參數(shù)資料
型號(hào)： TPS40090RHDRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
封裝： GREEN, PLASTIC, QFN-28
文件頁數(shù)： 4/31頁
文件大小： 881K
代理商： TPS40090RHDRG4
www.ti.com
SETTING THE SWITCHING FREQUENCY
R
RT + KPH
39.2
103
f*1.041
PH
* 7
(7)
F
RPL + NPH
f
PH
(8)
RT - Timing Resistance - k
SWITCHING FREQUENCY
vs
TIMING RESISTANCE
0
10000
100
50
100
150
200
250
300
f S
W
-
Switching
Frequency
-
kHz
SLUS578B – OCTOBER 2003 – REVISED MAY 2006
APPLICATION INFORMATION (continued)
The clock frequency is programmed by the value of the timing resistor connected from the RT pin to ground.
where:
KPH is a coefficient that depends on the number of active phases. For two-phase and three-phase
configurations, KPH= 1.333. For four-phase configurations, KPH= 1. fPH is a single phase frequency, kHz. The
RT resistor value is returned by the last expression in k
.
To calculate the output ripple frequency, use the following equation:
where:
N
PH is a number of phases used in the converter.
The switching frequency of the controller can be synchronized to an external clock applied to the EN/SYNC pin.
The external frequency should be somewhat higher than the free-running clock frequency for synchronization to
take place.
Figure 3.
12
相關(guān)PDF資料
PDF描述
TPS40091RHDR SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
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TPS40091RHDRG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
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