參數(shù)資料
型號(hào): ISL6551IRZ
廠商: INTERSIL CORP
元件分類: 穩(wěn)壓器
英文描述: ZVS Full Bridge PWM Controller
中文描述: DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC28
封裝: 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220VJJC, QFN-28
文件頁(yè)數(shù): 19/26頁(yè)
文件大?。?/td> 604K
代理商: ISL6551IRZ
19
FN9066.5
January 3, 2006
Feedback
Secondary Control -
In secondary side control systems,
only a few resistors and capacitors are required to complete
the feedback loop.
Primary Control -
This feedback loop configuration for
primary side control systems requires an optocoupler for
isolation. The bandwidth is limited by the optocoupler.
Rectifiers
Current Doubler Rectifiers -
1. Synchronous FETs are used for low output voltage, high
output current and/or high efficiency applications.
2. Schottky diodes are used for lower current applications.
Pins S+ and S- are connected to the output filter and the
main transformer with current doubler configurations.
Conventional Rectifiers -
1. Synchronous FETs are used for low output voltage, high
output current and/or high efficiency applications.
2. Schottky diodes are used for lower current applications.
Pins S+ and S- are connected to the main transformer
with conventional configurations.
Self-Driven Rectifiers -
For low output voltage applications,
both FETs can be driven by the voltage across the
secondary winding. This can work with all kinds of main
transformer configurations as shown in Figures 18A-D.
FIGURE 16A. SECONDARY CONTROL
FIGURE 16B. PRIMARY CONTROL
EAO
EAI
VOPOUT
VOPOUT
IL207
TL431
VREF = 5V
EAI
EAO
FIGURE 17A. CURRENT DOUBLER RECTIFIERS
FIGURE 17B. CONVENTIONAL RECTIFIERS
FIGURE 17C. SELF-DRIVEN RECTIFIERS
SYNCHRONOUS FETs
SCHOTTKY
S+
SYNP
SYNN
S+
S–
S–
S+
S–
SYNN
SYNP
SYNCHRONOUS FETs
SCHOTTKY
S–
S+
S+
S–
ISL6551
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