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| 型号： | TPS82673SIPT |
| 厂商： | Texas Instruments |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.26V .6A 8USIP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.26V |
| 输入电压： | 2.3 V ~ 4.8 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 5.45MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFBGA |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-uSIP |
| 其它名称： | 296-30408-6 |
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SLVSAI0F – OCTOBER 2010 – REVISED NOVEMBER 2012
The maximum switching frequency is limited by the process and by the parameter modulation ratio ( δ ), together
with f m , which is the bandwidth of the side-band harmonics around the carrier frequency f c . The bandwidth of a
frequency modulated waveform is approximately given by the Carson’s rule and can be summarized as:
B = 2 ′ | m ′ ( 1 + m |
) =2
′
( D | c
+ | m )
(3)
f m < 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.
f m > 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 μ s 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
V IN 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.
Copyright ? 2010–2012, Texas Instruments Incorporated
19
Product Folder Links: TPS82670 TPS82671 TPS82672 TPS82673 TPS82674 TPS82675 TPS82676 TPS82677
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相关代理商/技术参数 |
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|---|---|
| TPS82674 | 制造商:TI 制造商全称:Texas Instruments 功能描述:600-mA, HIGH-EFFICIENCY MicroSiP? STEP-DOWN CONVERTER (PROFILE <1.0mm) |
| TPS826745 | 制造商:TI 制造商全称:Texas Instruments 功能描述:600-mA, HIGH-EFFICIENCY MicroSiP STEP-DOWN CONVERTER (PROFILE <1.0mm) |
| TPS826745SIPR | 制造商:Texas Instruments 功能描述:IC REG BUCK 1.225V .6A 8USIP 制造商:Texas Instruments 功能描述:600mA Fully Int,Low Noise SD Converter |
| TPS826745SIPT | 制造商:Texas Instruments 功能描述:600mA Fully Int,Low Noise SD Converter |
| TPS82674SIP | 制造商:TI 制造商全称:Texas Instruments 功能描述:600-mA, HIGH-EFFICIENCY MicroSiP? STEP-DOWN CONVERTER (PROFILE <1.0mm) |
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