EVALSF3-ICE3A5565P Infineon Technologies, EVALSF3-ICE3A5565P Datasheet - Page 11

• Manufacturer Part Number: EVALSF3-ICE3A5565P
• Description: BOARD DEMO ICE3A5565P 100W SMPS
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r

Specifications of EVALSF3-ICE3A5565P

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 100W
• Voltage - Output: 18V
• Current - Output: 5.56A
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 100kHz
• Board Type: Fully Populated
• Utilized Ic / Part: ICE3A5565
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: EVALSF3-ICE3A5565PIN

6.8
On the secondary side the power is coupled out by an ultra-fast diode D3. The capacitor C10,C13 and
C15 provide energy buffering followed with the LC filter, L1 and C14 to reduce the output voltage ripple
considerably. Storage capacitor C10, C13 and C15 are selected to have an internal resistance as small
as possible (ESR) to minimize the output voltage ripple.
6.9
The output voltage is sensed by the voltage divider of R9, R10, R8 and R8a and compare to the TL431
internal reference voltage. The output voltage of TL431, IC2 is transferred to the primary via an
optocoupler, IC1 for regulation control. The secondary regulation control is adopted with TL431 and
optocoupler. C11, C12, R5 being the compensation network constitutes the external circuitry of the error
amplifier of TL431. The circuitry allows the feedback to be precisely matched to dynamically varying
load conditions, thereby providing stable control. The maximum current through the optocoupler diode
and the voltage reference is limited by the resistor R6 and R7. Optocoupler IC1 is used for floating
transmission of the control signal to the ‘FB’ input of the ICE3A5565P. Filter capacitor C8 at FB pin of
the IC3A5565P is used to eliminate the noise.
6.10
In case of load jump the controller provides a Blanking Window before activating the Overvoltage
Protection and enters the Auto Restart Mode. The timeframe is generated by charging up the Soft Start
capacitor C5 from 4.4V to 5.4V. Within this timeframe the voltage at Feedback pin can rise up above
4.8V, without switching off. During this operation the transferred power is limited to the maximum peak
current defined by the value of the current sense resistor R3 and R4. The same procedure happens to
the external Soft Start capacitor C5 if a low load condition is detected when V
Only after Vsofts has exceeded 5.4V and V
6.11
At light load condition the SMPS enters into Active Burst Mode. The controller is always active at this
state. Vcc must therefore be above the switch off threshold V
Vout and fast response on load jump, efficiency also increased significantly during Active Burst Mode.
When the voltage level at FB falls below 1.32V, Soft start capacitor C5 at SOFTST pin is allowed to
charge starting from the clamped voltage level at 4.4V in Normal Operating Mode. Active Burst Mode is
entered once V
manipulating C5 is generated to avoid a sudden entering of Burst Mode due to load jump.
During Active Burst Mode the current sense voltage limit at CS ( I
reduce the conduction losses. All the internal circuits are switched off except the reference and bias
voltages to reduce the total V
sawtooth between 3.4 and 4V. To leave Burst Mode, FB voltage must exceed 4.8V as a result of
increase loading. This resets the Active Burst Mode and turns the SMPS into Normal Operating Mode.
Maximum current can now be provided to stabilize V
Application Note
Output Stage
Feedback Loop
Blanking Window for Load Jump / Active Burst Mode
Active Burst Mode
SOFTST
exceeds 5.4V. A Blanking Window as mentioned earlier which can be adjusted by
CC
current consumption to below 1.1mA. The FB voltage is changing like a
FB
100W 18V Demoboard using ICE3A5565P on board
is still below 1.32V, Active Burst Mode is activated.
OUT.
11
ccoff
= 8.5V. While supporting low ripple on
SENSE
) pin, V
FB
CS
is falling below 1.32V.
, is set to 0.257V to
2006-01-13