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BIT3193 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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BIT3193 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 10 page  Beyond Innovation Technology Co., Ltd. BIT3193 04/11/08 Confidential, for authorized user only page 5 of 10 Then the frequency deviation can be calculated as Equation (2) Setting the Frequency of Low Frequency PWM Generator: An internal trimmed low frequency oscillator generates a ± 3% accurate frequency on CTPWM pin with external capacitors. The capacitor values versus operation frequencies are as bellow: Note: Above equation (3) is valid only when operating frequency is between 150Hz ~ 1.5KHz The logic high output of pin PWMOUT is made by an 2.5V DC voltage and the floating state makes the logic low portion. MODSEL pin provides the polarity selection of LF_PWM generator. If MODSEL pin is 0V, a 0% duty cycle is obtained when PWMDC < 1.0V. If this pin is pulled to IC VDD level, 0% duty cycle is obtained while PWMDC> 2.5V. Note: BIT3193 limits the maximum duty cycle to ~ 92 %. PWMOUT sends the pulses when ISEN >1.3V or TIMER >2.5V. UVLO: The under-voltage-lookout circuit turns the output driver off when supply voltage drops too low. Whole system includes the protection and timing circuits are reset (pin TIMER =0) in low VDD state. DC/AC Characteristics: Absolute Ratings: Table 3 Parameter Symbol Ratings Unit Remarks Supply Voltage VDD -0.3~+ 9 V Ground GND ±0.3 V Input pin Voltage -0.3~ VDD+0.3 V Ta=25°C Operating Ambit Temperature Ta 0~ +70 ° C Operating Junction Temperature +150 ° C Storage Temperature -55~+150 ° C DC/AC Characteristics [] ) ...(3 .......... 0.005 C 4512 F CTPWM LFPWM nF + = Fig.6 LOAD Resistor VS. CTOSC Frequency Deviation 26.80 32.10 38.70 45.70 54.40 63.50 76.20 91.40 108.70 126.50 151.10 173.30 0.00 25.00 50.00 75.00 100.00 125.00 150.00 175.00 200.00 0 2040 6080 100 LOAD Resisor (Kohm) CTOSC=100KHz ) ...(2 .......... 100 F100 Fn KHz KHz F n × ∆ = ∆ |
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