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參數(shù)資料
| 型號： | MR2940 |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 英文描述： | Provision for Standby mode operation Partial Resonance Power Supply IC Module |
| 中文描述： | 撥備待機模式操作局部共振電源IC模塊 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大小： | 226K |
| 代理商： | MR2940 |
Shindengen Electric MFG.CO.,LTD
- 10 -
3.7 Circuit for Load Shorts
The MR2000 Series is designed so that when droop occurs under excessive load, output voltage drops, and control coil voltage
drops in proportion.
When the control coil voltage falls below 4.5V (typical) the standby mode is selected and the Emitter/OCL pin threshold voltage
changes from 0.6V to 0.05V, thus limiting the collector current to approximately 1/10th of its previous value.
This design permits a reduction in the stress on the MR2000 Series IC in the case of a load short, and control of the short-circuit
current in the secondary diode and load circuit.
3.8 Collector Pin (pin 7)
The collector pin on the main switching device.
The transformer is designed, and the resonating condenser adjusted, to ensure that V
CE(max)
is less than 900V.
Depending upon input conditions, the collector pin may be subjected to reverse bias for a period during partial resonance.
This IC employs an ultra high-speed IGBT in the main switching device. This device differs from MOSFET devices in that it has no
body diode structure, thus requiring connection of an external high-speed diode between the Collector and Emitter/OCL pins.
3.9 Thermal Shut-down Circuit (TSD)
The MR2000 Series incorporates a thermal shut-down circuit.
The onboard IC is latched at 150
°
C (typical) and oscillation is then stopped.
Unlatch is achieved by momentarily dropping the voltage at the V
cc
pin to V
UL
(unlatch voltage) or lower.
3.10 Over-voltage Protection Circuit (OVP)
The MR2000 Series incorporates an over-voltage protection circuit (OVP).
Latching occurs when the control coil voltage exceeds 20V (typical), and secondary output over-voltage protection then operates
indirectly.
Unlatch is achieved in the same manner as for the overheat protection circuit.
Fig.3.10 Circuit for Load Shorts
【
V
Z/C
】
【
I
C
】
【
V
CC
】
Load short
【
V
OUT
】
4.5V(TYP)
I
CP
limited when V
Z/C
falls
below 4.5V (typical).
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