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参数资料
| 型号： | ISL6263CEVAL1 |
| 厂商： | Intersil |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL6263C |
| 标准包装： | 1 |
| 系列： | * |
ISL6263C
Theory of Operation
TABLE 1. VID AND DAC TRUTH TABLE
The R 3 Modulator
The heart of the ISL6263C is Intersil’s Robust-Ripple-
Regulator (R 3 ) Technology?. The R 3 modulator is a hybrid
of fixed frequency PWM control, and variable frequency
hysteretic control that will simultaneously affect the PWM
switching frequency and PWM duty cycle in response to
input voltage and output load transients.
The term “Ripple” in the name “Robust-Ripple-Regulator”
refers to the synthesized voltage-ripple signal V R that
appears across the internal ripple-capacitor C R. The V R
signal is a representation of the output inductor ripple
current. Transconductance amplifiers measuring the input
voltage of the converter and the output set-point voltage
V SOFT , together produce the voltage-ripple signal V R .
A voltage window signal V W is created across the VW and
COMP pins by sourcing a current proportional to g m V SOFT
through a parallel network consisting of resistor R FSET and
capacitor C FSET. The synthesized voltage-ripple signal V R
along with similar companion signals are converted into
PWM pulses.
The PWM frequency is proportional to the difference in
amplitude between V W and V COMP . Operating on these
large-amplitude, low noise synthesized signals allows the
ISL6263C to achieve lower output ripple and lower phase
jitter than either conventional hysteretic or fixed frequency
PWM controllers. Unlike conventional hysteretic converters,
the ISL6263C has an error amplifier that allows the controller
to maintain tight voltage regulation accuracy throughout the
VID range from 0.41200V to 1.28750V.
Voltage Programming
The output voltage V OUT is regulated to the SOFT pin
voltage, V SOFT , which is determined by the DAC output. The
DAC output voltage is programmed by the external five VID
pins. Refer to Table 1 for the VID voltage programming
specification.
Power-On Reset
The ISL6263C is disabled until the voltage at the VDD pin
has increased above the rising VDD power-on reset (POR)
V DD_THR threshold voltage. The controller will become
disabled when the voltage at the VDD pin decreases below
the falling POR V DD_THF threshold voltage.
Start-Up Timing
GPU
MODE
VID4
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
-
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VID2
-
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
-
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VID0
-
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
V SOFT
(DAC) (V)
0
1.28750
1.26175
1.23600
1.21025
1.18450
1.15875
1.13300
1.10725
1.08150
1.05575
1.03000
1.00425
0.97850
0.95275
0.92700
0.90125
0.87550
0.84975
0.82400
0.79825
0.77250
0.74675
0.72100
0.69525
0.66950
0.64375
0.61800
0.59225
0.56650
0.54075
0.51500
0.41200
Figure 4 shows the ISL6263C start-up timing. Once VDD
has ramped above V DD_THR , the controller can be enabled
by pulling the VR_ON pin voltage above the input-high
threshold V VR_ONH . Approximately 100μs later, the soft-start
capacitor C SOFT begins slewing to the designated VID
set-point as it is charged by the soft-start current source I SS .
The V OUT output voltage of the converter follows the V SOFT
voltage ramp to within 10% of the VID set-point then counts
9
13 switching cycles, then changes the open-drain output of
the PGOOD pin to high impedance. During soft-start, the
regulator always operates in continuous conduction mode
(CCM).
FN6745.1
July 8, 2010
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