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參數資料
型號: TPS53851RHHT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩壓器
英文描述: SWITCHING CONTROLLER, PQCC36
封裝: PLASTIC, VQFN-36
文件頁數: 41/66頁
文件大小: 1264K
代理商: TPS53851RHHT
IN
(eqv)
ramp
sw
V × Ac
L
>
DCR
2 × V
× f
(eqv)
R2
DCR
=
× DCR =
R1+ R2
2
R1 +
I
PK
DCReqv
Ac ) VOS )
0.9
V
IN
1 *
0.5
V
IN
20
10*6
+ 22.5 kW
R2 +
I
PK
DCReqv
Ac ) VOS )
0.9
V
IN
0.5
V
IN
20
10*6
+ 510 kW
=
RAMP
OS
V
2 Nph
SLUS985 – DECEMBER 2009
www.ti.com
(39)
(40)
In this design, a 1-
μF capacitor is placed at the CSRT1 pin for the purpose of eliminating noise. It can be
removed without degrading performance.
6.1.5.4
Overcurrent Protection (ILIM1 pin 34)
The resistor selection equations in the CALCULATING OVERCURRENT PROTECTION LEVELsection
are simplified to calculate the over current setting resistors. Set the DC over current rating at 25A.
(41)
(42)
Typical VOS (defined as the internal offset) is calculated in Equation 43.
(43)
where
VRAMP is the ramp amplitude (0.5 V typ)
Nph=6 if PHSEL voltage =1.6 V ±0.2 V, otherwise Nph=8
6.1.5.5
VREG (pin 21)
A 4.7-
μF capacitor is connected to VREG pin to filter noise.
6.1.5.6
BP5 (pin 8)
A 4.7
and 1μF capacitor is placed between VREG and BP5.
6.1.5.7
PHSEL (pin 4)
For this dual output configuration, the PHSEL pin is directly tied to GND. The channel 1 and channel 2 has
a 180° phase shift.
6.1.5.8
VSHARE (pin 6)
A 1
μF capacitor is tied from VSHARE pin to GND.
6.1.5.9
PGOOD1 (pin 30)
The PGOOD1 pin is tied to BP5 with a 10-k
resistor.
6.1.5.10 UVLO_CE1 (pin 29)
It is connected to the input voltage with a resistor divider. The two resistors have the same value of 10-k
.
When the input voltage is higher than 2 V, the chip is enabled.
46
DESIGN EXAMPLES
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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