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PM6652 데이터시트(PDF) 26 Page - STMicroelectronics

부품명 PM6652
상세설명  Single-phase controller for Intel MVP 6.5 render voltage regulator,
PDF  53 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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PM6652 데이터시트(HTML) 26 Page - STMicroelectronics

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Device description
PM6652
26/53
Doc ID 16867 Rev 5
Equation 1
where KOSC is a constant value (140 ns typ.) and τ is the internal propagation delay (40 ns
typ.).
This leads to a nearly constant switching frequency, regardless of input and output voltages.
When the output voltage goes lower than the internal programmed voltage (see
Section 8.5:
Droop function for details), the on-time one-shot generator directly drives the high-side
MOSFET for a fixed on-time, allowing the inductor current to increase; after the on-time, an
off-time phase, in which the low-side MOSFET is turned on, follows.
If the DPRSLPVR control pin is set low, the low-side MOSFET is turned off only when the
output voltage becomes lower than the programmed value again, and a new cycle begins. In
this working mode the switching frequency is almost load independent, as shown below.
Refer to
Section 8.4: Differential remote sensing section for details about the light load, high-
efficiency algorithm.
The duty cycle of the buck converter, in steady-state conditions, is given by:
Equation 2
The switching frequency is therefore calculated as:
Equation 3
where:
Equation 4
can be set by varying the external resistor ROSC, placed between the VIN and VOSC pin.
RINT is the integrated switching frequency programming resistor (typ. 17 kΩ).
The resulting switching frequency is theoretically independent from battery and output
voltage; actually the conduction losses due to MOSFET ON-resistance, inductor DCR and
PCB traces can slightly influence the programmed value.
τ
+
=
OSC
OUT
OSC
ON
V
V
K
T
IN
OUT
V
V
D
=
OSC
OSC
OSC
OUT
OSC
IN
OUT
ON
SW
K
1
V
V
K
V
V
T
D
f
⋅
α
≅
τ
+
=
=
OSC
INT
INT
IN
OSC
OSC
R
R
R
V
V
+
=
=
α



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