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參數(shù)資料
| 型號(hào)： | TPS51120RHBTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A DUAL SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 4/39頁 |
| 文件大?。?/td> | 826K |
| 代理商： | TPS51120RHBTG4 |
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Adaptive On-Time Control
Programming Table
SLUS670B – JULY 2005 – REVISED FEBRUARY 2007
DETAILED DESCRIPTION (continued)
The TPS51120 employs adaptive on time control scheme and does not have a dedicated oscillator on board.
However, it works almost constant frequency over the entire input voltage range (pseudo-constant frequency) by
feed-forwarding the input and output voltage into the on-time one-shot timer. The on-time is controlled inverse
proportional to the input voltage and proportional to the output voltage so that the duty ratio is kept as VOUT/VIN
technically with the same cycle time. The input voltage monitoring is accomplished through sensing the LL node,
not at VIN node, during the ‘ON’ state. This eliminates the influence of the voltage drop across the top MOSFET
to the frequency especially in heavy load condition. The VIN pin is not used for the on-time control but used only
for the 5 V and 3.3 V regulators’ supply. The switching frequency is selectable from four combinations shown in
the table below by setting TONSEL pin voltage. This allows the system design to pursue highest efficiency (5
V/180 kHz, 3.3 V/270 kHz), smallest components size (5 V/380 kHz, 3.3 V/580 kHz) or a good balance of both in
the medium. Also shown in the table are the typical on-time for each frequency and 5 V, 3.3 V outputs at
VIN=12. Output voltage feed-forward is enabled after the output voltage exceeds 1.0 V in order to achieve stable
start up.
Table 1. Frequency Selection and Typical On-Time
TONSEL CONNECTION
CH1(LL1=VIN=12 V)
CH2 (LL2=VIN=12 V)
FREQUENCY (kHz)
ON-TIME @ 5 V (ns)
FREQUENCY (kHz)
ON-TIME @ 3.3 V (ns)
V5FILT
180
2340
270
1030
FLOAT (OPEN)
220
1950
330
850
VREF2
280
1490
430
650
GND
380
1111
580
480
The TPS51120 has varieties of configurations choice. It is important to tailor appropriately with regard to the
system design requirements. Table below shows programming table for the control scheme selection, frequency
selection, output voltage selection and skip selection. Faults-off disables UVP, OVP and UVLO. This is mainly
intended for debugging purpose. Enable states and possible connections for the LDO’s EN3, EN5 pins and
SMPS’s EN1, EN2 pins are also shown.
Table 2. Function Programming Table
PIN
GND
VREF2
FLOAT
V5FILT
COMP
N/A
Current Mode
D-CAP Mode
(apply R-C network)
TONSEL (CH1/CH2) [kHz]
380 / 580
280 / 430
220 / 330
180 / 270
VFB1
Adjustable output (connect to the resistor divider)
5V fixed output
VFB2
Adjustable output (connect to the resistor divider)
3.3 V fixed output
SKIPSEL
AUTO-SKIP
AUTO-SKIP (FAULTS OFF)
PWM
EN1, EN2
Switcher Off
Not used
Switcher on
EN3, EN5
LDO Off
Not used
LDO on
LDO on (EN3 only)
12
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| TPS51123 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual-Synchronous, Step-Down Controller with Out-of-Audio? Operation and 100-mA LDOs for Notebook System Power |
| TPS51123A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual-Synchronous, Step-Down Controller with Out-of-Audioa?￠ Operation and 100-mA LDOs for Notebook System Power |
| TPS51123ARGER | 功能描述:DC/DC 開關(guān)控制器 Dual-Sync,Step- Down 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 |
| TPS51123ARGET | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 DUAL-SYNC,STEP-DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51123EVM-399 | 功能描述:電源管理IC開發(fā)工具 TPS51123EVM-399 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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