SP000081008 Infineon Technologies, SP000081008 Datasheet - Page 10

• Manufacturer Part Number: SP000081008
• Manufacturer: Infineon Technologies

Specifications of SP000081008

• Start-up Supply Current: 1mA
• Operating Supply Voltage (min): -0.3V
• Operating Supply Voltage (max): 17V
• Operating Temp Range: -25C to 125C
• Operating Temperature Classification: Commercial
• Package Type: DSO
• Pin Count: 14
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Version 2.0
Fold Back Point Correction PVC (Pin 11)
V
limit of the possible current maximum in the power transistor if the mains voltage
increases. I.e. this limit is independent of the mains (only active in free running mode).
The maximum current (
:
Off-Time Circuit OTC (Pin 1)
Figure 6 shows the Off-Time Circuit which determines the load dependent frequency
curve. When the driver switches off (Figure 7) the capacitor
I
pin 3 reaches the level
I
capacitor’s voltage reaches 3.5 V. The charge time TC1 is
:
For proper operation of the special internal anti- jitter circuit, TC1 (rising time for
should have the same value as the resonance time “tR” of the power circuit (Figure 7).
After charging
resistor
other input of OFTC is the control voltage. The value of the control voltage at the input
of OFTC is limited to a minimum of 2 V (for stable frequency at very light load). The On-
Time Flip Flop (ONTF) is set, if the output of OFTC is high
falls below 25 mV (zero crossing signal is high). This ensures switching on of the power
transistor at minimum voltage. If no zero crossing signal is coming into pin 3, the power
transistor is switched on after an additional delay until
OFTCD). As long as
suppress wrong zero crossings of
after switch-off. The discharge time of
1)
.
Control Voltage
1.5 - 2 V
2 - 3.5 V
3.5 - 5 V
1L
1H
11
i.e.
(approx. 0.5 mA, for extended ringing suppression time). As soon as the voltage at
(approx. 1 mA, for normal ringing suppression time). This current flows until the
is derived from a voltage divider connected to the rectified mains and reduces the
V
1
R
is less than the limited control voltage.
1
. The voltage
C
1
up to 3.5 V the current source is disconnected and
Output Power Off-time TD1
Low
Medium
High
V
1
I
V
Mprimary
V
is higher than the limited control voltage, ONTF is disabled to
3L
1
I
Mprimary
at Pin 1 is applied to the Off-Time Comparator (OFTC). The
(2.5 V), the charging current is switched to the higher value
) depending on the voltage
V
TC1
=
3
Constant (TD1
Decreasing
Free running, switch-on at first minimum
, due to parasitic oscillations from the transformer
----------------------------------------------------------- -
4 V
C
1
is a function of the control voltage.
C
-------------------------
–
10
1
V
1mA
11
L
1,5 V
primary
3
MAX.
V
R
1
2
), const. frequency stand by
falls below 1.5 V (see Figure 6,
V
C
1)
C
11
2
and the voltage
1
at Pin 11 is
is charged first by current
TDA 16846/16846-2
TDA 16847/16847-2
C
1
is discharged by
31 Jul 2003
V
3
I
at Pin 3
1H
only)