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ICE2A180 Datasheet(PDF) 11 Page - Infineon Technologies AG |
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ICE2A180 Datasheet(HTML) 11 Page - Infineon Technologies AG |
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11 / 23 page  Datasheet 11 September 2001 CoolSET™-F2 ICE2A165/265/365 ICE2A180/280 Functional Description 3.5.2 Propagation Delay Compensation In case of overcurrent detection by I Limit the shut down of CoolMOS™ is delayed due to the propagation delay of the circuit. This delay causes an overshoot of the peak current I peak which depends on the ratio of dI/dt of the peak current (see Figure 14). . Figure 14 Current Limiting The overshoot of Signal2 is bigger than of Signal1 due to the steeper rising waveform. A propagation delay compensation is integrated to bound the overshoot dependent on dI/dt of the rising primary current. That means the propagation delay time between exceeding the current sense threshold V csth and the switch off of CoolMOS™ is compensated over temperature within a range of at least. So current limiting is now capable in a very accurate way (see Figure 16). Figure 15 Dynamic Voltage Threshold V csth The propagation delay compensation is done by means of a dynamic threshold voltage V csth (see Figure 15). In case of a steeper slope the switch off of the driver is earlier to compensate the delay. E.g. I peak = 0.5A with RSense = 2 . Without propagation delay compensation the current sense threshold is set to a static voltage level V csth=1V. A current ramp of dI/dt = 0.4A/µs, that means dV Sense/dt = 0.8V/µs, and a propagation delay time of i.e. t Propagation Delay =180ns leads then to a I peak overshoot of 12%. By means of propagation delay compensation the overshoot is only about 2% (see Figure 16). Figure 16 Overcurrent Shutdown 3.6 PWM-Latch The oscillator clock output applies a set pulse to the PWM-Latch when initiating CoolMOS™ conduction. After setting the PWM-Latch can be reset by the PWM- OP, the Soft-Start-Comparator, the Current-Limit- Comparator, Comparator C3 or the Error-Latch of the Protection Unit. In case of reseting the driver is shut down immediately. 3.7 Driver The driver-stage drives the gate of the CoolMOS™ and is optimized to minimize EMI and to provide high circuit efficiency. This is done by reducing the switch on slope when reaching the CoolMOS™ threshold. This is achieved by a slope control of the rising edge at the driver’s output (see Figure 17). Thus the leading switch on spike is minimized. When CoolMOS™ 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. At voltages below the undervoltage lockout threshold V VCCoff the gate drive is active low. t I Se n s e I Lim it t P rop ag atio n D e la y I O v ers h oo t1 I pe ak 1 S ign al1 S ig nal2 I O v ers h oo t2 I pe ak 2 dt dV dt dI R Sense peak Sense 1 0 ≤ × ≤ t V csth V OSC Signal1 Signal2 V Sense Propagation Delay max. Duty Cycle off time t 0,9 0,95 1 1,05 1,1 1,15 1,2 1,25 1,3 0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 2 with compensation without compensation dt dV Sense s V µ V |
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