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參數(shù)資料
| 型號(hào)： | XC9101C99AKL |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | PWM Controlled Step-Up DC/DC Controllers |
| 中文描述： | PWM控制升壓型DC / DC控制器 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 311K |
| 代理商： | XC9101C99AKL |
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2. Oscillation Frequency
The oscillation frequency of the internal clock generator is approximated by the following equation according to the values of the capacitor and
resistor attached to the CLK pin. To stablize the IC's operation, set the oscillation frequency within a range of 100kHz to 600kHz. Select a value
for Cclk within a range of 150pF to 220pF and fix the frequency based on the value for Rclk.
f = 1/(-Cclk
×
Rclk
×
ln0.26)
Example: When Cclk = 220 pF and Rclk = 10 k
, f = 1/(-220e
-12
×
10e
3
×
ln(0.26)) = 337.43 kHz.
3. Gain and Frequency Characteristics of the Verr Amplifier
The gain at output and frequency characteristics of the Verr amplifier are adjusted by the values of the capacitor and resistor attached to the
CC/GAIN pin. It is generally recommended to attach a CC of 220 to 1,000 pF without RGAIN. The greater the CC value, the more stable the
phase and the slower the transient response. When using the IC with RGAIN connected, it should be noted that if the RGAIN resistance value
is too high, abnormal oscillation may occur during transient response time. The size of RGAIN should be carefully evaluated before connection.
4. Current Limit
The current limit value is approximated by the following equation according to resistor RSEN inserted between the V
IN
and Isen pins. Double
function, current FB input and current limiting, is assigned to the Isen pin. The current limiting value is approximated by the following equation
according to the value for RSEN.
Ilpeak_limit = 0.15/Rsen
Example: When RSEN = 100 m
, Ilpeak_limit = 0.15/0.1 = 1.5 A
The inside error ampliphier sends feedback signal when the voltage occurs at RSEN resisitors because of the flow of coil current in order to
phase compensate. The more the RSEN value becomes larger, the more the error signal becomes bigger, and it could lead to an intermittent
oscillation. Please be careful if there is a problem with the application. When the regular operation, the voltage which occurs between RSEN
resistors because of coil peak should be set lower than the current limit voltage of 90mV (min.). For more details, please refer the notes on the
external components.
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| XC9101C99AKR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
| XC9101CA0AKL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
| XC9101CA0AKR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
| XC9101CA3AKL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
| XC9101CA3AKR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
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