參數(shù)資料
型號(hào)： P62000NLG
廠(chǎng)商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, QCC64
封裝： ROHS COMPLIANT, QFN-64
文件頁(yè)數(shù)： 36/62頁(yè)
文件大?。?/td> 1221K
代理商： P62000NLG
IDTP62000
2/3/4-PHASE PWM CONTROLLER WITH DYNAMIC VOLTAGE & FREQUENCY SCALING
IDT 2/3/4-PHASE PWM CONTROLLER WITH DYNAMIC VOLTAGE & FREQUENCY SCALING
41
IDTP62000
REV E 050510
CONFIDENTIAL
Phase Current Sensing
Inductor current is sensed by connecting a series resistor and a capacitor network in parallel with the inductor and measuring
the voltage across the capacitor as shown in the following figure. Usually the resistor RCS and capacitor CCS are chosen so
that the time constant of RCS x CCS equals the time constant of the inductor, which is the inductance L divided by the inductor
RDCR. If the two time constants match, the Voltage across CCS is proportional to the current through L, and the sense circuit
can be treated as if it was a sense resistor in series with the inductor. Any mismatch of the time constants does not affect
the measurement of inductor DC current, but affects the AC component of the inductor current.
The IDTP62000 includes a current sense amplifier that uses feedback to inject a current out of each CSNn input pin such
that its voltage is the same as the corresponding CSPn pin. Thus the voltage across the CCS capacitor which represents the
inductor current appears across the RISENSE resistor. The resulting ISENSE current is used to control load balancing, load
line, and other functions that require accurate inductor current information. A fixed IBIAS current that is derived from the IREF
current reference is added to prevent a "dead zone" when inductor current is zero or negative. This bias current is subtracted
prior to subsequent processing by internal circuits. If a noise filter cap is applied from the CSN pin to ground its value should
be 45pF or less to ensure stability of the current sense amplifier.
DCR-based Load Current Sensing (per phase)
The TM temperature sense pin is used to compensate for the 0.385% per degree Centigrade temperature coefficient of
copper inductor windings. An ADC (analog to digital converter) converts the TIM pin voltage into a 6-bit code representing
temperature every 100s. This code is fed to a DAC (digital to analog converter) that creates an offset in the ISENSE current.
The amount of offset is programmable via the SMBus interface. The LSB of the DAC is approximately 2.5°C meaning that
the ISENSE signal is adjusted as temperature varies every 2.5°C.
Overcurrent Threshold and RISENSE Resistor Selection
The hiccup over current threshold is based upon the average ISENSE current generated by all the configured phases and is
programmed by the value of the RISENSE resistors as described by equations 3 and 4.
IOCPAVG = 2.5 x IREF = 49.75 A if RIREF is the recommended 49.9kohm (equation 3)
RISENSE = IOCP x DCR / (49.75A x # of configured phases (equation 4)
For a four phase converter with DCR = 0.8 mohm and a desired overcurrent threshold of 154A;
RISENSE = 154A x 0.8 mohm / (49.75A x 4) = 619 ohms
Vcore
RCS
RDCR
(parasitic)
L
CCS
Vx
VL
IL
VLn
IS
ISENSE
RISENSE
+
-
IBIAS
DRIVER
PWM
IDTP62000
UG
LG
CSP
CSN
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