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HV9606

更新时间： 2024-11-10 22:48:27
品牌 Logo 应用领域
超科 - SUPERTEX 监控控制器
页数 文件大小 规格书
9页 519K
描述
HV9606 Current-Mode PWM Controller with Supervisor

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中文翻译

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HV9606 数据手册

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HV9606  
Initial Release  
HV9606 Current-Mode PWM Controller with Supervisor  
Features  
General Description  
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Synchronous Forward, Forward, and Flyback Controller  
Lowest External Parts Count, Smallest Magnetics  
Eliminates Bootstrap Transformer Winding  
Supervisor Circuit Reduces Output Capacitance* up to 40%  
Supervisor Circuit Functions as µP Supply Monitor and POR  
15V to 250V Start-Up Regulator with START/STOP Control  
<1mA Operating, <6µA Standby Input Current  
VDD Powered Operation down to 2.9V  
The HV9606 PWM controller allows the design of high efficiency  
(>90%) power supplies for distributed board mounted power (BMP)  
applications. Due to its high frequency capability it can provide  
high currents (20A @ 3.3V) with small transformers and due to its  
low internal operating voltage and current is also able to achieve  
high efficiencies in low power applications.  
Charge Pump Gate Drive Supply  
The HV9606 utilizes fixed frequency current mode control with duty  
cycle internally limited to <50%. It supports both isolated and non-  
isolated topologies and provides all the necessary functions to  
implement a flyback, forward or synchronous forward converter  
with a minimum of external parts. Due to its low VDD operation the  
bootstrap magnetic winding is eliminated in non-isolated  
topologies. An on chip charge pump generates the gate drive  
voltage for driving an external N-channel MOSFET and eliminates  
the need for clamping by offering 250V immunity to high voltage  
transients common in telecom and network systems. It conforms  
to the requirements of IEEE 802.3 Powered Ethernet and ETR-080  
ISDN specifications.  
Programmable Soft Start  
Under Voltage Lockout with Programmable Hysteresis  
<50% Duty Cycle Operation  
15kHz to 400kHz Fixed Frequency PWM Operation  
Fault Tolerant Peer-to-Peer Synchronization  
Precision !1% Band Gap Voltage Reference  
Current Sense Leading Edge Blanking  
Small SSOP-20 Footprint  
*For short duration line loss, supervisor disables soft start if output  
within tolerance when VIN returns and thus reduces holdup  
requirements.  
The oscillator is programmable and provides fault tolerant peer-to-  
peer synchronization to other similar circuits or master clock. The  
chip draws almost no current (<6µA @ VIN < 20V) until the  
programmable START/STOP thresholds of the start-up regulator  
are satisfied. It can also be powered via the VDD pin, rather than  
the VIN pin, in the range of 2.9V to 5.5V.  
Applications  
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Powered Ethernet and VoIP Terminals  
Cable Modems and Amplifiers  
ISDN Network Terminations, Terminals and Adapters  
Network Equipment  
Other functions include leading edge current sense blanking,  
programmable SOFT START, precision !1% band gap reference  
and a SUPERVISOR CIRCUIT. The SUPERVISOR can provide  
housekeeping functions such as µP supply monitoring and reset,  
soft start inhibit for rapid restart on short duration input voltage  
interruption. It also minimizes input and output capacitance  
requirements.  
Servers, PCs and Peripheral Equipment  
Telecommunication Systems and Terminals  
Distributed Board Mounted Power  
Battery Backup Systems  
Portable Power Applications  
Automotive and Heavy Equipment  
Typical Application Circuit  
10W Non-Isolated 48V to 3.3V Flyback Converter  
R3  
R2  
To uP  
RESET  
Pin.  
C9  
C2  
1
2
VDD  
STATUS  
SENSE  
20  
19  
Q1  
START  
3
4
STOP  
Vin  
FB  
18  
17  
R1  
C7  
C8  
R6  
COMP  
+48V  
C4  
T1  
D1  
5
6
7
REF  
SS  
NI  
CA  
CB  
16  
15  
14  
+3.3V  
C10  
R7  
R8  
R9  
C3  
R4  
C6  
C5  
SYNC  
RT  
8
9
VX2  
13  
12  
C1  
R10  
M1  
SGND  
PGND  
GATE  
10  
CS  
11  
R5  
GND  
GND  
To SYNC pin of other HV9606 PWMs.  
1
4/15/2002-R.L2  
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com  
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