 Electrical Fast Transient Burst general STCC05 test circuit

MAINS FILTER

L

PE

N

BURST COUPLER

SYSTEM TESTED

L

PE

N

STCC05

10 cm

8/13

0.5kVto4 kV

tr : 5ns tp : 50 ns

BURST GENERATOR

MAINS

Figure 10: Test circuit schematic

TR1 15V 5VA

MAINS

SPEED SENSOR

RELAY 1

VPS

TR1 15V 5VA

VPS

RELAY 2

Oscilloscope

D1~D4

D1~D4 1N4002

1N4002

Rins

2.2k

RELAY 3

Cins

Cins 10nF

10nF

COMPRESSOR RELAY

Rzv

Czv

Czv 15nF

15nF

15k

Optical Receiver

VPS

Cps_1

Cps_2

Rs

Rs 560

560

Cs

Cps_2 100nF

100nF

HFBR-0410

HFBR-0410 Optic Fiber

Optic Fiber

U1

U1 STCC05-B

STCC05-B

1

Vps

2

SYN

3

INs

4

RL1

5

RL2

6

RL3

7

RL4

8

BZ1

9

BZ2

10 11

ENbz COM

Cps_1 100uF

100uF

BUZZER

47uF

VDD

RST

ZVS

OUTs

IN1

IN2

IN3

IN4

INBZ

OpticalTransmitter

VDD

Cdd_2

Cdd_1

Cdd_2

Cdd_1

100nF

100uF

100nF

100uF

20

19

18

ZVS

17

LS

16

15

14

13

12

SW1

SW2

SW3

SW4

BATTERY

9V5

Cup

Cup 100nF

100nF

VDD

RST

LS

ZVS

TEST BOARD

RST

VDD

■ STCC05 POWER PERFORMANCE VERSUS ITS THERMAL CAPABILITY

STCC05-B

Figure 11: Driver current sum versus regulator current at T

Σ

IM(A)

0.35

0.3

0.25

0.2

T

AMB

0.15

0.1 0 0.01 0.02 0.03 0.04 0.05

= 85°C for VPS = 12, 14, 16, 18V

AMB

=85°C

VPS=18V

VPS=12V

V

=14V

PS

=16V

V

PS

IDD(A)

Figure 12: Driver current sum versus regulator current at T

Σ I

(A)

M

0.35

0.3

0.25

0.2

T

0.15

AMB

0.1 0 0.01 0.02 0.03 0.04 0.05

= 70°C for VPS = 12, 14, 16, 18V

AMB

VPS=12V & 14V

=70°C

=16V

V

PS

VPS=18V

I

(A)

DD

The main heat sources of the circuit during operation are the voltage regulator and the relay coil drivers. Depending of the power supply voltage V of the package R I

. In order to avoid spurious thermal shutdown of the system, it is advised to respect this relationship as

DD

, the sum of all the coil driver currents ΣIM is linked to the output regulator current

th(j-a)

, the ambient temperature T

PS

, and the thermal of resistance

AMB

shown on figures 7 and 8.

■ EXTENSION OF THE REGULATOR CURRENT CAPABILITY

The output current capability of the STCC05 voltage regulator can be increased in a cost effective manner by adding an external ballast transistor and two biasing resistors. With such a circuit, the output voltage regulation remains at 5V 5%, and the current limitation is still active. Such a topology generates also power losses in the external power transistor especially when the supply voltage V with a suitable thermal resistance (R

is high or the regulator is in current limiting mode. Therefore it is advised to use a package

PS

th j-a

). An example is proposed in the following figure doubling the regulator current capability of the solution to 100mA while producing a current limitation typically at 110mA.

Figure 13: Circuit diagram to extend the STCC05 regulator current to 100mA

V

PS

R

E

27Ω ½W

R

B

20 Ω ¼W

Q

BD136

1

STCC05

5V-50mA

Regulator

VDD

Figure 14: Application diagram of the buzzer drive

V

PS

R

=1kΩ

EN

OH

10 kΩ

BZ

V

IN

BZ

IN

RBZ= 1kΩ

R

BZ

= 560 Ω

S

2

C

=47µF

S

1

■ FLOATING BUZZER OPERATION

The sound produced by the buzzer is controlled by the frequency of the square signal applied to the IN

BZ

input pin. The external R

network connected to the BZ2 output pin produces a soft sound by smoothing the

S CS

buzzer supplying envelope at power up and power down. Contrary to basic drivers, which directly apply

9/13

STCC05-B

the voltage to the buzzer, this circuit feeds the buzzer with the exponential voltage induced by the charge and the discharge of the R The R

and RS resistors contribute to reduce high harmonic sound distortions. Indeed, they limit the peak

OH

current through the buzzer, feed the buzzer with the C the low side NPN transistor of the driver. Therefore to set rising/falling durations of the sound shape, it is advised to adjust only the value of the C capacitor. The integrated R

resistor is selected to discharge the buzzer when the low side transistor is off, espe-

BZ

cially at the maximum operating frequency. The buzzer is completely discharged within five times the time constant of the resistor-buzzer with τ = R Therefore, R

< 1 / (10 x F

BZ

maximum operating frequency of driver is 5kHz, this R

S CS

MAX

network.

x C

BUZZER

capacitor voltage, and limit the current through

S

BZ

x C

BUZZER

.

). Since the buzzer capacitance C

resistance is set at 1kΩ.

BZ

BUZZER

is about 20nF at the

S

Figure 15: Buzzer terminal voltages V and buzzer current I

Time : 100µs/div ,V & V : 4V/div , I : 20mA/div

■ ZERO CROSSING DETECTION CIRCUITS

BZ

I

BZ

BZ1 BZ2 BZ

V

BZ1

V

BZ2

BZ1

& V

BZ2

Figure 16: Buzzer terminal voltage V buzzer enable and input circuit signals

V

BZ2

IN

BZ

EN

BZ

Time : 100ms/div ,V , EN & IN : 5V/div

BZ2 BZ BZ

BZ2

with

The detection of the zero crossing of the AC line voltage can be achieved at least on two ways with the STCC05, depending of the power supply unit. When the power supply uses a magnetic 50/60Hz transformer, the input pin SYN is connected to a transformer output through a resistor R

Figure 17: ZVS circuit operation using the AC secondary of a transformer

V

TF

V

SYN

V

ZVS

, the electrical path being closed by the low side bridge diodes.

ZV

The delay between the real Zero Crossing event and the falling edge of ZVS depends on the internal filtering time, the resistance R drop voltage V

, the VPS supply load and the tem-

F

, the rectifier

ZV

perature. The STCC05 contribution to this delay can be evaluated by measuring the delay between its input voltage V

V

AC

When using V

= 20mA, it is about 50 µs on rising voltage V

I

CC

and its output voltage V

TF

= 0.8V, RZV = 15kΩ, VPS = 15V,

F

and 115 µs on falling voltage VTF.

ZVS

TF

When the power supply uses a switch mode power supply, the input pin SYN is synchronized by an

V

DD

25 kW

SYN

R

ZV

15 kΩ

AC

LINE

V

SYN

V

TF

100 kΩ

COM

20µs FILTER

S

1

Q

ZVS

S

2

V

ZVS

opto-coupler, which is connected to the mains terminals through high resistances. The isolator output is on all the time except during the zero crossing where no more current feeds the input and the output transistor switches off.

.

10/13

STCC05-B

Finally, the opto-coupler could be connected directly in high side mode between the SYN and the V

DD

pins: the ZVS signal is then made of high level pulses synchronized with the zero crossing. However, the coupler could be connected in low side mode with an external 10k pull-up resistor to V

: the ZVS is now

DD

inverted with low level pulses.

Figure 18: ZVS circuit operation with an opto-coupler

SYN

COM

V

25 kΩ

100 kΩ

AC

I

OPTO

V

DD

20µs FILTER

S

ZVS

1

Q

S

2

V

ZVS

V

AC

I

OPTO

V

SYN

V

ZVS

V

DD

V

AC

SYN

V

SYN

COM

25 kΩ

100 kΩ

V

DD

20µs FILTER

S

ZVS

1

Q

S

2

V

ZVS

V

SYN

V

ZVS

V

DD

R

UP

10 kΩ

V

AC

V

SYN

Figure 19: Ordering Information Scheme

Circuit configuration and related application

05 = Air conditioner control

Typical power supply voltage

B = 12V

Package

D4 = DIP-20

STCC X - B Z

11/13

STCC05-B

Figure 20: DIP-20 Package Mechanical Data

I

a1

b

Z

20

B

e3

D

e

11

101

L

DIMENSIONS

REF.

Millimetres Inches

Min. Typ. Max. Min. Typ. Max.

a1 0.508 0.020

B 1.39 1.65 0.055 0.065

b 0.45 0.018

b1

F

b1 0.25 0.010

D 25.4 1.000

E

E 8.5 0.335

e 2.54 0.100

e3 22.86 0.900

F 7.1 0.279

I 3.93 0.155

L 3.3 0.130

Z 1.34 0.053

Table 6: Ordering Information

Part Number Marking Package Weight Base qty

STCC05-BD4 STCC05-B DIP-20 1.4 g 20 Tube

Table 7: Revision History

Date Revision Description of Changes

05-Oct-2004 1 First issue

12/13

Delivery

mode

STCC05-B

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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www.st.com

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ST STCC05-B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual