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Page Subjects major changes since last revision Datasheet For questions on technology, delivery and prices please contact the Infineon Technologies Offices in Germany or the Infineon Technologies Companies and Representatives worldwide: Infineon Technologies AG The information herein is given to describe certain components and shall not be considered as warranted characteristics.

Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide see address list.

Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system.

If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. Enhanced Protection Functions all with Auto Restart? Lowest Standby Power Dissipation?

In standby mode frequency reduction is used to lower the power consumption and provide a stable output voltage in this mode. In case of failure modes like open loop, overvoltage or overload due to short circuit the device switches in Auto Restart Mode which is controlled by the internal protection unit.

By means of the internal precise peak current limitation the dimension of the transformer and the secondary diode can be lower which leads to more cost efficiency. Isense Current Sense The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the external Power Switch. When Isense reaches the internal threshold of the Current Limit Comparator, the Driver output is disabled.

By this mean the Over Current Detection is realized. The operating range is between 8. To provide overvoltage protection the driver gets disabled when the voltage becomes higher than This is done by comparison the FB signal with the amplified current sense signal.

In case the IC is inactive the current ie is max. To avoid uncontrolled ringing cie switch-on a hysteresis is implemented which means that switch-off is only after active mode when Vcc falls below 8. In case of switch-on a Power Up Reset is done by reseting the internal error-latch in the protection unit.

ICE2AS01-ICE 2AS01 Chip

Thus it oce ensured that at every switch-on the voltage ramp at pin SoftS starts at zero. By means of Current Mode the regulation of the secondary voltage is insensitive on line variations.

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Line variation causes varition of the increasing current slope which controls the duty cycle. 2sa01 external RSense allows an individual adjustment of the maximum source current of the external Power Switch.

Every time the oscillator shuts down for max. When the oscillator triggers the Gate Driver T2 is opened so that the voltage ramp can start see Figure 7. In case of light load the amplified current ramp is to small to ensure a stable regulation. In that case the Voltage Ramp is a well defined signal for the comparison with the FB-signal.

The 22as01 cycle is then controlled by the slope of the Voltage Ramp.

1pc ICE2AS01 Dip-8 Off-line SMPS Controllers Infineon | eBay

By means of the C5 Comparator the Gate Driver is switched-off until the voltage ramp exceeds 0. RSense converts the source current into a sense voltage. The sense voltage is amplified with a gain of 3. The voltage ramp with the superimposed amplified current singal is fed into 2ws01 positive inputs of the Uce, C5 and the Soft-Start-Comparator. VFB is created by an external optocoupler iice external transistor in combination with the internal pullup resistor RFB and provides the load information of the feedback circuitry.

The internal Zener Diode at SoftS with breaktrough voltage of 5. A resistor, a capacitor and a current source 2a01 current sink which determine the frequency are integrated. The charging and discharging current of the implemented oscillator capacitor are internally trimmed, in order to achieve a very accurate switching frequency. The ratio of controlled charge to discharge current is adjusted to reach a max.

There is a cycle by cycle current limiting realised by 2a0s1 Current-Limit Comparator to provide an overcurrent detection. The source current of the external Power Switch is sensed via an external sense resistor RSense. By means ixe RSense the source current is transformed to a sense voltage VSense. When the voltage VSense exceeds the internal threshold voltage Vcsth the Current-Limit-Comparator immediately turns off the gate drive.

To prevent the Current Limiting from distortions caused by leading edge spikes a Leading Edge Blanking is integrated at the Current Sense. Furthermore a Propagation Delay Compensation is added to support the immedeate shut down of the Power Switch in case of overcurrent.

The dependence is shown in Figure This feature allows a power supply to operate at lower frequency at light loads thus lowering the switching losses while maintaining good cross regulation performance and low output ripple.

In case of low power the power consumption of the whole SMPS can now be reduced very effective. During 2ae01 time the output of the Current-Limit Comparator cannot switch off the gate 2ws01. That means the propagation delay time between exceeding the current icee threshold Vcsth and the switch off of the external Power Switch is compensated over temperature within a range of at least. The propagation delay compensation is done by means of a dynamic threshold voltage Vcsth see Figure In case of a steeper slope the switch off of the driver is earlier to compensate the delay.

The lce clock output applies a set pulse to the PWM-Latch when initiating the external Power Switch conduction.


In case of reseting the driver is shut down immediately. Additional thermal shutdown is latched by the Error-Latch. In case of those failure modes the Error-Latch is set after a blanking time of 5? That blanking prevents the Error-Latch from distortions caused by spikes during operation mode. The driver-stage is optimized to minimize EMI and to provide high circuit efficiency. This is done by reducing the switch on slope when reaching the external Power Switch threshold.

When the external Power Switch is switched off, the falling shape of the driver is slowed down when reaching 2V to prevent an overshoot below ground.

Furthermore the driver circuit is designed to eliminate cross conduction of the output stage. These three Version 2. After this phase the comparator C3 can set the Error-Latch in case of open loop or overload which leads the feedback voltage VFB to exceed the threshold of 4.

After latching VCC decreases till 8. In this way the Start Up Phase is not detected as an overload. In case of this failure mode the converter output voltage increases and also VCC.

When VCC exceeds By means of C2 the normal operation mode is prevented from overvoltage detection due to varying of VCC concerning the regulation of the converter output.

When the voltage VSoftS is above 4. All the values which are mentioned in the functional description are typical. Electrical Characteristics Absolute Maximum Ratings Absolute maximum ratings are defined as ratings, which when being exceeded may lead to destruction of the integrated circuit. For the same reason make sure, that any capacitor that will be connected to pin 6 VCC is discharged before assembling the application circuit. Parameter Symbol Limit Values min. Operating Range Within the operating range the IC operates as described in the functional description.

Tj Figure 32 Reduced Osc.

Tj Figure 33 Reduced Osc. Es geht uns also nicht nur um die Produktqualit?

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Unsere Leitlinie ist jede Aufgabe mit? Unternehmensweit orientieren wir uns dabei auch an? Geben Sie uns die Chance, hohe Leistung durch umfassende Qualit? Quality takes on an allencompassing significance at Semiconductor Group.

For us it means living up to each and every one of your demands in the best possible way. So we are not only concerned with product quality. We direct our efforts equally at quality of supply and logistics, service and support, as well as all the other ways in which we advise and attend to you.

Part of this is the very special attitude of our staff. Total Quality in thought and deed, towards co-workers, suppliers and you, our customer.

Throughout the corporation we also think in terms of Time Optimized Processes topgreater speed on our part to give you that decisive competitive edge. Give us the chance to prove the best of performance through the best of quality — you will be convinced.