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ISL78229ARZ

更新时间： 2024-11-20 01:13:23
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英特矽尔 - INTERSIL 开关
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43页 1543K
描述
2-Phase Boost Controller with Integrated Drivers

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ISL78229ARZ 数据手册

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DATASHEET  
2-Phase Boost Controller with Integrated Drivers  
ISL78227  
Features  
The ISL78227 is an automotive grade (AEC-Q100 Grade 1),  
2-phase 55V synchronous boost controller intended to simplify  
the design of high power boost applications. It integrates  
strong half-bridge drivers, an analog/digital tracking input and  
comprehensive protection functions.  
• Input/output voltage range: 5V to 55V, withstands 60V  
transients  
• Supports synchronous or standard boost topology  
• Peak current mode control with adjustable slope  
compensation  
The ISL78227 enables a simple, modular design for systems  
requiring power and thermal scalability. It offers peak-current  
mode control for fast line response and simple compensation.  
Its synchronous 2-phase architecture enables it to support  
higher current while reducing the size of input and output  
capacitors. The integrated drivers feature programmable  
adaptive dead time control offering flexibility in power stage  
design. ISL78227 offers a 90°output clock and supports 1-,  
2- and 4-phases.  
• Secondary average current control loop  
• Integrated 5V 2A sourcing/3A sinking N-channel MOSFET  
drivers  
• Switching frequency: 50kHz to 1.1MHz per phase  
• External synchronization  
• Programmable minimum duty cycle  
• Programmable adaptive dead time control  
• Optional diode emulation and phase dropping  
• PWM and analog track function  
The ISL78227 offers a highly robust solution for the most  
demanding environments. Its unique soft-start control  
prevents large negative current even in extreme cases, such as  
a restart under high output prebias on high volume  
capacitances. It also offers two levels of cycle-by-cycle  
overcurrent protection, average current limiting, input OVP,  
output UVP/OVP and internal OTP. In the event of a fault, the  
fault protection response can be selected to be latch-off or  
hiccup recovery.  
• Forced PWM operation with negative current limiting and  
protection  
• Comprehensive fault protections  
• Selectable hiccup or latch-off fault response  
• AEC-Q100 qualified, Grade 1: -40°C to +125°C  
• 5mmx5mm 32 Ld WFQFN (Wettable Flank QFN) package  
Also integrated are several functions that ease system design.  
A unique tracking input is available that can control the output  
voltage, allowing it to track either a digital duty cycle (PWM)  
signal or an analog reference. The ISL78227 provides input  
average current limiting so the system can deliver transient  
bursts of high load current while limiting the average current to  
avoid overheating.  
Applications  
• Automotive power system (e.g., 12V to 24V, 12V to 48V, etc.)  
- Trunk audio amplifier  
- Start-stop system  
- Automotive boost applications  
• Industrial and telecommunication power supplies  
PVCC  
VOUT  
PVCC  
PVCC  
100  
95  
BOOT1  
PGND  
UG1  
PH1  
RSEN1  
VIN  
90  
VO = 18V  
LG1  
VIN  
VIN  
EN  
85  
ISEN1N  
ISEN1P  
80  
VO = 24V  
EN_IC  
75  
ISL78227  
VO = 36V  
POWER-GOOD  
PGOOD  
70  
65  
60  
55  
50  
BOOT2  
UG2  
PH2  
TRACK  
CLKOUT  
SS  
RSEN2  
CLOCK_OUT  
LG2  
ISEN2N  
ISEN2P  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15  
COMP  
FB  
LOAD CURRENT (A)  
NOTE: (See Typical Application in Figure 4 on page 8.)  
FIGURE 2. EFFICIENCY CURVES, V = 12V, T = +25°C  
FIGURE 1. SIMPLIFIED APPLICATION SCHEMATIC, 2-PHASE  
SYNCHRONOUS BOOST  
IN  
A
February 24, 2016  
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 2015, 2016. 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
FN8808.2  
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