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參數(shù)資料
| 型號(hào)： | 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)： | 11/62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
19
IDTP62000
REV E 050510
CONFIDENTIAL
By connecting the DROOP and FB pins together, a current IDROOP which is proportional to the average load current flows
from FB through the feedback resistor RFB to generate the droop voltage. The output voltage is then adjusted by the droop
voltage which is proportional to the load current. The output voltage can be effectively adjusted in the direction to eliminate
spikes or drops or to implement load regulation dependency.
In order to avoid abrupt changes in IDROOP in DEC mode when the number of active phases changes, the IDROOP is defined
as the total current divided by the number of configured phases rather than active phases. This ensures that the load line
will not change when phases are shed.
At light load conditions, a negative inductor current may occur which can cause the current in the current sense amplifier
negative input to fall to zero. This is called the “dead zone” of the load line regulation. The IDTP62000 implements an internal
bias current on each phase IOCDZ that is a scaled-down version of IREF. This bias current is used to shift the current level
up to compensate for negative current during light load operation, which effectively eliminates the dead zone. As shown in
Figure 15, there is no dead zone and the load line resistance RLL is 1 m
Ω.
(Eq.)
Vdroop = Rfb x (DCR / Rsn) x (Iload /n)
where n = # of configured phases
Figure 15: Load Line showing no “Dead Zone”
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