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ISL68201 Datasheet(PDF) 26 Page - Renesas Technology Corp |
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ISL68201 Datasheet(HTML) 26 Page - Renesas Technology Corp |
26 / 32 page ISL68201 FN8696 Rev.4.00 Page 26 of 32 Oct 17, 2017 R4 Modulator The R4 modulator is an evolutionary step in R3 technology. Like R3, the R4 modulator is a linear control loop and variable frequency control during load transients to eliminate beat frequency oscillation at the switching frequency and maintains the benefits of current-mode hysteretic controllers. In addition, the R4 modulator reduces regulator output impedance and uses accurate referencing to eliminate the need for a high-gain voltage amplifier in the compensation loop. The result is a topology that can be tuned to voltage-mode hysteretic transient speed while maintaining a linear control model and removes the need for any compensation. This greatly simplifies the regulator design for customers and reduces external component cost. STABILITY The removal of compensation derives from the R4 modulator’s lack of need for high DC gain. In traditional architectures, high DC gain is achieved with an integrator in the voltage loop. The integrator introduces a pole in the open-loop transfer function at low frequencies. That, combined with the double-pole from the output L/C filter, creates a three pole system that must be compensated to maintain stability. Classic control theory requires a single-pole transition through unity gain to ensure a stable system. Current-mode architectures (includes peak, peak-valley, current-mode hysteric, R3, and R4) generate a zero at or near the L/C resonant point, effectively canceling one of the system’s poles. The system still contains two poles, one of which must be canceled with a zero before unity gain crossover to achieve stability. 8Dh[15:0] R TWO READ_TEMP VR Temperature TEMP (°C) = 1/{ln[Rup*HEX2DEC(8D hex data)/(511 - HEX2DEC(8D hex data)/RNTC(at +25°C)]/Beta + 1/298.15} -273.15 98h[7:0] R ONE 02h PMBUS_REVISION Indicates PMBus Revision 1.2 AD[15:0] BLOCK R TWO 8201h IC_DEVICE_ID ISL68201 Device ID AE[15:0] BLOCK R TWO 0003h IC_DEVICE_REVISION ISL68201 Device Revision D0[0:0] R/W ONE PROG2[7:7] ENABLE_PFM PFM OPERATION 0h = PFM Enabled (DCM at light load) 1h = PFM Disabled (always CCM mode) D1[1:0] R/W ONE PROG2[6:5] TEMP_COMP Thermal Compensation: 0h = 30°C; 01h = 15°C; 02h = 5°C; 03h = OFF D2[0:0] R/W ONE PROG3[7:7] ENABLE_ULTRASONIC Ultrasonic PFM Enable 0h = 25kHz Clamp Disabled 1h = 25kHz Clamp Enabled D3[0:0] R/W ONE PROG3[6:6] OCP_BEHAVIOR Set latch or infinite retry for OCP fault: 0h = Retry every 9ms; 01 = Latch-OFF D4[2:0] R/W ONE PROG3[2:0] AV_GAIN R4 AV GAIN (PROG4, AV Gain Multiplier = 2x) 0h = 84; 1h = 73; 2h = 61; 3h = 49 4h = 38; 5h = 26; 6h = 14; 7h = 2 R4 AV GAIN (PROG4, AV Gain Multiplier = 1x) 0h = 42; 1h = 36.5; 2h = 30.5; 3h = 29.5 4h = 19; 5h = 13; 6h = 7; 7h = 1 D5{2:0] R/W ONE PROG4[7:5] RAMP_RATE Soft-Start and Margining DVID Rate (mV/µs) 0h = 1.25; 1h = 2.5; 2h = 5; 3h = 10; 4h = 0.078; 5h = 0.157 6h = 0.315; 7h = 0.625; D6[1:0] R/W ONE PROG4[4:3] SET_RR Set RR 0h = 200k; 01h = 400k; 02h = 600k; 03h = 800k DC[7:0] R ONE READ_PROG1 Read PROG1 DD{7:0] R ONE READ_PROG2 Read PROG2 DE[7:0] R ONE READ_PROG3 Read PROG3 DF[7:0] R ONE READ_PROG4 Read PROG4 NOTE: Serial bus communication is valid 5.5m (typically, worst 6.5ms) after VCC, VIN, 7VLDO, and PVCC above POR. The telemetry update rate is 108µs. TABLE 11. SMBus, PMBus, AND I2C SUPPORTED COMMANDS (Continued) COMMAND CODE ACCESS WORD LENGTH (BYTE) DEFAULT VALUE COMMAND NAME DESCRIPTION |
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