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參數(shù)資料
| 型號： | ISL97516 |
| 廠商： | Intersil Corporation |
| 英文描述： | 600kHz/1.2MHz PWM Step-Up Regulator |
| 中文描述： | 600kHz/1.2MHz PWM升壓調節(jié)器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 318K |
| 代理商： | ISL97516 |
7
FN9261.2
March 16, 2007
Schottky Diode
In selecting the Schottky diode, the reverse break down
voltage, forward current and forward voltage drop must be
considered for optimum converter performance. The diode
must be rated to handle 2.0A, the current limit of the
ISL97516. The breakdown voltage must exceed the
maximum output voltage. Low forward voltage drop, low
leakage current, and fast reverse recovery will help the
converter to achieve the maximum efficiency.
Input Capacitor
The value of the input capacitor depends the input and
output voltages, the maximum output current, the inductor
value and the noise allowed to put back on the input line. For
most applications, a minimum 10μF is required. For
applications that run close to the maximum output current
limit, input capacitor in the range of 22μF to 47μF is
recommended.
The ISL97516 is powered from the VIN. A High frequency
0.1μF bypass cap is recommended to be close to the VIN
pin to reduce supply line noise and ensure stable operation.
Loop Compensation
The ISL97516 incorporates a transconductance amplifier in
its feedback path to allow the user some adjustment on the
transient response and better regulation. The ISL97516
uses current mode control architecture which has a fast
current sense loop and a slow voltage feedback loop. The
fast current feedback loop does not require any
compensation. The slow voltage loop must be compensated
for stable operation. The compensation network is a series
RC network from COMP pin to ground. The resistor sets the
high frequency integrator gain for fast transient response
and the capacitor sets the integrator zero to ensure loop
stability. For most applications, the compensation resistor in
the range of 2k to 7.5k and the compensation capacitor in
the range of 3nF to 10nF.
Soft-Start
The soft-start is provided by an internal 6μA current source
charges the external C
SS
, the peak MOSFET current is
limited by the voltage on the capacitor. This in turn controls
the rising rate of the output voltage. The regulator goes
through the start-up sequence as well after the EN pin is
pulled to HI.
Frequency Selection
The ISL97516 switching frequency can be user selected to
operate at either constant 620kHz or 1.25MHz. Connecting
F
SEL
pin to ground sets the PWM switching frequency to
620kHz. When connecting F
SEL
high or V
DD
, the switching
frequency is set to 1.25MHz.
Shutdown Control
When the EN pin is pulled down, the ISL97516 is shutdown
reducing the supply current to <1μA.
Maximum Output Current
The MOSFET current limit is nominally 2.0A and guaranteed
1.7A. This restricts the maximum output current, I
OMAX
,
based on the following formula:
where:
I
L
= MOSFET current limit
I
L-AVG
= average inductor current
Δ
I
L
= inductor ripple current
V
O
V
DIODE
= Schottky diode forward voltage, typically, 0.6V
F
S
= switching frequency, 600kHz or 1.2MHz
I
D
–
D = MOSFET turn-on ratio:
Table 1 gives typical maximum I
OUT
values for 1.2MHz
switching frequency and 10μH inductor.
Cascaded MOSFET Application
An 25V N-channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 25V, an external cascaded MOSFET is needed
as shown in Figure 12. The voltage rating of the external
MOSFET should be greater than A
VDD
.
TABLE 1.
V
IN
(V)
V
OUT
(V)
I
OMAX
(mA)
2.5
5
870
2.5
9
500
2.5
12
380
3.3
5
1150
3.3
9
655
3.3
12
500
5
9
990
5
12
750
I
L
I
L-AVG
1 2
Δ
I
L
×
(
)
+
=
(EQ. 7)
Δ
I
L
V
V
DIODE
+
(
)
V
S
–
[
]
×
+
------------------------------------------------------------------------------
=
(EQ. 8)
I
L-AVG
-------------
=
(EQ. 9)
D
1
V
+
V
OUT
V
DIODE
--------------------------------------------
–
=
(EQ. 10)
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