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参数资料
| 型号： | TC110303ECTRT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 9/13页 |
| 文件大小： | 93K |
| 代理商： | TC110303ECTRT |
5
TC110
PFM/PWM Step-Up DC/DC Controller
TC110-2 5/24/99
2001 Microchip Technology Inc.
DS21355A
VRIPPLE ≈ ESR(di)
where ESR is the equivalent series resistance of the
output filter capacitor, and VRIPPLE is in volts.
Expressing di in terms of switch ON resistance and time:
Solving for L:
Care must be taken to ensure the inductor can handle
peak switching currents, which can be several times load
currents. Exceeding rated peak current will result in core
saturation and loss of inductance. The inductor should be
selected to withstand currents greater than IPK (Equation 10)
without saturating.
Calculating the peak inductor current is straightforward.
Inductor current consists of an AC (sawtooth) current cen-
tered on an average DC current (i.e. input current). Equation
6 calculates the average DC current. Note that minimum
input voltage and maximum load current values should be
used:
Re-writing in terms of input and output currents and
voltages:
Solving for input curent:
The sawtooth current is centered on the DC current
level; swinging equally above and below the DC current
calculated in Equation 6. The peak inductor current is the
sum of the DC current plus half the AC current. Note that
minimum input voltage should be used when calculating the
AC inductor current (Equation 9).
where: VSW = VCESAT of the switch (note if a CMOS
switch is used substitute VCESAT for RDSON x IIN)
Combining the DC current calculated in Equation 6, with
half the peak AC current calculated in Equation 9, the peak
inductor current is given by:
IPK = IIN(MAX) + 0.5(di)
Output Capacitor
The effective series resistance of the output capacitor
directly affects the amplitude of the output voltage ripple.
(The product of the peak inductor current and the ESR
determines output ripple amplitude.) Therefore, a capacitor
with the lowest possible ESR should be selected. Smaller
capacitors are acceptable for light loads or in applications
where ripple is not a concern. The Sprague 959D series of
tantalum capacitors are amongst the smallest of all low ESR
surface mount capacitors available. Table 1 lists suggested
component numbers and manufacturers.
Equation 1.
Equation 2.
Equation 3.
Equation 4.
Equation 5.
Equation 6.
Equation 7.
Equation 8.
Equation 9.
Equation 10.
VRIPPLE ≈
ESR [(VIN – VSW)tON]
L
ESR [(VIN – VSW)tON]
Input Power = Output Power
Efficiency
IIN(MAX) =
(VOUT(MAX))(IOUT(MAX))
(Efficiency)(VIN(MAX))
di =
V(dt)
dt
V = L(di)
dt
(VIN(MIN)) (IN(MAX)) =
(VOUT(MAX))(IOUT(MAX))
Efficiency
di =
[(VIN(MIN) – VSW)tON]
L
≈
VRIPPLE
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相关代理商/技术参数 |
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| TC110303ECTTR | 功能描述:开关变换器、稳压器与控制器 PFM/PWM Step-Up RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TC110331ECT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PFM/PWM Step-Up DC/DC Controller |
| TC110331ECTTR | 功能描述:开关变换器、稳压器与控制器 PFM/PWM Step-Up RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TC110333ECT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PFM/PWM Step-Up DC/DC Controller |
| TC110333ECTTR | 功能描述:开关变换器、稳压器与控制器 PFM/PWM Step-Up RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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