U217B-FP.pdf 데이터시트 (총 14 페이지) - 파일 다운로드 U217B-FP 데이타시트 다운로드

No Preview Available !

TELEFUNKEN Semiconductors
U 217 B / U 217 B–FP
Zero Voltage Switch / Temperature Control for General
Applications
Technology: Bipolar
Features
D Direct supply from the mains
D Current consumption 0.5 mA
D Very few external components
D Full wave drive – no d.c. current component in the load
circuit
D Negative output current pulse typ. 100 mA –
short circuit protected
D Simple power control
D Ramp generator
D Reference voltage
Case: DIP 8, SO 8
Figure 1 Block diagram and pin connections
Preliminary Information
1

No Preview Available !

U 217 B / U 217 B–FP
TELEFUNKEN Semiconductors
Figure 2 Typical circuit — Period group control 0 ... 100 %
General Description
Integrated circuit, U 217 B, is a triac controller for zero
crossing mode. It is meant to control power in switching
resistive loads of mains supply.
Informations regarding supply sync. is provided at Pin 8 via
resistor RSync.
To avoid d.c. load on the mains, full wave logic guarantee
that complete mains cycles are used for load switching.
Fire pulse is released, when the inverted input of the
comparator is negative (Pin 4) with respect to the
non–inverted input (Pin 3) and internal reference voltage.
A ramp generator with free selectable duration is possible
with capacitor C2 at Pin 2, which provides not only
symmetrical pulse burst control (Figure 3) but also control
with superimposed proportional band (Figure 10). Ramp
voltage available at capacitor C2 is decoupled across
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 in such cases 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),
Figure 9.
Figure 3 Pin 1 internal network
2 Preliminary Information

No Preview Available !

TELEFUNKEN Semiconductors
U 217 B / U 217 B–FP
Figure 4
Firing Pulse Width tp, Figure 5
It depends on the latching current of the triac and its load
current. Firing pulse width is determined by the zero
crossing identification which can be influenced with the
help of sync. resistance (Rsync), (Figure 6).
tp =
2
arc. sin
IL x VM
w P Ǹ2
whereas
IL = Latching current of the triac
VM = Mains supply, effective
P = Power load (user’s power)
Total current consumption is influenced by firing pulse
width, which can be calculated as follows:
Rsync =
VM Ǹ2 sin (w x
tp
2 ) – 0.6 V
3.5 x 10 5 A
– 49 kW
Preliminary Information
3

No Preview Available !

U 217 B / U 217 B–FP
TELEFUNKEN Semiconductors
Supply Voltage
The integrated circuit U 217 B which also contains internal
voltage limiting, can be connected via diode (D1 ) and
resistor (R1 ) with the mains supply. An internal climb
circuit limits the voltage between Pin 5 and 7 to a typical
value of 9.25 V.
Series resistance R1 can be calculated (Figures 7 and 8) as
follows:
R1max = 0.85
Vmin – VSmax
2 Itot
; P(R1) =
(VM – VS)2
2 R1
Itot = IS + IP + Ix whereas
VM = Mains voltage
VS = Limiting voltage of the IC
Itot = Total current consumption
IS = Current requirement of the IC (without load)
I = Current requirement of other peripheral components
P(R1) = Power dissipation at R1
Triac Firing Current (Pulse)
It depends on the triac requirement. It can be limited with
gate series resistance, which is calculated as follows:
RGmax 
7.5 V – VGmax
IGmax
– 36 W;
IGmax
IP =
T
x tp
whereas: VG
IGmax
Ip
tp
T
= Gate voltage
= Max. gate current
= Average gate current
= Max. gate current
= Mains period duration
4 Preliminary Information

No Preview Available !

TELEFUNKEN Semiconductors
U 217 B / U 217 B–FP
Absolute Maximum Ratings
Reference point Pin 7
Parameters
Supply current
Sync. current
Output current ramp generator
Input voltages
Power dissipation
Tamb = 45 °C
Tamb = 100 °C
Junction temperature
Operating–ambient temperature range
Storage temperature range
Pin 5
Pin 8
Pin 1
Pin 1, 3, 4, 6
Pin 2
Pin 8
Thermal Resistance
Junction ambient
Parameters
Symbol
–IS
ISync.
IO
–VI
VI
±VI
Ptot
Ptot
Tj
Tamb
Tstg
Symbol
RthJA
Value
30
5
3
VS
2 ... VS
7.3
400
125
125
0 ... 100
–40 ... + 125
Maximum
200
Preliminary Information
Unit
mA
mA
mA
V
V
V
mW
mW
°C
°C
°C
Unit
K/W
5