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| 型号： | TPS622312EVM-574 |
| 厂商： | Texas Instruments |
| 文件页数： | 20/35页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR TPS622312-574 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非绝缘，（3电路） |
| 输出电压： | 1.3V，1.5V，2V |
| 电流 - 输出： | 500mA |
| 输入电压： | 2.05 V ~ 6 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TPS622312，TPS622313，TPS622314 |
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318
SLVS941E – APRIL 2009 – REVISED DECEMBER 2010
DETAILED DESCRIPTION
The TPS6223X synchronous step down converter family includes a unique hysteretic PWM controller scheme
which enables switch frequencies over 3MHz, excellent transient and AC load regulation as well as operation
with cost competitive external components.
The controller topology supports forced PWM Mode as well as Power Save Mode operation. Power Save Mode
operation reduces the quiescent current consumption down to 22 μ A and ensures high conversion efficiency at
light loads by skipping switch pulses. In forced PWM Mode, the device operates on a quasi fixed frequency,
avoids pulse skipping, and allows filtering of the switch noise by external filter components.
The TPS6223X devices offer fixed output voltage options featuring smallest solution size by using only three
external components.
The internal switch current limit of typical 850mA supports output currents of up to 500mA, depending on the
operating condition.
A significant advantage of TPS6223X compared to other hysteretic PWM 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.
OPERATION
Once the output voltage falls below the threshold of the error comparator, a switch pulse is initiated, and the high
side switch is turned on. It remains turned on until a minimum on time of t ONmin expires and the output voltage
trips the threshold of the error comparator or the inductor current reaches the high side switch current limit. Once
the high side switch turns off, the low side switch rectifier is turned on and the inductor current ramps down until
the high side switch turns on again or the inductor current reaches zero.
In forced PWM Mode operation, negative inductor current is allowed to enable continuous conduction mode even
at no load condition.
POWER SAVE MODE
Connecting the MODE pin to GND enables the automatic PWM and power-save mode operation. The converter
operates in quasi fixed frequency PWM mode at moderate to heavy loads and in the PFM (Pulse Frequency
Modulation) mode during light loads, which maintains high efficiency over a wide load current range. In PFM
Mode, the device starts to skip switch pulses and generates only single pulses with an on time of t ONmin . The
PFM Mode frequency depends on the load current and the external inductor and output capacitor values. The
PFM Mode of TPS6223X is optimized for low output voltage ripple if small external components are used. Even
at low output currents, the PFM frequency is above the audible noise spectrum and makes this operation mode
suitable for audio applications.
The on time t ONmin can be estimated to:
t ONmin =
V OUT
V IN
′ 260 ns
(1)
Therefore, the peak inductor current in PFM mode is approximately:
(V IN - V OUT )
I LPFMpeak = ′ t ONmin
L
The transition from PFM into PWM mode and vice versa can be estimated to:
I OUT_PFM/PWM = 0.5 x I LPFMpeak
With
t ON : High side switch on time [ns]
V IN : Input voltage [V]
V OUT : Output voltage [V]
L : Inductance [ μ H]
I LPFMpeak : PFM inductor peak current [mA]
I OUT_PFM/PWM : Output current for PFM to PWM mode transition and vice versa [mA]
(2)
(3)
20
Copyright ? 2009–2010, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS622313DRYR | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622313DRYT | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622314DRYR | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622314DRYT | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622314TDRYRQ1 | 功能描述:直流/直流开关调节器 AC 3MHz,500mA SD Cnvrtr RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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