TDA4605 STMicroelectronics, TDA4605 Datasheet - Page 2

• Manufacturer Part Number: TDA4605
• Description: IC POWER SUPPLY CONTROLLER 8DIP
• Manufacturer: STMicroelectronics

Specifications of TDA4605

• Applications: Power Supply Controller
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Voltage - Input: -
• Other names: Q1660517

TDA4605
PIN CONFIGURATION
Figure 2. Block Diagram
2/7
1
Number
Pin
1
2
3
4
5
6
7
8
Regulating voltage : information input concerning secondary voltage.
By comparing the regulating voltage obtained from the regulating winding of the transformer with the
internal reference voltage, the output pulse width on Pin 5 is adapted to the load of the secondary side
(normal, overload, short circuit, no load)
Primary current simulation : information input regarding the primary current. The primary current rise in the
primary winding is simulated at Pin 2 as a voltage rise by means of external RC element. When a value is
reached that is derived from the regulating voltage at Pin 1, the output pulse at Pin 5 is terminated. The RC
element serves to set the maximum power at the overload point.
Primary voltage detector : input for primary voltage monitoring. When the line voltage is too low the IC is
switched-off by comparing V
compensation.
Ground
Output : push-pull output for charge and discharge of the gate capacitance of the power MOS transistor.
Supply voltage : Supply voltage input. From it are derived a stable internal reference voltage (V
switching threshold V
if V
V
Soft-start : input for soft-start and integration network. Start-up will begin with short pulses by connecting a
capacitor between Pin 7 to ground. This capacitor together with a resistor connected between Pin 7 and
error amplifier output also as acts an integrator network for regulation.
Zero detector : Input for the oscillator feedback. After starting oscillator, every zero transit of the feedback
voltage (falling edge) triggers an output pulse at Pin 5. The trigger threshold is at typically - 50mV
6
min < V
6
> V
6E
6
the V
< V
6
REF
max.
is switched on and switched off when V
6A
, V
6E
3
, V
with an internal reference. Voltage at Pin 3 is used for overload point
6
max and V
6
min for the supply voltage detector.
Description
6
< V
6A
. In addition the logic is only enable for
REF
) and the