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ISL6842IBZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6842IBZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 FN9124.8 April 16, 2007 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 calculated from Equations 1, 2, 3 and 4: 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 0V to 1.0V and has an internal offset of 100mV. GND - GND is the power and small signal reference ground for all functions. OUT - This is the drive output to the power switching device. It is a high current output capable of driving the gate of a power MOSFET with peak currents of 1.0A. This GATE output is actively held low when VDD is below the UVLO threshold. VDD - VDD is the power connection for the device. The total supply current will depend on the load applied to OUT. Total IDD current is the sum of the operating current and the Typical Performance Curves FIGURE 1. FREQUENCY vs TEMPERATURE FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE FIGURE 3. EA REFERENCE vs TEMPERATURE FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES GIVEN 1.02 1.01 1.00 0.99 0.98 0.97 -40 -10 20 50 80 110 TEMPERATURE (°C) TEMPERATURE (°C) 1.001 1.000 0.999 0.998 0.997 0.996 0.995 -40 -25 -10 5 20 35 50 65 80 95 110 TEMPERATURE (°C) 1.002 1.000 0.998 0.996 0.994 -40 -25 -10 5 20 35 50 65 80 95 110 103 100 10 1 10 20 30 40 50 60 70 80 90 100 RT (k Ω) 100pF 220pF 330pF 470pF 1.0nF 2.2nF 3.3nF 4.7nF t C 0.583 RT CT • • ≈ (EQ. 1) t D RT – CT 0.0083 RT 4.3 – • 0.0083 RT 2.4 – • ---------------------------------------------- ⎝⎠ ⎛⎞ ln • • ≈ (EQ. 2) f 1t C t D + () ⁄ = (EQ. 3) Dt C f • = (EQ. 4) ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 |
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