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参数资料
| 型号： | TPS62306DRC |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3350 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, QFN-10 |
| 文件页数： | 6/25页 |
| 文件大小： | 831K |
| 代理商： | TPS62306DRC |
www.ti.com
PRODUCT
PREVIEW
L = 0.9 mH, CO = 10 mF
500
mV/div
V
O
VI = 3.6 V,
VO = 1.5 V,
IO = 0 mA
t Time 400 ms/div
EN
2
V/div
L = 2.2 mH, CO = 4.7 mF,
1
V/div
V
O
VI = 3.6 V,
VO = 1.6 V,
IO = 320 mA
V
t Time 50 ms/div
EN
2
V/div
(ADJ)
2
V/div
I
200
mA/div
L
DETAILED DESCRIPTION
OPERATION
POWER-SAVE MODE
TPS62300, TPS62301, TPS62302
TPS62303, TPS62304, TPS62305
TPS62306, TPS62320, TPS62321
SLVS528 – JULY 2004
TYPICAL CHARACTERISTICS (continued)
START-UP
POWER DOWN (TPS62321)
Figure 29.
Figure 30.
The TPS6230x and TPS6232x are synchronous step-down converters typically operating with a 3-MHz fixed
frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents, the converter
operates in power-save mode with pulse frequency modulation (PFM). The operating frequency is set to 3 MHz
and can be synchronized on-the-fly to an external oscillator.
During PWM operation, the converter uses a unique fast response, voltage mode, controller scheme with input
voltage feed-forward. This achieves best-in-class load and line response and allows the use of tiny inductors and
small ceramic input and output capacitors. At the beginning of each switching cycle, the P-channel MOSFET
switch is turned on and the inductor current ramps up until the comparator trips and the control logic turns off the
switch.
The device integrates two current limits, one in the P-channel MOSFET and another one in the N-channel
MOSFET. When the current in the P-channel MOSFET reaches its current limit, the P-channel MOSFET is
turned off and the N-channel MOSFET is turned on. When the current in the N-channel MOSFET is above the
N-MOS current limit threshold, the N-channel MOSFET remains on until the current drops below its current limit.
The current limit in the N-channel MOSFET is important for small duty-cycle operation when the current in the
inductor does not decrease because of the P-channel MOSFET current limit delay, or because of start-up
conditions where the output voltage is low.
With decreasing load current, the device automatically switches into pulse skipping operation in which the power
stage operates intermittently based on load demand. By running cycles periodically, the switching losses are
minimized, and the device runs with a minimum quiescent current and maintaining high efficiency.
In power-save mode, the converter only operates when the output voltage trips below a set threshold voltage
(-1.5% VO(NOMINAL)). It ramps up the output voltage with several pulses and goes into power-save mode once the
output voltage exceeds the nominal output voltage. As a consequence, the average output voltage is slightly
lower than its nominal value in the power-save mode operation.
14
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相关代理商/技术参数 |
参数描述 |
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| TPS62311YZDR | 功能描述:直流/直流开关调节器 Adj 500-mA 3-MHz Step-Down Converter 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 |
| TPS62311YZDT | 功能描述:直流/直流开关调节器 Adj 500-mA 3-MHz Step-Down Converter 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 |
| TPS62312YZDR | 制造商:Texas Instruments 功能描述: |
| TPS62313YZDR | 功能描述:直流/直流开关调节器 1.8V 500-mA 3-MHz Step-Down Converter 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 |
| TPS62313YZDT | 功能描述:直流/直流开关调节器 1.8V 500-mA 3-MHz Step-Down Converter 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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