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ISL8843MUZ Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL8843MUZ Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 12 page 7 FN9238.0 October 19, 2005 Pin Descriptions RTCT - This is the oscillator timing control pin. The operational frequency and maximum duty cycle are set by connecting a resistor, RT, between VREF and this pin and a timing capacitor, CT, from this pin to GND. The oscillator produces a sawtooth waveform with a programmable frequency range up to 2.0MHz. The charge time, TC, the discharge time, TD, the switching frequency, f, and the maximum duty cycle, Dmax, can be approximated from the following equations: The formulae have increased error at higher frequencies due to propagation delays. Figure 4 may be used as a guideline in selecting the capacitor and resistor values required for a given frequency. COMP - COMP is the output of the error amplifier and the input of the PWM comparator. The control loop frequency compensation network is connected between the COMP and FB pins. FB - The output voltage feedback is connected to the inverting input of the error amplifier through this pin. The non-inverting input of the error amplifier is internally tied to a reference voltage. CS - This is the current sense input to the PWM comparator. The range of the input signal is nominally 0 to 1.0V and has an internal offset of 100mV. GND - GND is the power and small signal reference ground for all functions. Typical Performance Curves FIGURE 1. FREQUENCY vs TEMPERATURE FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE FIGURE 3. EA REFERENCE vs TEMPERATURE FIGURE 4. RTCT vs FREQUENCY -60 -40 -20 0 20 40 60 80 100 120 140 0.98 0.99 1 1.01 TEMPERATURE (°C) -60 -40 -20 0 20 40 60 80 100 0.995 0.996 0.997 0.998 0.999 1.000 1.001 TEMPERATURE (°C) 140 120 -60 -40 -20 0 20 40 60 80 100 120 140 0.996 0.997 0.998 1.000 1.001 TEMPERATURE (°C) 1 10 100 1 10 100 1•103 RT (k Ω) CT = 100pF 220pF 330pF 470pF 1.0nF 2.2nF 3.3nF 4.7nF 6.8nF TC 0.533 RT CT • • ≈ (EQ. 1) TD RT – CT 0.008 RT 3.83 – • 0.008 RT 1.71 – • ---------------------------------------------- ln • • ≈ (EQ. 2) f 1TC TD + () ⁄ = (EQ. 3) DTC f • = (EQ. 4) ISL8843 |
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