參數(shù)資料
型號(hào): ISL6439AIR
廠商: INTERSIL CORP
元件分類: 穩(wěn)壓器
英文描述: Single Sync Buck PWM Controller for Broadband Gateway Applications
中文描述: SWITCHING CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PQCC16
封裝: 5 X 5 MM, PLASTIC, MO-220VHHB, MLFP-16
文件頁數(shù): 13/15頁
文件大小: 379K
代理商: ISL6439AIR
13
minimize the voltage drop across the bootstrap capacitor
during the on-time of the upper MOSFET. Initial calculations
with V
BOOT2
no less than 4V will quickly help narrow the
bootstrap capacitor range.
For example, consider an upper MOSFET is chosen with a
maximum gate charge, Q
g
, of 100nC. Limiting the voltage
drop across the bootstrap capacitor to 1V results in a value
of no less than 0.1
μ
F. The tolerance of the ceramic capacitor
should also be considered when selecting the final bootstrap
capacitance value.
A fast recovery diode is recommended when selecting a
bootstrap diode to reduce the impact of reverse recovery
charge loss. Otherwise, the recovery charge, Q
RR
, would
have to be added to the gate charge of the MOSFET and
taken into consideration when calculating the minimum
bootstrap capacitance.
ISL6439 DC-DC Converter Application Circuit
Figure 8 shows an application circuit of a DC-DC Converter.
Detailed information on the circuit, including a complete Bill-
of-Materials and circuit board description, can be found in
the ISL6439 Application Note.
Component Selection Notes:
C
3,8,9
- Each
150
μ
F, Panasonic EEF-UE0J151R or Equivalent.
D1 - 30mA Schottky Diode, MA732 or Equivalent
L
1
- 1
μ
H Inductor, Panasonic P/N ETQ-P6F1ROSFA or Equivalent.
Q
1
-
Fairchild MOSFET; ITF86110DK8.
2.5V @ 5A
FB
COMP
UGATE
PHASE
BOOT
GND
LGATE
ISL6439
R
3
R
5
1.07k
C
10
C
11
R
2
L
1
D
1
C
7
C
1
0.1
μ
F
C
4
C
6
1
μ
F
C
8,9
OCSET
CPVOUT
C
3
R
1
Q
1
CT1
CT2
CPGND
VCC
3.3V
C
5
10
μ
F
Ceramic
C
2
C
12
R
4
GND
U
1
GND
14
1
2
3
4
5
8
6
7
9
10
11
12
13
TP
1
TP
3
ENABLE
9.76k
6.49k
2.26k
124
1000pF
0.22
μ
F
0.1
μ
F
33pF
5600pF
8200pF
ENABLE
FIGURE 8. 3.3V to 2.5V 5A DC-DC CONVERTER
ISL6439
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