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参数资料
| 型号： | ISL97519IUZEVALZ |
| 厂商： | Intersil |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ISL97519IUZ |
| 标准包装： | 1 |
| 系列： | * |
ISL97519
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
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 Equation 7:
V IN × [ ( V O + V DIODE ) – V IN ]
Δ I L = ------------------------------------------------------------------------
must be rated to handle 2.0A, the current limit of the
ISL97519. 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 upon 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, an input capacitor in the range of 22μF to 47μF is
recommended.
The ISL97519 is powered from the VIN. A High frequency
I L = I L-AVG + ( 1 ? 2 × Δ I L )
where:
I L = MOSFET current limit
I L-AVG = average inductor current
Δ I L = inductor ripple current
L × ( V O + V DIODE ) × f S
V DIODE = Schottky diode forward voltage, typically, 0.6V
f S = switching frequency, 600kHz or 1.2MHz
(EQ. 7)
(EQ. 8)
V IN
V OUT + V DIODE
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 ISL97519 incorporates a transconductance amplifier in its
feedback path to allow the user some adjustment on the
transient response and better regulation. The ISL97519 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
I OUT
1 – D
I L-AVG = -------------
D = MOSFET turn-on ratio:
D = 1 – ---------------------------------------
Table 1 gives typical maximum I OUT values for 1.2MHz
switching frequency and 10μH inductor.
(EQ. 9)
(EQ. 10)
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 is in the range of 2k to 7.5k and the
compensation capacitor is in the range of 3nF to 10nF.
Soft-Start
The soft-start is provided by an internal 6μA current source,
which 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
V IN (V)
2.5
2.5
2.5
3.3
3.3
3.3
5
5
TABLE 1. MAXIMUM I OUT VALUES
V OUT (V)
5
9
12
5
9
12
9
12
I OMAX (mA)
870
500
380
1150
655
500
990
750
The ISL97519 switching frequency can be user selected to
operate at either constant 620kHz or 1.25MHz. Connecting
FSEL pin to ground sets the PWM switching frequency to
620kHz. When connecting FSEL high or VDD, the switching
frequency is set to 1.25MHz.
Shut-down Control
When the EN pin is pulled down, the ISL97519 is shut down
reducing the supply current to <1μA.
7
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 13. The voltage rating of the external MOSFET should be
greater than A VDD .
FN6454.4
February 16, 2012
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