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參數(shù)資料
| 型號： | TPS62305YZD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 500-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER IN CHIP SCALE PACKAGING |
| 中文描述： | 500毫安，3 MHz的同步降壓轉(zhuǎn)換器芯片級封裝 |
| 文件頁數(shù)： | 14/31頁 |
| 文件大小： | 1635K |
| 代理商： | TPS62305YZD |
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www.ti.com
L = 0.9 H, C
O
= 10 F
VO
V
I
= 3.6 V,
V
O
= 1.5 V,
I
O
= 0 mA
t Time 400 s/div
E
L = 2.2 H, C
O
= 4.7 F,
VO
V
I
= 3.6 V,
V
O
= 1.6 V,
I
O
= 320 mA
V
t Time 50 s/div
E
(
I
L
DETAILED DESCRIPTION
OPERATION
The TPS6230x, TPS6231x, 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.
TPS62300, TPS62301, TPS62302
TPS62303, TPS62305, TPS62311
TPS62313, TPS62320, TPS62321
SLVS528B–JULY 2004–REVISED JUNE 2005
TYPICAL CHARACTERISTICS (continued)
START-UP
POWER DOWN (TPS62321)
Figure 29.
Figure 30.
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.
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62305YZDR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62305YZDT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V 500-mA 3MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62311YZDR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62311YZDT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62312YZDR | 制造商:Texas Instruments 功能描述: |
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