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PDF ISL6726 Data sheet ( Hoja de datos )
| Número de pieza | ISL6726 | |
| Descripción | Active Clamp Forward PWM Controller | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Active Clamp Forward PWM Controller
ISL6726
The ISL6726 is a highly featured single-ended PWM controller
intended for applications using the active clamp forward
converter topology in either n- or p-channel active clamp
configurations, the asymmetric half-bridge topology, and the
standard forward topologies with synchronous rectification. It is a
current-mode PWM controller with many features designed to
simplify its use. Among its many features are a precision
oscillator which allows accurate control of the deadtime and
maximum duty cycle, bi-directional synchronization with 180°
phase shift for interleaving applications, adjustable soft-start and
soft-stop, a low power disable mode, and average current limit
for “brick-wall” overcurrent protection.
This advanced BiCMOS design features low start-up and
operating currents, adjustable switching frequency to greater
than 1MHz, high current FET drivers, and very low propagation
delays for a fast response to overcurrent faults.
Applications
• Telecom and Datacom Power Supplies
• AC/DC Power Supplies
• Battery Chargers
Features
• Precision Maximum Duty Cycle and Deadtime Control
• 125µA Typical Start-up Current
• Adjustable Peak and Average Current Limit Protection
• Programmable Oscillator Frequency
• Bi-Directional Synchronization with 180° Phase Shift for
Interleaved Converter Applications
• Adjustable Soft-Start and Selectable Soft-Stop
• Selectable Minimum Duty Cycle Clamp for Synchronous
Rectifier Applications
• Programmable Slope Compensation
• Supports N- and P-Channel Active Clamp FETs
• Programmable Switch Timing Between Main and Active Clamp
Outputs
• Programmable Undervoltage Lock-Out (UV)
• Input Voltage Dependent Duty Cycle Clamp
• ENABLE Input with Low Power Disable
• Internal Over-Temperature Protection
• Pb-Free (RoHS Compliant)
+VIN
+VIN
-VIN
LEVEL
SHIFT
OUTAC
OUTM
OUTAC
N- or P- CHANNEL ACTIVE CLAMP FORWARD
-VIN
OUTM
LEVEL
SHIFT
OUTAC
ASYMMETRIC HALF-BRIDGE
www.DataSheet4U.com
January 31, 2011
FN7654.0
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 Inc. 2011. 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.
1 page  
Typical Application Using ISL6726 - Active Clamp Forward with Synchronous Rectification
VIN+
VIN-
SYNC
ON/OFF
VCC (+10V)
R1
R2 R3
T1
T2
Q3
L1
Q4 +
C13
CR1
C12
Q1
C1
R22
Q2
R14
CR2
1 SYNC
SS 20
2 DCLIM U1 MODE 19
3 UV
DELAY 18
4 ENABLE VREF 17
5 RTC
GND 16
6 CT
OUTM 15
C5
7 ISET
VDD 14
R8
R5
8 VERR
9 FB
OUTAC 13
SLOPE 12
10 CS
IOUT 11
R4
C2 R7
R13
C9
R22
Q5
R23
R24
C14
R25
T2 CR3
C15
R16
R15
R17
R18 R19
C11
R10
C3 R6 R9
C4 C6 C7
R11 R12
C8
U2
VR1
R21 C10
U4 R20
+Vout
RETURN
5 Page 
ISL6726
Typical Performance Curves
1000
RTC = 10kΩ
1.010
RTC = 25kΩ
1.005
100 1.000
RTC = 50kΩ
0.995
10
0.1
1
CT (nF)
FIGURE 1. OSCILLATOR FREQUENCY vs CT and RTC
10
600
500 OVERLAP
400
300
NON-OVERLAP
200
100
0
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
DELAY RESISTANCE (kΩ)
FIGURE 3. DELAY TIME vs RESISTANCE
1.05
1.04
1.03
1.02
RDELAY = 20k
1.01
1.00
RDELAY = 120k
0.99
0.98
www.DataSheet4U.com
0.97
RDELAY = 200k
0.96
0.95
-40 -25 -10 5
20 35 50 65 80 95 110
TEMPERATURE (°C)
FIGURE 5. DELAY TIME vs TEMPERATURE (NON-OVERLAP)
11
0.990
-40 -25 -10 5
20 35 50 65 80 95
TEMPERATURE (°C)
FIGURE 2. OSCILLATOR FREQUENCY vs TEMPERATURE
110
1.05
1.04
1.03
RDELAY = 20k
1.02
1.01
1.00
RDELAY = 120k
0.99
0.98
0.97
RDELAY = 200k
0.96
0.95-40 -25 -10 5
20 35 50 65 80 95
TEMPERATURE (°C)
FIGURE 4. DELAY TIME vs TEMPERATURE (OVERLAP)
110
1.010
1.005
1.000
0.995
0.990
-40 -25 -10
5 20 35 50 65
TEMPERATURE (°C)
80 95 110
FIGURE 6. VREF vs TEMPERATURE
FN7654.0
January 31, 2011
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL6726.PDF ] | |
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