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PDF ISL6730C Data sheet ( Hoja de datos )
| Número de pieza | ISL6730C | |
| Descripción | Power Factor Correction Controllers | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Power Factor Correction Controllers
ISL6730A, ISL6730B, ISL6730C, ISL6730D
The ISL6730A, ISL6730B, ISL6730C, ISL6730D are active
power factor correction (PFC) controller ICs that use a boost
topology. (ISL6730B, ISL6730C, ISL6730D are Coming Soon.)
The controllers are suitable for AC/DC power systems, up to
2kW and over the universal line input.
The ISL6730A, ISL6730B, ISL6730C, ISL6730D are operated
in continuous current mode. Accurate input current shaping is
achieved with a current error amplifier. A patent pending
breakthrough negative capacitance technology minimizes zero
crossing distortion and reduces the magnetic components
size. The small external components result in a low cost design
without sacrificing performance.
The internally clamped 12.5V gate driver delivers 1.5A peak
current to the external power MOSFET. The ISL6730A,
ISL6730B, ISL6730C, ISL6730D provide a highly reliable
system that is fully protected. Protection features include
cycle-by-cycle overcurrent, over power limit, over-temperature,
input brownout, output overvoltage and undervoltage
protection.
The ISL6730A, ISL6730B provide excellent power efficiency
and transitions into a power saving skip mode during light load
conditions, thus improving efficiency automatically. The
ISL6730A, ISL6730B, ISL6730C, ISL6730D can be shut down
by pulling the FB pin below 0.5V or grounding the BO pin. The
ISL6730C, ISL6730D have no skip mode.
Features
• Reduce component size requirements
- Enables smaller, thinner AC/DC adapters
- Choke and cap size can be reduced by 66%
- Lower cost of materials
• Excellent power factor over line and load regulation
- Internal current compensation
- CCM Mode with Patent pending IP for smaller EMI filter
• Better light load efficiency
- Automatic pulse skipping
- Programmable or automatic shutdown
• High reliable design
- Cycle-by-cycle current limit
- Input average power limit
- OVP and OTP protection
- Input brownout protection
• Small 10 Ld MSOP package
Applications
• Desktop computer AC/DC adaptor
• Laptop computer AC/DC adaptorhttp://www.DataSheet4U.net/
Two switching frequency options are provided. The ISL6730B,
ISL6730D switch at 62kHz, and the ISL6730A, ISL6730C
switch at 124kHz.
• TV AC/DC power supply
• AC/DC brick converters
VLINE
VI
+ VOUT
ISEN
ICOMP
VIN
VCC
GATE
GND
ISL6730 FB
COMP
BO VREG
FIGURE 1. TYPICAL APPLICATION
100
95
90
85
80
75
70
65
60
0
ISL6730A, SKIP
ISL6730C
20 40 60
OUTPUT POWER (W)
FIGURE 2. PFC EFFICIENCY
TABLE 1. KEY DIFFERENCES IN FAMILY OF ISL6730
VERSION
ISL6730A ISL6730B ISL6730C
Switching Frequency
124kHz
62kHz
124kHz
Skip Mode
Yes-Fixed
Yes-Fixed
No
ISL6730D
62kHz
No
80
100
February 26, 2013
FN8258.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Application Schematics (Continued)
Typical 85W Application Schematic
D1
P1
AC1
F1
85~265Vac
P4
AC2
P5
PE
C2
100n
S3KB-TP
R1
L3 2M
7.5m
R3
2M
S3KB-TP
S3KB-TP
S3KB-TP
D3
S3KB-TP
D5
L1 128u
D4
C3
D6 220n
C4
330n
L2 2.2m
C5 C6
470p 470p
D7
S1M-13-F
D8
S1M-13-F
C7
470n
R5
0.22
R8
4.3M
R11
4.3M
2.1k
R9
TP5
R14 C11
6.2k 470p
C10
CR12
47n
U1
TP6 68n 3 ICOMP
2
ISEN
31
D2 C3D04060E
IPA60R600C6
Q1
1
R2
2.2
R4
51k
R6
3.3M
R10
3.3M
2
220n 3.3V
C8 1 DZ1
VCC
VCC
C9 P7
1u
P6
GATE
GND
10
1
C12
100p
TP3
R13
65k
C13
220p
4
VIN
TP4
C14
470n
7
FB
ISL6730A
R18 TP2
R15
DNP
C18
2.2u
68k C15
100n
R16
DNP
R17 C16
1.5k
1n
R19
40k
390V
DC+
TP9
P2
56u
C1
P3
GNDTP10
TP1
P8 PFC_EN
P9
R20
10k
1
Q2
C17 2N7002
1n
5 Page 
ISL6730A, ISL6730B, ISL6730C, ISL6730D
VI
L
Q1
CF1
RCS
RSEN
VOUT
COUT
CURRENT
MIRROR
2:1 ICS
ISEN
ICS > 0.5 IOC
FIGURE 11. INDUCTOR CURRENT SENSING SCHEME
A high value RCS renders more accurate current sensing. It is
recommended to use the RCS to render 120mV peak voltage at
the maximum line voltage during full load condition.
RC
S
>
1----2---0----m-----V------⋅---V----R----M-----S----M-----A----X-----⋅---η--
2 ⋅ POmax
(EQ. 4)
Where η is the efficiency of the converter at the maximum line
input with full load.
Since the RCS sees the average input current, high value RCS
generates high power dissipation on the RCS. Use a reasonable
RCS according to the resistor power rating. The worst-case power
dissipation occurs at the input low line when input current is at
its maximum. Power dissipation by the resistor is:
PRCS = (IRMSMAX)2 ⋅ RCS
(EQ. 5)
where:
IRMSMAX is the maximum input RMS current at the minimum
input line voltage, VRMSmin.
Select the RSEN according to the peak current limit requirement.
The resistor is sized for an overload current 25% more than the
peak inductor peak current.
Negative Input Capacitor Generation
(Patent Pending)
The patent pending negative capacitor generation capability of
the ISL6730A, ISL6730B, ISL6730C, ISL6730D allows the
capacitor CF2 to be moved from before the bridge rectifier
(Figure 12) to after the bridge rectifier (Figure 13). Thus, a
smaller lower cost CF2 can be used. The change in topology
reduces the size of the EMI filter. Furthermore, CF1 can be
increased thus decreasing the size of LF (Figure 13).
EMI CHOKE
LF
BRIDGE RECFIFIER
VLINE
CF3
Lm
CF2
CF1
FIGURE 12. TYPICAL PFC INPUT FILTER CIRCUIT
BRIDGE RECFIFIER
EMI CHOKE
LF
VLINE
CF3
Lm
CF2 CF1
FIGURE 13. LOW COST PFC INPUT FILTER CIRCUIT
For applications where the output power is above 500W, the
negative capacitance helps to improve the power factor
dramatically. Please refer to Table 2 for the recommended
filtering capacitor to be placed after the bridge rectifier, CF1.
TABLE 2.
CF1
Typical
C(µF)/100W
Po < 100W
0.68
100W < Po < 500W Po > 500W
0.33
0.22
Additional CF1 may be used to accommodate the use of small
boost inductor or to eliminate the differential mode filter inductor
as long as the equipment meets the power factor or goal.
Thehttp://www.DataSheet4U.net/ equivalent negative capacitor is a function of the input
voltage divider ratio, KBO, the current sensing gain and current
compensation error integration gain.
Adjusting the negative Ceq can be achieved by adjusting the
current compensation network.
Frequency Modulation
The ISL6730A, ISL6730B, ISL6730C, ISL6730D can further
reduce EMI filter size by lowering the differential noise power
density. The reduction is achieved by switching frequency
modulation.
The frequency varies with the VIN pin. The switching frequency
reaches the peak value when the VIN pin voltage is 2V as shown
in Figure 6. The peak value of ISL6730A/C is 124kHz, and the
ISL6730B/D is 62kHz.
Output Voltage Regulation
The output voltage is sensed through a resistor divider. The
middle point of the resistor divider is fed to the FB pin. The
resistor divider ratio sets the output voltage. The
transconductance error amplifier generates a current in
proportion to the difference between the FB pin and the 2.5V
internal reference. The PFC is stabilized by the compensation
network that is connected from the COMP pin to the ground.
The voltage of the COMP sets the input average power by
determining the amplitude of the current reference. To keep the
11
FN8258.0
February 26, 2013
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL6730C.PDF ] | |
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