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HIP6301CB-T Datasheet(PDF) 7 Page - Intersil Corporation |
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HIP6301CB-T Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 17 page 7 FN4765.6 December 27, 2004 Operation Figure 1 shows a simplified diagram of the voltage regulation and current control loops. Both voltage and current feedback are used to precisely regulate voltage and tightly control output currents, IL1 and IL2, of the two power channels. The voltage loop comprises the Error Amplifier, Comparators, gate drivers and output MOSFETs. The Error Amplifier is essentially connected as a voltage follower that has as an input, the Programmable Reference DAC and an output that is the CORE voltage. Voltage Loop Feedback from the CORE voltage is applied via resistor RIN to the inverting input of the Error Amplifier. This signal can drive the Error Amplifier output either high or low, depending upon the CORE voltage. Low CORE voltage makes the amplifier output move towards a higher output voltage level. Amplifier output voltage is applied to the positive inputs of the Comparators via the Correction summing networks. Out- of-phase sawtooth signals are applied to the two Comparators inverting inputs. Increasing Error Amplifier voltage results in increased Comparator output duty cycle. This increased duty cycle signal is passed through the PWM CIRCUIT with no phase reversal and on to the HIP6601B, again with no phase reversal for gate drive to the upper MOSFETs, Q1 and Q3. Increased duty cycle or ON time for the MOSFET transistors results in increased output voltage to compensate for the low output voltage sensed. PROTECTION Overvoltage Threshold VSEN Rising 1.12 1.15 1.2 VDAC Percent Overvoltage Hysteresis VSEN Falling after Overvoltage - 2 - % Electrical Specifications Operating Conditions: VCC = 5V, TA = 0°C to 70°C, Unless Otherwise Specified (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS CURRENT SENSING COMPARATOR PWM CIRCUIT + RISEN1 + CORRECTION ERROR AMPLIFIER FB REFERENCE ISEN1 RIN VCORE Q3 Q4 L02 PHASE PWM1 IL2 DAC HIP6303 COUT RLOAD VIN HIP6601B - Q1 Q2 L01 PHASE IL1 VIN HIP6601B CURRENT SENSING COMPARATOR PWM CIRCUIT CORRECTION PWM2 - I AVERAGE + + + - PROGRAMMABLE RISEN2 ISEN2 - - - - + + CURRENT AVERAGING FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6301 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER CHANNEL REGULATOR ∑ ∑ ∑ ∑ HIP6301 HIP6301 |
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