akira 14KLS4/CE, Service Manual

Page: 20 / 33

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Model No.: 14KLS4CE
Version: 1.0
TDA16846
TECHNICAL NOTE
Function Remark
PIN 1
Off Time Circuit A parallel RC-circuit between this pin and ground
determines the ringing suppression time and the
standby-frequency.
PIN 2
Primary Current Simulation A capacitor between this pin and ground and a resistor
between this pin and the positive terminal of the primary
elcap quantifies the max. possible output power of the
SMPS.
PIN 3
Regulation and Zero
Crossing Input This is the input of the error amplifier and the zero
crossing input. The output of a voltage divider between
the control winding and ground is connected to this
input. If the pulses at pin 3 exceed a 5 V threshold, the
control voltage at pin 4 is lowered.
PIN 4
Soft-Start and Regulation
Capacitor This is the pin for the control voltage. A capacitor has to
be connected between this pin and ground. The value of
this capacitor determines the duration of the soft start and
the speed of the control.
PIN 5
Op to Coupler Input If an op to coupler for the control is used, it’s output has
to be connected between this pin and ground. The
voltage divider at pin 3 has then to be changed, so that
the pulses at pin 3 are below 5 V.
PIN 6
Fault Comparator 2 Fault comparator 2: If a voltage > 1.2 V is applied to this
pin, the SMPS stops.
PIN 7
Synchronization Input If fixed frequency mode is wanted, a parallel RC circuit
has to be connected between this pin and ground. The
RC-value determines the frequency. If synchronized
mode is wanted, sync pulses have to be fed into this pin.
PIN 8 Not Connected
PIN 9
Reference Voltage and
Current Output for reference voltage (5 V). With a resistor
between this pin and ground the fault comparator 2 (pin
6) is enabled.
PIN 10
Fault Comparator 1 Fault comparator 1: If a voltage > 1 V is applied to this
pin, the SMPS stops.