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ICE3B0365J Datasheet(PDF) 9 Page - Infineon Technologies AG |
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ICE3B0365J Datasheet(HTML) 9 Page - Infineon Technologies AG |
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9 / 28 page  CoolSET®-F3R ICE3Bxx65J Version 2.6 9 4 Jul 2011 3.4 PWM Section Figure 6 PWM Section 3.4.1 Oscillator and Jittering The oscillator generates a fixed frequency with frequency jittering of ±4% from the fixed frequency (which is ±2.7kHz from 67kHz) at a jittering period T FJ. The switching frequency is f switch = 67kHz. A resistor, a capacitor and a current source and 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 maximum duty cycle limitation of D max=0.75. Once the Soft Start period is over and when the IC goes into normal mode, the Soft Start capacitor will be charged and discharged through internal current source, I FJ to generate a triangular waveform with a jittering period T FJ which is externally adjustable by the Soft Start capacitor, C SoftS (See Figure 4). T FJ = kFJ * CSoftS where k FJ is a constant = 4 ms/uF eg. T FJ = 4 ms if CSoftS = 1uF 3.4.2 PWM-Latch FF1 The oscillator clock output provides a set pulse to the PWM-Latch when initiating the internal CoolMOS ® conduction. After setting the PWM-Latch can be reset by the PWM comparator, the Soft Start comparator or the Current-Limit comparator. In case of resetting the driver is shut down immediately. 3.4.3 Gate Driver The Gate Driver is a fast totem pole gate drive which is designed to avoid cross conduction currents. The Gate Driver is active low at voltages below the undervoltage lockout threshold V VCCoff. Figure 7 Gate Driver Oscillator Duty Cycle max Gate Driver 0.75 Clock & G9 1 G8 PWM Section FF1 R S Q Gate Soft Start Comparator PWM Comparator Current Limiting Frequency Jitter SoftS VCC 1 PWM-Latch Depl. CoolMOS ™ Gate Driver Gate |
Similar Part No. - ICE3B0365J_11 |
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Similar Description - ICE3B0365J_11 |
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