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參數(shù)資料
| 型號： | ISL658090EVAL3 |
| 廠商： | Intersil Corporation |
| 英文描述： | Integrated Power Stage |
| 中文描述： | 集成功率級 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 1391K |
| 代理商： | ISL658090EVAL3 |
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converter is shut down until OUT_EN or power to the
ISL6590 is cycled. The threshold has hysteresis to eliminate
oscillation. When V
CC
is low (below 7V), a bit in the status
register is set high. As V
CC
rises from a low value to above
9.1V (nominal) the status bit is set to 0 and a hysteresis
switch sets the IUVP threshold to 7.6V (nominal). The
converter will operate until V
CC
falls below 7.6V (see the
ISL6580 data sheet for complete specs). The thresholds are
referenced to V
DD
(3.3V) and vary in proportion to V
DD
.
Power On Reset
The ISL6590 controller performs a Power On Reset function
internally. It holds all internal logic in a reset state until V
DD
(3.3V) exceeds a threshold. While in the reset state all PWM
and NDRIVE signals are held at ground and all MOSFETs
are OFF.
Duty Cycle Limit
The ISL6590 limits the on time of the upper FETs. The
system designer can set the maximum ON time with the user
interface software. The value is entered as a percentage. If
the duty cycle reaches this percentage, the top side FET
turns off until the next cycle.
Component Selection and System
Flexibility
Inductor Selection System Effects
There are three major system impacts that the phase
inductance value impacts. These are transient response,
size, and efficiency.
TRANSIENT RESPONSE
Selection of higher phase switching frequency enables
selection of lower inductance values because peak current
limit protection will not be tripped with the shorter on time.
Lower inductance values can yield higher di/dt slopes to the
load in the ATR (Active Transient Response) mode of
operation in a multiphase system. ATR forces all phases to
an ON state at a given point in time producing the following
di/dt through the power stage.
This di/dt is the power stage current slope capability not the
overall system di/dt which is dependent on many other
factors including output capacitance and parasitics.
SIZE
In general lower inductance values yield smaller designs for
a given current level.
EFFICIENCY
The output inductor can be a significant contributor to
system loss. The inductance value will force a trade for
system efficiency vs. size and transient response. That is,
Physically larger, lower frequency designs will be more
efficient and produce slower transient response in the
system.
These three system criteria must be considered when
selecting or designing the appropriate inductor in a given
application.
Inductance selection
The following formulas apply to this section in selecting the
appropriate inductance for a given application:
F
S
= single phase switching frequency
T
P
= switching period
V
IN
= input voltage
V
OUT
= output voltage
L = inductance
D = duty cycle
T
ON
= on time
T
OFF
= off time
Phases = number of system phases
Saturation Current
The selection process should start with average and peak-
to-peak requirements. At maximum load current the peak
current should be maintained to <25A to stay within ratings.
of the ISL6580.
FIGURE 31. INPUT UNDER VOLTAGE PROTECTION
di
dt
----
---------------------------------------------
=
(EQ. 3)
Ipeak
Iave
0
I
INDUCTOR CURRENT
Higher Inductance
Lower Inductance
Ton
Toff
FIGURE 32. AFFECT OF INDUCTANCE ON PEAK CURRENT
ISL6580
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