參數(shù)資料
型號(hào)： ISL6269CRZ
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Single Phase PWM Controller for Mobile Graphical Processing Unit (GPU)
中文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, PLASTIC, MO-220-VGGC, QFN-16
文件頁(yè)數(shù)： 12/17頁(yè)
文件大?。?/td> 395K
代理商： ISL6269CRZ
12
FN9177.0
June 14, 2005
Undervoltage
When an UVP fault is detected, the ISL6269 undervoltage
protection circuit will pull the PGOOD pin low and latch off
the converter. The UVP fault occurs when the voltage at the
FB pin relative to the GND pin, has fallen below the under-
voltage threshold V
UV.
The fault will remain latched until the
EN pin is pulled below V
ENF
or if the voltage at the VIN is
reduced to the extent that V
CC
has fallen below the POR
V
CCF
threshold.
Over-Temperature
When an OTP fault is detected, the ISL6269 over-
temperature protection circuit suspends PWM, but will not
affect the PGOOD pin, or latch off the converter. The over-
temperature protection circuit measures the temperature of
the silicon and activates when the rising threshold
temperature T
OTR
has been exceeded. The PWM remains
suspended until the silicon temperature falls below the
temperature hysteresis T
OTHYS
at which time normal
operation is resumed. All other protection circuits will
function normally during OTP however, since PWM is
inhibited, it is likely that the converter will immediately
experience an undervoltage fault, latch off, and pull PGOOD
low. If the EN pin is pulled below V
ENF
or if the voltage at the
VIN is reduced to the extent that V
CC
has fallen below the
POR V
CCF
threshold, normal operation will resume
however, the temperature hysteresis T
OTHYS
is reset.
PGOOD
The PGOOD pin connects to three open drain MOSFETS
each of which has a different r
DS(ON)
. Consult the Electrical
Specifications Table for the pull-down resistance of PGOOD
for the corresponding fault. The PGOOD pin is high
impedance whenever V
CC
is below the rising POR threshold
V
OVR
, the falling POR threshold V
OVF
, after delay T
SS
elapses, without an OVP, OCP, SCP, or UVP fault. This fault-
identification capability is a useful tool for trouble-shooting.
Component Selection
Programming the Output Voltage
When the converter is in regulation there will be 600mV from
the FB pin to the GND pin. Connect a two-resistor voltage
divider across the VO pin and the GND pin with the output
node connected to the FB pin. Scale the voltage-divider
network such that the FB pin is 600mV with respect to the
GND pin when the converter is regulating at the desired
output voltage.
Programming the output voltage can be written as:
R
R
TOP
R
BOTTOM
+
Where:
- V
OUT
is the desired output voltage of the converter.
- V
REF
is the voltage that the converter regulates to at the
FB pin.
- R
TOP
is the voltage-programming resistor that connects
from the FB pin to the VO pin. It is usually chosen to set
the gain of the control-loop error amplifier. It follows that
R
BOTTOM
will be calculated based upon the already
selected value of R
TOP.
- R
BOTTOM
is the voltage-programming resistor that
connects from the FB pin to the GND pin.
Calculating the value of R
BOTTOM
can now be written as:
V
R
V
OUT
V
REF
–
Programming the PWM Switching Frequency
The PWM switching frequency F
OSC
is programmed by the
resistor R
FSET
that is connected from the FSET pin to the
GND pin. Programming the approximate PWM switching
frequency can be written as:
×
10
[
]
Estimating the value of R
FSET
can now be written as:
×
10
[
Where:
- F
OSC
is the PWM switching frequency.
- R
FSET
is the F
OSC
programming resistor.
- 60 x [1 x 10
-12
] is a constant.
Selection of the LC Output Filter
The duty cycle of a buck converter is ideally a function of the
input voltage and the output voltage. This relationship can be
written as:
V
V
IN
Where:
- D is the PWM duty cycle.
- V
IN
is the input voltage to be converted.
- V
OUT
is the regulated output voltage of the converter.
The output inductor peak-to-peak ripple current can be
written as:
V
1
D V
–
OSC
O
TABLE 1. PGOOD PULL-DOWN RESISTANCE
CONDITION
PGOOD RESISTANCE
IC Off
Open
Soft Start
95
Undervoltage Fault
95
Overvoltage Fault
60
Overcurrent Fault
30
V
REF
V
OUT
---------------------------------------------------
=
(EQ. 5)
R
BOTTOM
-------------------------------------
=
(EQ. 6)
F
OSC
60 R
FSET
1
-----------------------------------------------------------
=
(EQ. 7)
R
FSET
60 F
OSC
1
]
-------------------------------------------------------
=
(EQ. 8)
D V
IN
)
---------------
=
(EQ. 9)
I
PP
)
[
]
----------------------------------------------------
=
(EQ. 10)
ISL6269
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