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| 型号： | ISL8107EVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 2 FOR ISL8107 |
| 标准包装： | 1 |
| 系列： | * |
ISL8107
current. The response time is the time required to slew the
inductor current from an initial current value to the transient
0.6
current level. During this interval the difference between the
inductor current and the transient current level must be
supplied by the output capacitor. Minimizing the response
time can minimize the output capacitance required.
The response time to a transient is different for the
application of load and the removal of load. Equation 8 gives
0.5
0.4
0.3
0.5I O
0.25I O
the approximate response time interval for application and
removal of a transient load:
0.2
Δ I = 0I O
t RISE = --------------------------------
t FALL = -------------------------------
L O × I TRAN
V IN – V OUT
L O × I TRAN
V OUT
(EQ. 8)
0.1
0.0
0
0.1
0.2
0.3
0.4 0.5 0.6
0.7
0.8
0.9
1.0
P MOSFET = I O × r DS ( ON ) × D + --- × I O × V IN × T SW × F S
where: I TRAN is the transient load current step, t RISE is the
response time to the application of load, and t FALL is the
response time to the removal of load.
Input Capacitor Selection
Use a mix of input bypass capacitors to control the voltage
overshoot across the MOSFET and the diode. Use small
ceramic capacitors for high frequency decoupling and bulk
capacitors to supply the current needed each time the
MOSFET turns on. Place the small ceramic capacitors
physically close to the MOSFET and the diode, and between
the drain of the MOSFET and the anode of diode.
The important parameters for the bulk input capacitor are the
voltage rating and the RMS current rating. For reliable
operation, select a bulk capacitor with voltage and current
ratings above the maximum input voltage and largest RMS
current required by the circuit. The capacitor voltage rating
should be at least 1.25x greater than the maximum input
voltage, a voltage rating of 1.5x greater is a conservative
guideline. The RMS current rating requirement for the input
capacitor of a buck regulator is approximately as shown in
DUTY CYCLE (D)
FIGURE 14. INPUT-CAPACITOR CURRENT MULTIPLIER FOR
SINGLE-PHASE BUCK CONVERTER
For a through hole design, several electrolytic capacitors
(Panasonic HFQ series or Nichicon PL series or Sanyo
MV-GX or equivalent) may be needed. For surface mount
designs, solid tantalum capacitors can be used, but caution
must be exercised with regard to the capacitor surge current
rating. These capacitors must be capable of handling the
surge-current at power-up. The TPS series available from
AVX, and the 593D series from Sprague are both surge
current tested.
MOSFET Selection/Considerations
The ISL8107 requires a N-Channel power MOSFET. This
should be selected based upon r DS(ON) , gate supply
requirements, and thermal management requirements.
The power dissipation includes two loss components;
conduction loss and switching loss.
2 1
2
Equation 9 .
(EQ. 10)
I O ( D – D 2 ) + -------- D
V O
I IN , RMS =
2 Δ I 2
12
D = ----------
VIN
where: D is the duty cycle = V O / V IN ,
T SW is the switching interval, and
F s is the switching frequency.
OR
I IN , RMS = K ICM ? I O
12
(EQ. 9)
The gate-charge losses are dissipated by the ISL8107 and
don't heat the MOSFETs. However, large gate-charge
increases the switching interval, t SW which increases the
MOSFET switching losses. Ensure that the MOSFET is
within its maximum junction temperature at high ambient
temperature by calculating the temperature rise according to
package thermal-resistance specifications. A separate
heatsink may be necessary depending upon MOSFET
power, package type, ambient temperature and air flow.
Note that at 9V input voltage, the PVCC voltage can be as
low as 6V. Low gate-voltage threshold MOSFET must be
used in this condition.
FN6605.0
October 29, 2008
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