参数资料
型号: AN-14
英文描述: TOPSwitch Tips. Techniques & Troubleshooting Guide
中文描述: TOPSwitch的提示。技术
文件页数: 5/28页
文件大小: 246K
代理商: AN-14
B
6/96
AN-14
5
POWER SUPPLIES REGULATED WITH OPTICAL COUPLED FEEDBACK
CAUSE
SYMPTOM
WHAT TO DO
Insufficient gain/phase margin
due to:
Output has (
π
-filter) filter
adding additional phase shift
to control loop.
Improper compensation
Optocoupler current transfer
ratio (CTR) too high
Control loop is too slow
Control loop bandwidth too low
Input capacitor too small
Power Supply Oscillates
Output voltage turns on too
fast or overshoots
Output voltage line frequency
ripple too large
Connect optical coupler to the rectifier side of
π
section
(Section 12.1)
Increase resistor in series with optocoupler LED
(Section 12.1)
Increase size of auto-restart/compensation capacitor
across Control and Source pins
Increase or add resistor in series with auto-restart/
compensation capacitor (Section 12.1)
Use optical coupler with CTR between 50% and 200%
(Section 16)
Increase control loop bandwidth
Add soft start capacitor (between 4.7
μ
F and 47
μ
F)
across error amplifier output or Zener diode
(Section 14)
Increase control loop bandwidth
Increase input capacitor
POWER SUPPLIES REGULATED WITH BIAS WINDING FEEDBACK
CAUSE
SYMPTOM
WHAT TO DO
Insufficient gain/phase margins
Control loop is too slow
Leakage inductance spike on bias
winding
Discontinuous mode operation
Power Supply Oscillates
Output voltage turns on too
fast or overshoots
Poor load regulation
Increase output capacitance
Increase size of auto-restart/compensation capacitor
Add or increase resistor R3 in series with auto-restart/
compensation capacitor (Section 12.1)
Increase control loop bandwidth
Add RC soft start network (Section 14)
Add resistor in series with bias winding to filter leakage
inductance spike (See DN-8)
Change transformer winding order so that primary is
first and bias winding is last
On bias winding, use parallel, oversized diameter wire
so bias winding completely covers width of bobbin
Redesign transformer for continuous mode operation
相关PDF资料
PDF描述
AN-21 TOPSwitch-II Flyback Quick Selection Curves
AN-26 TOPSwitch-FX Flyback Quick Selection Curves
AN-35 LinkSwitch Design Guide
AN002M4-78 SP4T RF Absorptive Switch
AN002R2-29 SPDT RF Reflective Switch
相关代理商/技术参数
参数描述
AN1405D 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:3.3V / 5V ECL 2-Input Differential XOR/XNOR
AN1406 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:DESIGNING WITH PECL (ECL AT + 5.0)
AN1406/D 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:DESIGNING WITH PECL (ECL AT + 5.0)
AN1406D 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:3.3V / 5V ECL 2-Input Differential XOR/XNOR
AN14-17A 制造商:AN# - MILITARY 功能描述: