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參數(shù)資料
| 型號： | ISL6523 |
| 廠商： | Intersil Corporation |
| 英文描述： | Adjustable Precision Shunt Regulator 3-SOT-23 0 to 70 |
| 中文描述： | VRM8.5雙雙PWM和線性電源系統(tǒng)控制器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 498K |
| 代理商： | ISL6523 |
9
3. Determine I
PEAK
for I
PEAK
> I
OUT(MAX)
+ (
I)/2,
where
I is the output inductor ripple current.
For an equation for the ripple current see the section under
component guidelines titled ‘Output Inductor Selection’.
OUT1 Voltage Program
The output voltage of the PWM1 converter is programmed to
discrete levels between 1.050V and 1.825V. This output
(OUT1) is designed to supply the core voltage of Intel’s
advanced microprocessors. The voltage identification (VID)
pins program an internal voltage reference (DACOUT) with a
TTL-compatible 5-bit digital-to-analog converter (DAC). The
level of DACOUT also sets the PGOOD and OVP thresholds.
Table 1 specifies the DACOUT voltage for the different
combinations of connections on the VID pins. The VID pins
can be left open for a logic 1 input, since they are internally
pulled to the VAUX pin through 5k
resistors. Changing the
VID inputs during operation is not recommended and could
toggle the PGOOD signal and exercise the overvoltage
protection. The output voltage program is Intel VRM8.5
compatible.
Application Guidelines
Soft-Start Interval
Initially, the soft-start function clamps the error amplifier’s output
of the PWM converters. This generates PHASE pulses of
increasing width that charge the output capacitor(s). The
resulting output voltages start-up as shown in Figure 5.
The soft-start function controls the output voltage rate of rise
to limit the current surge at start-up. The soft-start interval
and the surge current are programmed by the soft-start
capacitor, C
SS
. Programming a faster soft-start interval
increases the peak surge current. Using the recommended
0.1
μ
F soft start capacitors ensure all output voltages ramp
up to their set values in a quick and controlled fashion, while
meeting the system timing requirements.
Shutdown
Neither PWM output switches until the soft-start voltage
(V
SS
) exceeds the oscillator’s valley voltage. Additionally, the
reference on each linear’s amplifier is clamped to the soft-
start voltage. Holding the SS24 pin low (with an open drain
or open collector signal) turns off regulators 1, 2 and 3.
Regulator 4 (MCH) will simply drop its output to the
intermediate soft-start level. This output is not allowed to
violate the 2V maximum potential gap to the ATX 3.3V
output.
TABLE 1. OUT1 OUTPUT VOLTAGE PROGRAM
PIN NAME
NOMINAL
DACOUT
VOLTAGE
1.050
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
VID3
0
0
0
0
0
0
0
0
0
0
0
1
1
VID2
1
1
1
0
0
0
0
0
0
0
0
1
1
VID1
0
0
0
1
1
1
1
0
0
0
0
1
1
VID0
0
0
0
1
1
0
0
1
1
0
0
1
1
VID25
0
0
1
0
1
0
1
0
1
0
1
0
1
FIGURE 8. OVERCURRENT DETECTION
OCSET
OVER-
CURRENT
+
-
GATE
CONTROL
VCC
OC
200
μ
A
V
DS
i
D
V
SET
R
OCSET
V
IN
= +5V
OVERCURRENT TRIP:
VDS
I
OCSET
+
+
PWM
DRIVE
VPHASE
VOCSET
VIN
VIN
VDS
VSET
–
=
–
=
UGATE
PHASE
iD
rDS ON
(
)
×
IOCSET
ROCSET
×
>
VSET
>
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
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
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.350
1.375
1.400
1.425
1.450
1.475
1.500
1.525
1.550
1.575
1.600
1.625
1.650
1.675
1.700
1.725
1.750
1.775
1.800
1.825
NOTE: 0 = connected to GND, 1 = open or connected to 3.3V
through pull-up resistors
TABLE 1. OUT1 OUTPUT VOLTAGE PROGRAM (Continued)
PIN NAME
NOMINAL
DACOUT
VOLTAGE
VID3
VID2
VID1
VID0
VID25
ISL6523
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