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| 型号： | RDK-91 |
| 厂商： | Power Integrations |
| 文件页数： | 8/35页 |
| 文件大小： | 0K |
| 描述： | KIT DESIGN REF TINYSWITCH-III |
| 标准包装： | 1 |
| 系列： | TinySwitch®-III |
| 主要目的： | AC/DC，主面 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 12W |
| 输出电压： | 12V |
| 电流 - 输出： | 1A |
| 输入电压： | 85 ~ 265VAC |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 装有元件的板，裸板，样品 IC |
| 已用 IC / 零件： | TNY274，TNY275，TNY276，TNY277，TNY278，TNY279，TNY280 |
| 产品目录页面： | 1202 (CN2011-ZH PDF) |
| 相关产品： | 732-2250-ND - TRANS OFF LINE POWER PI TNY278 596-1115-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1114-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1113-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1112-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1111-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1109-6-ND - IC OFFLINE SWIT OVP OTP HV 8SMD 596-1260-5-ND - IC OFFLINE SWIT OVP OTP HV 8DIP 596-1259-5-ND - IC OFFLINE SWIT OVP OTP HV 8DIP 596-1258-5-ND - IC OFFLINE SWIT OVP OTP HV 8DIP 更多... |
| 其它名称： | 596-1194 |
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RDR-91 12 V, 1 A, Universal Input Supply
11-Feb-13
4.3 Output Rectification and Filtering
Diode D7 rectifies the output of T1. Output voltage ripple was minimized by using a low
ESR capacitor for C10 (see Section 6 for component part numbers and values). A post
filter (ferrite bead L2 and C11) attenuates the high frequency switching noise.
4.4 Feedback and Output Voltage Regulation
The supply’s output voltage regulation set point is set by the voltage that develops across
Zener diode VR3, R6 and the LED in optocoupler U2. The value of R4 was calculated to
bias VR3 to about 0.5 mA when it goes into reverse avalanche conduction. This ensures
that it is operating close to its rated knee current. Resistor R6 limits the maximum current
during load transients. The values of R4 and R6 can both be varied slightly to fine-tune
the output regulation set point. When the output voltage rises above the set point, the
LED in U2 becomes forward biased. On the primary-side, the photo-transistor of U2 turns
on and draws current out of the EN/UV pin of U1. Just before the start of each switching
cycle, the controller checks the EN/UV pin current. If the current flowing out of the EN/UV
pin is greater than 115 ? A, that switching cycle will be disabled. As switching cycles are
enabled and disabled, the output voltage is kept very close to the regulation set point.
For greater output voltage regulation accuracy, a reference IC such as a TL431 can be
used in place of VR3.
4.5 Output Overvoltage Shutdown
The TinySwitch-III family of ICs can detect overvoltage on the output of the supply and
latch off. This protects the load in an open feedback loop fault condition, such as the
failure of the optocoupler. Overvoltage on the output is detected through the
BYPASS/MULTI-FUNCTION (BP/M) pin and the bias winding on the transformer. The
bias winding voltage is determined by the reflection of the output voltage through the
turns ratio of the transformer. Therefore, an overvoltage on the output will be reflected
onto the bias winding. The overvoltage threshold is the sum of the breakdown voltage of
Zener diode VR2 and the BP/M pin voltage (28 V + 5.8 V). If the output voltage becomes
abnormally high, the voltage on the bias winding will exceed the threshold voltage and
excess current will flow into the BP/M pin. The latching shutdown circuit is activated when
current into the BP/M pin exceeds 5 mA. Resetting a latched shutdown requires removing
the AC input from the supply long enough to allow the input capacitors (C1 and C2) to
discharge, and the BP/M pin voltage to drop below 2 V. Resistors R7 and R3 provide
additional filtering of the bias voltage, with R3 also limiting the maximum current into the
BYPASS pin in an OV condition
4.6 EMI Design Aspects
An input pi filter (C1, L1 and C2) attenuates conducted, differential mode EMI noise.
Shielding techniques (E-Shield?) were used in the construction of T1 to reduce common
mode EMI displacement currents. Resistor R2 and capacitor C4 dampen out some of the
high frequency ringing that occurs when the power MOSFET turns off. When combined
with the IC’s frequency jitter function, these techniques produce excellent conducted and
radiated EMI performance (see Section 12 of this report).
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 8 of 35
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