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参数资料
| 型号： | TPS65230A2DCA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO48 |
| 封装： | GREEN, HTSSOP-48 |
| 文件页数： | 13/29页 |
| 文件大小： | 1195K |
| 代理商： | TPS65230A2DCA |
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Rc
Cc
Croll
Comp
FB
Vout
R2
R1
Cz
R
=
29
V
R
FB
25
V
-V
OUT
FB
(17)
Other Components
SLVSA10A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009.................................................................................................................................... www.ti.com
The control loop for the TPS6523x has an internal mid- to high-frequency zero-pole pair to compensate the
resonant pole caused by the output L-C filter. The maximum phase boost occurs at the geometric mean of the
pole zero arrangement and therefore aimed to be equal to the desired bandwidth. The pole limits the gain at high
frequencies to reduce noise sensitivity and it is about 5 times higher than the zero located at ~45 kHz.
The COMP pin of the buck converters is the output of an integrator Used to get high DC accuracy. The integrator
also takes care of any offsets in the zero-pole pair amplifier and the summing comparator inside the device. Also
a feed-forward loop is added to the attenuator circuit.
Figure 11. External Compensation Circuit
The procedure to set the integrator values is very simple (see Figure 11):
1. Set the feed-forward circuit making R2 = 20 k
, CZ= 1 nF.
2. Calculate R1 as per output voltage requirement. Select R25 between 10 k
and 100 k. For this design
select 22.1 k
, 0.1% resistor for the upper side of all dividers. Next, R29 Is selected to produce the desired
VFB = 0.8 V and R25 = 22.1 k for VOUT = 5.0 V, R25 = 4.209 k. The closest value 4.22 k.
3. Set the integrator values, RC = 20 k, CC = 1 nF.
4. Make Croll = 100 pf to roll-off gain at high frequencies.
5. If VIN is ~20 - 24 V use 200 pF for Croll on DCDC1.
A 1-
F ceramic capacitor should be connected as close as possible to the following pins:
BG (pin 1): Bandgap reference
VIN (pin 4): Bypass capacitor (higher values are acceptable)
V6V (pin 3): Internal 6 V supply
V3P3 (pin 25): Internal 3.3 V supply
20
Copyright 2009, Texas Instruments Incorporated
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