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PDF ISL78220 Data sheet ( Hoja de datos )
| Número de pieza | ISL78220 | |
| Descripción | 6-Phase Interleaved Boost PWM Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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DATASHEET
6-Phase Interleaved Boost PWM Controller with Light
Load Efficiency Enhancement
ISL78220
The ISL78220 6-phase controller is targeted for applications
where high efficiency (>95%) and high power are required. The
multiphase boost converter architecture uses interleaved
timing to multiply channel ripple frequency and reduce input
and output ripple. Lower ripple results in fewer input/output
capacitors and therefore lower component cost and smaller
implementation area.
The ISL78220 has a dedicated pin to initiate the phase
dropping scheme for higher efficiency at light load by dropping
phases based on the load current, so the switching and core
losses in the converter are reduced significantly. As the load
increases, the dropped phase(s) are added back to
accommodate heavy load transients and improve efficiency.
Input current is sensed continuously by measuring the voltage
across a dedicated current sense resistor or by inductor DCR.
This current sensing provides precision channel-current
balancing, and per-phase overcurrent protection. A separate
totalizing current limit function provides overcurrent protection
for all the phases combined. This two-stage current protection
provides maximum performance and circuit reliability.
The ISL78220 can also provide for input voltage tracking via
the VREF2 pin. The comparison reference voltage will be the
lower of the VREF2 pin or the internal 2V reference. By using a
resistor network between VIN and VREF2 pin, the output
voltage can track input voltage to limit the output power during
automotive cranking conditions.
The ISL78220 can output a clock signal for expanding
operation to 12 phases, which offers high system flexibility.
The threshold-sensitive enable input is available to accurately
coordinate the start-up of the ISL78220 with any other voltage
rail.
Features
• Peak current mode PWM control with adjustable slope
compensation
• Precision resistor/DCR current sensing
• 2-, 3-, 4- or 6-phase operation
• Adjustable phase dropping/diode emulation/pulse skipping
for high efficiency at light load
• Phase dropping facilitated with companion FET driver
ISL78420 (featuring tri-level input control)
• Adjustable switching frequency or external synchronization
from 75kHz up to 1MHz per phase
• Over-temperature/overvoltage protection
• 2V ±1.0% internal reference
• Pb-free, 44 Ld 10x10 EP-TQFP package (RoHS compliant)
• -40°C to +125°C operating temperature range
• AEC-Q100 qualified
Applications
• Automotive power supplies
- Start/stop DC/DC converter
- Electronic power steering systems (EPAS)
- Fuel pumps
- Injection system
• Audio trunk amplifier power supplies
• Telecom and industrial power supplies
Related Literature
• AN1726, “ISL78220EVAL1Z: 6-Phase Interleaved
Synchronous Boost Converter”
0.98
WITH PHASE DROPPING
0.97
0.96
0.95
WITHOUT PHASE DROPPING
0.94
0.93
0.92
0.91
0.90
0.89
6V INPUT, 12V OUTPUT
SYNCHRONOUS BOOST
0.88
0
5 10 15 20 25
OUTPUT CURRENT (A)
30
FIGURE 1. EFFICIENCY vs OUTPUT CURRENT vs PHASE DROPPING MODE
September 2, 2014
FN7688.4
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 2011, 2013, 2014. 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 1: 6-Phase Synchronous Boost Converter with Sense Resistor Current
Sensing
VIN
+ VCC
VOUT_SEN
FS
SS
COMP
FB
VCC
VREF2
GND
SLOPE
PLL_COMP
SYNC
CLK_OUT
PWM_INV
PWM_TRI
ISL78220
VIN
ISEN6P
ISEN6N
ISEN4P
ISEN4N
ISEN2P
ISEN2N
ISEN5P
ISEN5N
ISEN3P
ISEN3N
ISEN1P
ISEN6P
ISEN6N
ISEN4P
ISEN4N
ISEN2P
ISEN2N
ISEN5P
ISEN5N
ISEN3P
ISEN3N
ISEN1P
ISEN1N
PWM1
EN UGATE
PHASE
DRIVER
PWM
LGATE
EN
ISEN2P
ISEN2N
PWM2
EN
ISEN3P
ISEN3N
PWM3
EN
ISEN4P
ISEN4N
PWM4
EN
ISEN5P
ISEN5N
PWM5
EN
ISEN6P
ISEN6N
PWM6
PHASE 1
PHASE 2
PHASE 3
PHASE 4
PHASE 5
PHASE 6
VOUT
LOAD
+
NOTE: Please see ISL78420 for an Automotive Qualified 100V synchronous boost driver.
5 Page 
ISL78220
Typical Performance Curves (Continued)
PWM1
5V
PWM1
5V
5V
PWM3
5V
PWM5
5V
CLK_OUT
1µs/DIV
FIGURE 8. WAVEFORMS WITH PWM_INV = GND
5V
PWM3
5V
PWM5
5V
CLK_OUT
1µs/DIV
FIGURE 9. WAVEFORMS WITH PWM_INV = VCC
PWM1
5V
5V
PWM4
5V
PWM6
5A IL1
PWM_INV = GND, 8V INPUT, 30A OUTPUT
1µs/DIV
FIGURE 10. FULL LOAD WAVEFORMS
2V
EN
5V
VCC
6V INPUT, 1A OUTPUT
5V
PGOOD
5V
VOUT
5ms/DIV
FIGURE 11. ENABLE/DISABLE WAVEFORMS
VREF2
1V
6V INPUT, 30A OUTPUT
5V VOUT
5ms/DIV
FIGURE 12. MODULATING VREF2 INPUT
Submit Document Feedback 11
FN7688.4
September 2, 2014
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISL78220.PDF ] | |
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