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參數(shù)資料
| 型號： | PM6652TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 19/53頁 |
| 文件大?。?/td> | 2519K |
| 代理商： | PM6652TR |
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Device description
PM6652
26/53
Doc ID 16867 Rev 3
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 on page 29 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 on page 29 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 thus calculated as
Equation 3
where
Equation 4
can be set by varying the external resistor ROSC, placed between VIN and VOSC pin. RINT
is the integrated switching frequency programming resistor (typ. 17 k
Ω).
The resultant switching frequency is theoretically independent from battery and output
voltage; actually conduction losses due to MOSFET on resistance, inductor DCR and PCB
traces can slightly influence the programmed value.
τ
+
=
OSC
OUT
OSC
ON
V
K
T
IN
OUT
V
D
=
OSC
OUT
OSC
IN
OUT
ON
SW
K
1
V
K
V
T
D
f
α
τ
+
=
OSC
INT
IN
OSC
R
V
+
=
α
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