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參數(shù)資料
| 型號： | ISL97645IRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Boost + VON Slice + VCOM |
| 中文描述： | 0.4 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 535K |
| 代理商： | ISL97645IRZ-T |
9
FN9263.0
April 11, 2006
continuous mode (CCM). In continuous current mode,
current flows continuously in the inductor during the entire
switching cycle in steady state operation. The voltage
conversion ratio in continuous current mode is given by:
Where D is the duty cycle of the switching MOSFET.
Figure 11 shows the block diagram of the boost regulator. It
uses a summing amplifier architecture consisting of gm
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 60k
is recommended.
The boost converter output voltage is determined by the
following equation:
The current through the MOSFET is limited to 2.6A
PEAK
.
This restricts the maximum output current (average) based
on the following equation:
Where
I
L
is peak to peak inductor ripple current, and is set
by:
where f
S
is the switching frequency (650kHz or 1.2MHz).
The Table 2 gives typical values (margins are considered
10%, 3%, 20%, 10% and 15% on V
IN
, V
O
, L, f
S
and I
OMAX
).
Capacitor
An input capacitor is used to suppress the voltage ripple
injected into the boost converter. The ceramic capacitor with
capacitance larger than 10μF is recommended. The voltage
rating of input capacitor should be larger than the maximum
input voltage. Some capacitors are recommended in Table 1
for input capacitor.
V
V
IN
------------------
–
1
D
-------------
=
V
Boost
R
--------------------
R
2
+
2
V
FB
×
=
TABLE 1. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
CAPACITOR
SIZE
MFG
PART NUMBER
10μF/16V
1206
TDK
C3216X7R1C106M
10μF/10V
0805
Murata
GRM21BR61A106K
22μF/10V
1210
Murata
GRB32ER61A226K
I
OMAX
I
LMT
I
L
2
--------
–
V
O
---------
×
=
I
L
V
---------
D
f
s
---
×
=
TABLE 2. MAXIMUM OUTPUT CURRENT CALCULATION
V
IN
(V)
V
O
(V)
L (μH)
F
s
(MHz)
I
OMAX
(mA)
3
9
10
0.65
636
3
12
10
0.65
419
3
15
10
0.65
289
5
9
10
0.65
1060
5
12
10
0.65
699
5
15
10
0.65
482
5
18
10
0.65
338
3
9
10
1.2
742
3
12
10
1.2
525
3
15
10
1.2
395
5
9
10
1.2
1236
5
12
10
1.2
875
5
15
10
1.2
658
5
18
10
1.2
514
ISL97645
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| ISL97646IRZ-T | 功能描述:直流/直流開關調(diào)節(jié)器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ISL97646IRZ-TK | 功能描述:直流/直流開關調(diào)節(jié)器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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