HIP6301 데이터 시트보기 (PDF) - Intersil
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HIP6301 Datasheet PDF : 17 Pages
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HIP6301
Electrical Specifications Operating Conditions: VCC = 5V, TA = 0°C to 70°C, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
PROTECTION
Overvoltage Threshold
Percent Overvoltage Hysteresis
VSEN Rising
VSEN Falling after Overvoltage
1.12 1.15 1.2 VDAC
-
2
-
%
RIN
FB
ERROR
AMPLIFIER
-
+
CORRECTION
∑
+
-
HIP6303
COMPARATOR
-
+
PWM
CIRCUIT
PROGRAMMABLE
REFERENCE
DAC
+
∑
-
I AVERAGE
-
∑
+
CURRENT
SENSING
CURRENT
AVERAGING
CURRENT
SENSING
-
+
∑
CORRECTION
COMPARATOR
+
PWM
-
CIRCUIT
VIN
PWM1
HIP6601B
Q1
L01
IL1
Q2
PHASE
ISEN1
RISEN1
ISEN2
RISEN2
VIN
PHASE
PWM2
HIP6601B
Q3
L02
IL2
Q4
VCORE
COUT RLOAD
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6301 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR
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.
7
FN4765.6
December 27, 2004
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