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參數(shù)資料
| 型號： | HIP6005B |
| 廠商： | Intersil Corporation |
| 英文描述： | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor |
| 中文描述： | 降壓脈寬調(diào)制（PWM）控制器和輸出電壓監(jiān)視器 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大小： | 151K |
| 代理商： | HIP6005B |
2-115
The over-current function cycles the soft-start function in a
hiccup mode to provide fault protection. A resistor (R
OCSET
)
programs the over-current trip level. An internal 200
μ
A current
sink develops a voltage across R
OCSET
that is referenced to
V
IN
. When the voltage across the upper MOSFET (also
referenced to V
IN
) exceeds the voltage across R
OCSET
, the
over-current function initiates a soft-start sequence. The soft-
start function discharges C
SS
with a 10
μ
A current sink and
inhibits PWM operation. The soft-start function recharges
C
SS
, and PWM operation resumes with the error amplifier
clamped to the SS voltage. Should an overload occur while
recharging C
SS
, the soft start function inhibits PWM operation
while fully charging C
SS
to 4V to complete its cycle. Figure 4
shows this operation with an overload condition. Note that the
inductor current increases to over 15A during the C
SS
charging interval and causes an over-current trip. The
converter dissipates very little power with this method. The
measured input power for the conditions of Figure 4 is 2.5W.
The over-current function will trip at a peak inductor current
(I
PEAK)
determined by:
I
x R
DS ON
)
where I
OCSET
is the internal OCSET current source (200
μ
A
typical). The OC trip point varies mainly due to the
MOSFET’s r
DS(ON)
variations. To avoid over-current tripping
in the normal operating load range, find the R
OCSET
resistor
from the equation above with:
1. Themaximumr
DS(ON)
atthehighestjunctiontemperature.
2. The minimum I
OCSET
from the specification table.
3. Determine I
PEAK
for
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.”
,
A small ceramic capacitor should be placed in parallel with
R
OCSET
to smooth the voltage across R
OCSET
in the
presence of switching noise on the input voltage.
Output Voltage Program
The output voltage of a HIP6005B converter is programmed
to discrete levels between 1.8V
DC
and 3.5V
DC
. 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 32 different combinations of
connections on the VID pins. The output voltage should not
be adjusted while the converter is delivering power. Remove
input power before changing the output voltage. Adjusting
the output voltage during operation could toggle the PGOOD
signal and exercise the overvoltage protection.
‘11111’ VID pin combination resulting in a 0V output setting
activates the Power-On Reset function and disables the gate
drive circuitry. For this specific VID combination, though,
PGOOD asserts a high level. This unusual behavior has been
implemented in order to allow for operation in
dual-microprocessor systems where AND-ing of the PGOOD
signals from two individual power converters is implemented.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to another
can generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. These
interconnecting impedances should be minimized by using
wide, short printed circuit traces. The critical components
should be located as close together as possible using ground
plane construction or single point grounding.
I
PEAK
----------------------------------------------------
=
I
PEAK
I
OUT MAX
)
I
(
)
2
+
>
TABLE 1. OUTPUT VOLTAGE PROGRAM
PIN NAME
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
NOMINAL OUTPUT
VOLTAGE DACOUT
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
PIN NAME
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
NOMINAL OUTPUT
VOLTAGE DACOUT
0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
NOTE: 0 = connected to GND or V
SS
, 1 = connected to V
DD
through pull-up resistors.
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VID4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
HIP6005B
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