U2008B Datasheet by Microchip Technology

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+$ 41m —z A‘|_mEL®

Features

•Full Wave Current Sensing

•Compensated Mains Supply Variations

•Variable Soft Start or Load-current Sensing

•Voltage and Current Synchronization

•Switchable Automatic Retriggering

•Triggering Pulse Typically 125 mA

•Internal Supply-voltage Monitoring

•Current Requirement £ 3 mA

Applications

•Low-cost Motor Control

•Domestic Appliance

Description

The U2008B is designed as a phase-control circuit in bipolar technology. It enables

load-current detection as well as mains-compensated phase control. Motor control

with load-current feedback and overload protection are preferred applications.

Figure 1. Block Diagram with Typical Circuit: Load Current Sensing

Automatic

retriggering

Limiting

detector

Current

detector

Full wave load

current

Soft start

Voltage

detector

Phase

control unit

Mains voltage

compensation

Supply

voltage

limiting

Reference

voltage

Voltage

monitoring

22 kW/2 W BYT51K

TIC

226

Load

Load current

compensation

Set point

100 nF3.3 nF

230 V ~

GND

V(R6) = ±250 mV

U2008B

amax

22 µF/

25 V

j = f(V3)

330 kW1 MW

R1D1R8

180 W

R6C3C4

R10 100 kW

47 kW

R14

-VS

detector

Low-cost

Phase-control

IC with

Soft Start

U2008B

Rev. 4712A–AUTO–05/03

41m

2U2008B

4712A–AUTO–05/03

Figure 2. Block Diagram with Typical Circuit: Soft Start

Automatic

retriggering

Limiting

detector

Current

detector

Full wave load

current detector

Soft start

Voltage

detector

Phase

control unit

j = f(V3)

Mains voltage

compensation

Supply

voltage

limiting

Reference

voltage

Voltage

monitoring

680 kW

22 kW/2W BYT51K

470 kW

180 W

TIC

226

Load

68 kWSet point

100 nF10 nF

230 V ~

50 kW

220 kW

GND

100 mF/

25 V

Soft start

4.7 mF/25 V

U2008B

R1D1R8

amax

-VS

R10

j KCCK 41m

U2008B

4712A–AUTO–05/03

Pin Configuration

Figure 3. Pinning

Mains Supply, Pin 5,

Figure 2

The integrated circuit U2008B, which also contains voltage limiting, can be connected

via D1 and R1 to the mains supply. Supply voltage, between Pin 4 (pos., ^) and Pin 5, is

smoothed by C1.

The series resistance R1 can be calculated as follows:

where:

Operation with externally stabilized DC voltage is not recommended.

ISENSE

CONTROL

GND

OUTPUT

VSYNC

- VS

U2008B

Pin Description

Pin Symbol Function

1 ISENSE Load current sensing

2CjRamp voltage

3 CONTROL Control input/compensation output

4 GND Ground

5 -VS Supply voltage

6RjRamp current adjustment

7 VSYNC Voltage synchronization

8 OUTPUT Trigger output

VM= Mains voltage

VSmax = Maximum supply voltage

Itot = ISmax + Ix = Total current compensation

ISmax = Maximum current consumption of the IC

Ix= Current consumption of the external components

R1max 0.85 VMVSmax

–

tot

------------------------------

´=

41m

4U2008B

4712A–AUTO–05/03

Voltage Monitoring When the voltage is built up, uncontrolled output pulses are avoided by internal voltage

monitoring. Apart from that, all latches of the circuit (phase control, load limit regulation)

are reset and the soft start capacitor is short circuited. This guarantees a specified start-

up behavior each time the supply voltage is switched on or after short interruptions of

the mains supply. Soft start is initiated after the supply voltage has been built up. This

behavior guarantees a gentle start-up for the motor and automatically ensures the opti-

mum run-up time.

Phase Control, Pin 6 The function of the phase control is identical to that of the well-known IC U211B. The

phase angle of the trigger pulse is derived by comparing the ramp voltage V2 at Pin 2

with the set value on the control input, Pin 3. The slope of the ramp is determined by C3

and its charging current I j.

The charging current can be regulated, changed or altered using R8 at Pin 6. The maxi-

mum phase angle, amax, (minimum current flow angle jmin) can also be adjusted by

using R8 (see Figure 5).

When the potential on Pin 2 reaches the set point level of Pin 3, a trigger pulse is gener-

ated whose pulse width, tp, is determined from the value of C3 (tp = 9 µs/nF, see Figure

7). At the same time, a latch is set with the output pulse, as long as the automatic retrig-

gering has not been activated, then no more pulses can be generated in that half cycle.

Control input at Pin 3 (with respect to Pin 4) has an active range from -9 V to -2 V. When

V3 = -9 V the phase angle is at its maximum amax, i.e., the current flow angle is mini-

mum. The minimum phase angle amin is set with V3 ³ -1 V.

Automatic Retriggering The current-detector circuit monitors the state of the triac after triggering by measuring

the voltage drop at the triac gate. A current flow through the triac is recognized when the

voltage drop exceeds a threshold level of typically 40 mV.

If the triac is quenched within the relevant half wave after triggering (for example owing

to low load currents before or after the zero crossing of current wave, or for commutator

motors, owing to brush lifters), the automatic retriggering circuit ensures immediate

retriggering, if necessary with a high repetition rate, tpp/tp, until the triac remains reliably

triggered.

Current Synchronization,

Pin 8

Current synchronization fulfils two functions:

• Monitoring the current flow after triggering. In case the triac extinguishes again or it

does not switch on, automatic triggering is activated as long as triggering is

successful.

• Avoiding triggering due to inductive load. In the case of inductive load operation, the

current synchronization ensures that in the new half wave no pulse is enabled as

long as there is a current available from the previous half wave, which flows from the

opposite polarity to the actual supply voltage.

A special feature of the IC is the realization of current synchronization. The device eval-

uates the voltage at the pulse output between the gate and reference electrode of the

triac. This results in saving the separate current synchronization input with specified

series resistance.

41m

U2008B

4712A–AUTO–05/03

Voltage Synchronization

with Mains Voltage

Compensation, Pin 7

The voltage detector synchronizes the reference ramp with the mains supply voltage. At

the same time, the mains-dependent input current at Pin 7 is shaped and rectified inter-

nally. This current activates automatic retriggering and at the same time is available at

Pin 3 (see Figure 9). By suitable dimensioning, it is possible to attain the specified com-

pensation effect. Automatic retriggering and mains voltage compensation are not

activated until ½V7 - V4½ increases to 8 V. The resistance Rsync. defines the width of the

zero voltage cross-over pulse, synchronization current, and hence the mains supply

voltage compensation current. If the mains voltage compensation and the automatic

retriggering are not required, both functions can be suppressed by limiting ½V7 - V4½ £ 7

V (see Figure 4).

Figure 4. Suppression of Automatic Retriggering and Mains Voltage Compensation

A further feature of the IC is the selection between soft start and load-current compen-

sation. Soft start is possible by connecting a capacitor between Pin 1 and Pin 4 (see

Figure 8). In the case of load-current compensation, Pin 1 is directly connected with

resistance R6, which is used for sensing load current.

Load Current Detection,

Pin 1

The circuit continuously measures the load current as a voltage drop at resistor R6. The

evaluation and use of both half waves results in a quick reaction to load-current change.

Due to voltage at resistor R6, there is an increase of input current at Pin 1. This current

increase controls the internal current source, whose positive current values are avail-

able at Pin 3 (see Figure 11). The output current generated at Pin 3 contains the

difference from the load-current detection and the mains-voltage compensation (see

Figure 9).

The effective control voltage is the final current at Pin 3 together with the desired value

network. An increase of mains voltage causes an increase of the control angle a. An

increase of load current results in a decrease of the control angle. This avoids a

decrease in revolution by increasing the load as well as an increase of revolution by the

increment of mains supply voltage.

BZX55

C6V2

U2008B

Mains

41m

6U2008B

4712A–AUTO–05/03

Absolute Maximum Ratings

VS = 14 V, reference point Pin 4, unless otherwise specified

Parameters Symbol Value Unit

Current limitation Pin 5

t £ 10 µs

-IS30 mA

-iS100 mA

Synchronous currents Pin 7

t £ 10 µs

±IsyncV

±isyncV

Phase Control Pin 3

Control voltage -VIVS to 0 V

Input current ±II500 mA

Charge current Pin 6 -Ijmax 0.5 mA

Load Current Monitoring/Soft Start, Pin 1

Input current II1mA

Input voltage VI-VS to +2 V

Pulse output

Input voltage Pin 8 +VI

-VI

Storage temperature range Tstg -40 to +125 °C

Junction temperature range Tj-10 to +125 °C

Thermal Resistance

Parameters Symbol Value Unit

Junction ambient

DIP8 RthJA 110 K/W

SO8 on p.c. RthJA 220 K/W

So8 on ceramic RthJA 140 K/W

41m

U2008B

4712A–AUTO–05/03

Electrical Characteristics

Parameters Test Conditions Symbol Min. Typ. Max. Unit

Supply (Pin 5)

Supply-voltage limitation -IS = 3.5 mA

-IS = 30 mA

-VS

14.5

14.6

16.5

16.8

Current requirement Pins 1, 4 and 7 open -IS3.0 mA

Voltage Monitoring (Pin 5)

Turn-on threshold -VTON 11.3 12.3 V

Phase Control

Input current Voltage sync. Pin 7

Current sync. Pin 8

±IsyncV

±IsyncI 3

0.15 2

µA

Voltage limitation ±IL = 2 mA Pin 7 ±VsyncV 8.0 8.5 9.0 V

Reference Ramp (see Figure 5)

Charge current Pin 7 Ij1100µA

Start voltage Pin 2 -Vmax 1.85 1.95 2.05 V

Temperature coefficient of start

voltage Pin 2 -TCR-0.003 %/K

Rj - reference voltage Ij = 10 µA, Pins 6 to 5 VRj0.96 1.02 1.10 V

Temperature coefficient Ij = 10 µA, Pin 6

Ij = 1 µA

TCVRj

0.03

0.06

%/K

Pulse Output (see Figure 6) (Pin 8)

Output-pulse current V8 = -1.2, RGT = 0 WI0100 125 150 mA

Output-pulse width C3 = 3.3 nF, VS = Vlimit tp30 µs

Automatic Retriggering (Pin 8)

Turn-on threshold voltage ±VION 20 60 mV

Repetition rate I7 ³ 150 µA tpp 357.5t

Soft Start (see Figure 8) (Pin 1)

Starting current V1–4 = 8 V I051015µA

Final current V1–4 = -2 V I015 25 40 µA

Discharge current -I00.5 mA

Output current Pin 3 -I00.2 2 mA

Mains Voltage Compensation (see Figure 9)

Current transfer gain I7/I3Pins 7, Pin 3

Pins 1 and 2 open Gi14 17 20

Reverse current V(R6) = V3 = V7 = 0, Pin 3 ±IR2µA

Load-current Detection, V7 = 0 (see Figure 11)

Transfer gain I3/V1G 0.28 0.32 0.37 µA/mV

Offset current V1 = 0, V3 = -8 V, Pin 3 I0036µA

Input voltage Pin 1 -VI300 400 mV

Input offset voltage Pin 1 ±V06mV

8U2008B

4712A–AUTO–05/03

Figure 5. Ramp Control

Figure 6. Pulse Output

Figure 7. Output Pulse Width

100

150

200

250

0 200 400 600 800 1000

Rj(R8) (kW)

Phase Angle a (°)

33 nF 10 nF 6.8 nF 4.7 nF 3.3 nF 2.2 nF

Cj/t = 1.5 nF

0 200 400 600 800

120

(mA)

RGT (W)

1000

100 VGT = -1.2 V

100

200

300

400

0102030

Cj (nF)

(ms)

Dtp/DCj = 9 ms/nF

/ \\r 41m

U2008B

4712A–AUTO–05/03

Figure 8. Option Soft Start

Figure 9. Mains Voltage Compensation

Figure 10. Maximum Resistance of R1

01234

-5

-4

-3

-2

-1

1-4

( V )

t ( s )

4.7 mF

10 mF

C5 = 1 mF

Supply

R1 = 22 kW/2 W

C1 = 100 mF/25 V

-200

-160

-120

-80

-40

-2 -1 0 1 2

I7 (mA)

(mA)

Reference Point

Pin 10

Pins 1

VS = -13 V

02468

100

1max

(kW)

IS (mA)

Max. Series Resistance

VM = 230 V

41m

10 U2008B

4712A–AUTO–05/03

Figure 11. Load-current Detection

Figure 12. Power Dissipation of R1

Figure 13. Power Dissipation of R1 According to Current Consumption

120

160

200

-400 -200 0 200 400

V(R6) (mV)

(mA)

Reference Point

Pin 8

V6 = Ref = V8

VS = -13 V

V15 = V10 = 0 V

010203040

(W)

R1 (kW)

Power Dissipation at Series Resistance R1

0 3 6 9 12 15

IS (mA)

(W)

Power Dissipation at Series Resistance

A1—lnEL

U2008B

4712A–AUTO–05/03

Package Information

Ordering Information

Extended Type Number Package Remarks

U2008B-x DIP8 Tube

U2008B-xFP SO8 Tube

U2008B-xFPG3 SO8 Taped and reeled

9.8

9.5

Package DIP8

Dimensions in mm

1.64

1.44

4.8 max

0.5 min 3.3

0.58

0.48

7.62

2.54

6.4 max

0.36 max

9.8

8.2

7.77

7.47

technical drawings

according to DIN

specifications

technical drawings

according to DIN

specifications

Package SO8

Dimensions in mm 5.00

4.85

0.4

1.27

3.81

1.4

0.25

0.10

5.2

4.8

3.7

3.8

6.15

5.85

0.2

.11_mEL®

Printed on recycled paper.

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U2008B Datasheet by Microchip Technology

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