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参数资料
| 型号： | TPS82678SIP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 6000 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | 2.30 X 2.90 MM, 1 MM HEIGHT, LEAD FREE, USIP-8 |
| 文件页数： | 10/28页 |
| 文件大小： | 943K |
| 代理商： | TPS82678SIP |
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(
)
(
)
m
c
m
B = 2
1 + m
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+
D
SLVSAI0A
– OCTOBER 2010 – REVISED APRIL 2011
The maximum switching frequency is limited by the process and by the parameter modulation ratio (
δ), together
with fm, which is the bandwidth of the side-band harmonics around the carrier frequency fc. The bandwidth of a
frequency modulated waveform is approximately given by the Carson
’s rule and can be summarized as:
(3)
fm < RBW: The receiver is not able to distinguish individual side-band harmonics; so, several harmonics are
added in the input filter and the measured value is higher than expected in theoretical calculations.
fm > RBW: The receiver is able to properly measure each individual side-band harmonic separately, so that the
measurements match the theoretical calculations.
SOFT START
The TPS8267x has an internal soft-start circuit that limits the in-rush current during start-up. This circuit limits
input voltage drop when a battery or a high-impedance power source is connected to the input of the MicroSiP
DC/DC converter.
The soft-start system progressively increases the switching on-time from a minimum pulse-width of 35ns as a
function of the output voltage. This mode of operation continues for approximately 100
μs after the enable. If the
output voltage does not reach its target value within the soft-start time, the soft-start transitions to a second mode
of operation.
If the output voltage rises above approximately 0.5V, the converter increases the input current limit and thus
enables the power supply to come up properly. The start-up time mainly depends on the capacitance present at
the output node and the load current.
ENABLE
The TPS8267x device starts operation when EN is set high and starts up with the soft start as previously
described. For proper operation, the EN pin must be terminated and must not be left floating.
Pulling the EN pin low forces the device into shutdown. In this mode, all internal circuits are turned off and the
VIN current reduces to the device leakage current, which is typically a few hundred nanoamps.
The TPS8267x device can actively discharge the output capacitor when it turns off. The integrated discharge
resistor has a typical resistance of 100
. The required time to ramp down the output voltage depends on the
load current and the capacitance present at the output node.
18
Copyright
2010–2011, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS8267XEVM | 制造商:TI 制造商全称:Texas Instruments 功能描述:The TPS82671 and TPS82675 devices are series of high-frequency, synchronous, step-down dc-dc converters optimized for battery-powered portable applications |
| TPS8268090SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 0.9V 1 Output 1.6A 9-SMD Module 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:0.9V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-SMD 模块 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268105SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 1.05V 1 Output 1.6A 9-SMD Module 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.05V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-SMD 模块 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268120SIPR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 1.6A 9-VBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-VBGA 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268120SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 1.6A 9-VBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-VBGA 供应商器件封装:9-USIP 标准包装:1 |
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