- 您现在的位置：买卖IC网 > PDF目录69517 > TPS62122DRVT (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, PDSO6 PDF资料下载
参数资料
| 型号： | TPS62122DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO6 |
| 封装： | 2 X 2 MM, GREEN, PLASTIC, SON-6 |
| 文件页数： | 9/33页 |
| 文件大小： | 5549K |
| 代理商： | TPS62122DRVT |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
OUT
ON
IN
V
T
=
1.3 s
V
(
)
IN
OUT
LPFMpeak
ON
V
I
=
T
L
-
www.ti.com
SLVSAD5 – JULY 2010
DETAILED DESCRIPTION
OPERATION
The TPS6212x synchronous step down converter family uses an unique hysteretic PFM/PWM controller scheme
which enables switching frequencies of up to 800kHz, excellent transient response and AC load regulation at
operation with small output capacitors.
At high load currents the converter operates in quasi fixed frequency PWM mode operation and at light loads in
PFM (Pulse Frequency Modulation) mode to maintain highest efficiency over the full load current range. In PFM
Mode, the device generates a single switch pulse to ramp the inductor current and charge the output capacitor,
followed by a sleep period where most of the internal circuits are shutdown to achieve a quiescent current of
typically 10A. During this time, the load current is supported by the output capacitor. The duration of the sleep
period depends on the load current and the inductor peak current.
A significant advantage of TPS6212x compared to other hysteretic controller topologies is its excellent DC and
AC load regulation capability in combination with low output voltage ripple over the entire load range which
makes this part well suited for audio and RF applications.
Main Control Loop
The feedback comparator monitors the voltage on the FB pin and compares it to an internal 800mV reference
voltage.
The feedback comparator trips once the FB voltage falls below the reference voltage. A switching pulse is
initiated and the high-side MOSFET switch is turned on. It remains turned on at least for the minimum On Time
TONmin of typical 700ns until the feedback voltage is above the reference voltage or the inductor current reaches
the high-side MOSFET switch current limit ILIMF. Once the high-side MOSFET switch turns off, the low-side
MOSFET switch is turned on and the inductor current ramps down. It is turned on at least for the minimum Off
Time TOFFmin of typically 60ns. The low-side MOSFET switch stays turned on until the FB voltage falls below the
internal reference and trips the FB comparator again. This will turn on the high-side MOSFET switch for a new
switching cycle.
If the feedback voltage stays above the internal reference the low-side MOSFET switch is turned on until the
zero current comparator trips and indicates that the inductor current has ramped down to zero. In this case, the
load current is much lower than the average inductor current provided during one switching cycle. The regulator
turns the low-side and high-side MOSFET switches off (high impedance state) and enters a sleep cycle with
reduced quiescent current of typically 10uA until the output voltage falls below the internal reference voltage and
the feedback comparator trips again. This is called PFM Mode and the switching frequency depends on the load
current, input voltage, output voltage and the external inductor value.
Once the high-side switch current limit comparator has tripped its threshold of ILIMF, the high-side MOSFET
switch is turned off and the low-side MOSFET switch is turned on until the inductor current has ramped down to
zero.
The minimum On Time TONmin for a single pulse can be estimated to:
(1)
Therefore the peak inductor current in PFM mode is approximately:
(2)
The transition from PFM mode to PWM mode operation and back occurs at a load current of approximately
ILPFMpeak.
With:
TON: high-side MOSFET switch on time [s]
VIN: Input voltage [V]
VOUT: Output voltage [V]
L : Inductance [H]
ILPFMpeak : PFM inductor peak current [mA]
Copyright 2010, Texas Instruments Incorporated
17
相关PDF资料 |
PDF描述 |
|---|---|
| TPS62201DBVTG4 | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
| TPS62201DBVRG4 | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
| TPS62203DBVRG4 | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
| TPS62208DBVT | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
| TPS62203DBVTG4 | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62122DRVT | 制造商:Texas Instruments 功能描述:IC SYNC BUCK DC/DC CONTROLLER 800KHZ 制造商:Texas Instruments 功能描述:IC, SYNC BUCK DC/DC CONTROLLER, 800KHZ, 6-SON |
| TPS62122EVM-586 | 功能描述:电源管理IC开发工具 TPS62122 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS62122EVM-586 | 制造商:Texas Instruments 功能描述:EVAL BOARD, TPS62122, BUCK CONVERTER |
| TPS62125DSGR | 功能描述:开关变换器、稳压器与控制器 3V-17V, 300mA Buck Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS62125DSGT | 功能描述:开关变换器、稳压器与控制器 3V-17V, 300mA Buck Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。