TDA4605-3 Infineon Technologies, TDA4605-3 Datasheet - Page 10

• 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

TDA 4605-3
Regulation, Overload and No-Load Behaviour
When the IC has started up, it is operating in the regulation range. The potential at pin 1 typically is
V
400 mV. If the output is loaded, the regulation amplifier allows broader impulses (
= H). The peak
5
V
voltage value at pin 2 increases up to
. If the secondary load is further increased, the
2S max
overload amplifier begins to regulate the pulse width downward. This point is referred to as the
V
overload point of the power supply. As the IC-supply voltage
is directly proportional to the
6
secondary voltage, it goes down in accordance with the overload regulation behaviour. If
V
falls
6
below the value
V
, the IC goes into burst operation. As the time constant of the half-wave
6 min
charge-up is relatively large, the short-circuit power remains small. The overload amplifier cuts back
t
to the pulse width
. This pulse width must remain possible, in order to permit the IC to start-up
pk
V
without problems from the virtual short-circuit, which every switching on with
= 0 represents. If
1
V
the secondary side is unloaded, the loading impulses (
= H) become shorter. The frequency
5
increases up to the resonance frequency of the system. If the load is further reduced, the secondary
voltages and
V
increase. When
V
=
V
the logic is blocked. The IC converts to burst
6
6
6 max
operation.This renders the circuit absolutely safe under no-load conditions.
Behaviour when Temperature Exceeds Limit
An integrated temperature protection disables the logic when the chip temperature becomes too
high. The IC automatically interrogates the temperature and starts as soon as the temperature
decreases to permissible values.
Version 2.0
10
1 Jul 2002