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參數(shù)資料
| 型號： | P62000NLG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, QCC64 |
| 封裝： | ROHS COMPLIANT, QFN-64 |
| 文件頁數(shù)： | 13/62頁 |
| 文件大?。?/td> | 1221K |
| 代理商： | P62000NLG |
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IDTP62000
2/3/4-PHASE PWM CONTROLLER WITH DYNAMIC VOLTAGE & FREQUENCY SCALING
IDT 2/3/4-PHASE PWM CONTROLLER WITH DYNAMIC VOLTAGE & FREQUENCY SCALING
20
IDTP62000
REV E 050510
CONFIDENTIAL
Figure 16: Inductor DCR Current Sensing Configuration
Continuous Current Sensing
The IDTP62000 uses a DCR-based load current sensing for each phase. This sensing scheme uses a pole-zero cancellation
technique to allow sensing across the inductor DCR. By doing this, efficiency loss due to an additional sense resistor in the
high current path is avoided. The DCR scheme requires a low pass filter consisting of an external resistor and capacitor to
be placed across the inductor. See Figure 16. The relationship between the sensed current IS and the inductor current IL is
as follows:
(Eq. 1)
When the inductor's L/RDCR time constant is set equal to the CCSRCS time constant the term in the square brackets
becomes a “1” and effectively disappears from the equation.
The internal sense currents for each phase are used for calculating the droop current, the IMON current, the over-current
trip points (average and per phase) and to correct load imbalance among the phases. Furthermore, the average of the
sensed currents is used to determine the threshold for transitioning between DVC offsets or DEC modes.
PWM Function and Current Balance Adjustment
The load balance among different phases in IDTP62000 is achieved by modulating the duty cycle of the PWM pulses of the
corresponding phase. The IDTP62000 uses trailing edge modulation of the internal triangular waveform by the error amplifier
output. The duty cycle of the PWM pulse for a phase is determined by the difference between error signal with the common
mode of that phase's triangular waveform.
Load balancing among the active phases is achieved by controlling the duty cycle of each phase through current mode
feedback loop derived from the sensed current.
IMON Resistor Calculation (R6 in “4-Phase Applications Reference Circuit” diagram)
R6 = 0.9 x (Sum of sensed currents of all configured phases) / 4
Ln
RCS
CSNn
CSPn
UGATEn
LGATEn
PHASEn
CCS
PVCCn
+12V
BOOSTn
Dz
M_upper
M_lower
Rsense
C_boost
VCORE
IS
L
CS
DCR
ISENS
DCR
S
I
R
sC
R
sL
R
I
×
+
×
=
1
/
1
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