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參數(shù)資料
| 型號： | TPS40050QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 8/35頁 |
| 文件大小： | 498K |
| 代理商： | TPS40050QPWPRQ1 |
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TPS40050Q1
TPS40051Q1
TPS40053Q1
SGLS219A NOVEMBER 2003 REVISED MAY 2008
www.ti.com
16
APPLICATION INFORMATION
SYNCHRONIZING TO AN EXTERNAL SUPPLY
The TPS4005x can be synchronized to an external clock through the SYNC pin. The synchronization frequency
should be in the range of 20% to 30% higher than its programmed free-run frequency. The clock frequency at
the SYNC pin replaces the master clock generated by the oscillator circuit. Pulling the SYNC pin low programs
the TPS4005x to freely run at the frequency programmed by RT.
The higher synchronization must be factored in when programming the PWM ramp generator circuit. If the PWM
ramp is interrupted by the SYNC pulse, a UVLO condition is declared and the PWM becomes disabled. Typically
this is of concern under low-line conditions only. In any case, RKFF needs to be adjusted for the higher switching
frequency.
In order to specify the correct value for RKFF at the synchronizing frequency, calculate a ’dummy’ value for RT
that would cause the oscillator to run at the synchronizing frequency. Do not use this value of RT in the design.
R
T(dummy) +
1
f
SYNC
10*6
* 23 kW
Use the value of RT(dummy) to calculate the value for RKFF.
R
KFF + VIN(min) * 3.5 V
58.14
R
T(dummy) ) 1340
k
W
This value of RKFF ensures that UVLO is not engaged when operating at the synchronization frequency.
LOOP COMPENSATION
Voltage-mode buck-type converters are typically compensated using Type III networks. Since the TPS4005x
uses voltage feedforward control, the gain of the PWM modulator with voltage feedforward circuit must be
included. The modulator gain is described in Figure 9, with VIN being the minimum input voltage required to
cause the ramp excursion to cover the entire switching period as described in equation (19).
A
MOD +
V
IN
V
S
or
A
MOD(dB) + 20
log
V
IN
V
S
Duty dycle, D, varies from 0 to 1 as the control voltage, VC, varies from the minimum ramp voltage to the
maximum ramp voltage, VS. Also, for a synchronous buck converter, D = VO / VIN. To get the control voltage
to output voltage modulator gain in terms of the input voltage and ramp voltage,
D
+
V
O
V
IN
+
V
C
V
S
or
V
O
V
C
+
V
IN
V
S
(17)
(18)
(19)
(20)
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPS40051 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) |
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| TPS40051PWP | 功能描述:DC/DC 開關(guān)控制器 WIDE INPUT VOLTAGE SYNC BUCK CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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