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L5988D Datasheet(PDF) 12 Page - STMicroelectronics |
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L5988D Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 52 page  Functional description L5988D 12/52 DocID15324 Rev 4 5 Functional description The L5988D is based on a voltage mode control loop. Therefore the duty ratio of the internal switch is obtained through a comparison between a saw-tooth waveform (generated by an oscillator) and the output voltage of the error amplifier as shown in Figure 3. The advantage of this technique is the very short conduction time of the power elements thanks to the proper operation of the control loop without a precise current sense, which instead is required in current mode regulators. Thanks to this architecture the L5988D supports extremely low conversion ratio (D = VOUT/VIN) even at very high switching frequency (up to 1 MHz). Figure 3. Voltage mode control loop The main internal blocks are represented in Figure 4. Figure 4. Internal block diagram V REF E/A PWM VOUT OSCILLATOR RAMP V REF E/A PWM VOUT OSCILLATOR RAMP V REF E/A PWM VOUT OSCILLATOR RAMP V REF E/A PWM VOUT OSCILLATOR RAMP |
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