TDA4605-3 Infineon Technologies, TDA4605-3 Datasheet - Page 9

• Manufacturer Part Number: TDA4605-3
• Description: IC POWER SUPPLY CONTROLLER 8DIP
• Manufacturer: Infineon Technologies

Specifications of TDA4605-3

• Applications: Power Supply Controller
• Voltage - Supply: 7.5 V ~ 15.5 V
• Current - Supply: 11mA
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: SP000011729; TDA46053X; TDA46053XK

Pin 8
The zero detector controlling the logic block recognizes the transformer being discharged by
positive to negative zero crossing of pin 8 voltage and enables the logic for a new pulse. Parasitic
oscillations occurring at the end of a pulse cannot lead to a new pulse (double pulsing), because an
internal circuit inhibits the zero detector for a finite time
Start-Up Behaviour
The start-up behaviour of the application circuit per sheet 88 is represented an sheet 90 for a line
voltage barely above the lower acceptable limit time
The current drawn by the IC in this case is less than 1.6 mA.
If
current draw max. rises to 12 mA. The primary current- voltage reproducer regulates
and the starting impulse generator generates the starting impulses from time point
feedback to pin 8 starts the next impulse and so on. All impulses including the starting impulse are
controlled in width by regulating voltage of pin 1. When switching on this corresponds to a short-
circuit event, i.e.
depending on the regulating voltage feedback (the IC operates in the overload range). The IC
operates at the overload point. Thereafter the peak values of
attempt is aborted (pin 5 is switched to low). As the IC remains switched on,
to
time point
fall below
primary voltage monitor then clamps
up attempt begins at time point
Version 2.0
V
V
–
–
–
6
6
reaches the threshold
. The IC switches off;
V
V
V
6
2
3
corresponding to the half-wave charge current over
to
to the value determined by the divider
V
t
1
V
3A
. If the rectified alternating Iine voltage (primary voltage) collapses during load,
2 max
, as is happening at time point
V
(typically 6.6 V)
1
= 0. Hence the IC starts up with "short-circuit impulses" to assume a width
V
V
6E
6
can rise again (time point
(time point
t
1
.
V
3
to
t
V
1
3S
), the IC switches on the internal reference voltage. The
9
t
until the IC switches off (
3
R
(switch-on attempt when voltage is too low). The
10
/
R
t
0
11
the following voltages built up:
t
UL
.
t
4
) and a new start-up attempt begins at
after the end of each pulse.
R
1
V
2
decrease rapidly, as the starting
V
6
<
V
6A
V
6
). Then a new start-
further decreases
TDA 4605-3
V
2
t
5
down to
1 Jul 2002
to
t
6
V
. The
3
V
can
2B