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ISL68201 Datasheet(PDF) 26 Page - Renesas Technology Corp

Part # ISL68201
Description  Single-Phase R4 Digital Hybrid PWM Controller with PMBus/SMBus/I2C and PFM
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL68201 Datasheet(HTML) 26 Page - Renesas Technology Corp

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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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