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PDF MR2920 Data sheet ( Hoja de datos )
| Número de pieza | MR2920 | |
| Descripción | (MR2900 Series) Input Voltage Autosensing / Partial Resonance Power Supply IC Module | |
| Fabricantes | Shindengen | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MR2920 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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Input voltage autosensing
Provision for Standby mode operation
Partial Resonance Power Supply IC Module
MR2900 Series
2002/03/01
Tentative
Application Note
1 page  
MR2900
Application Note
2.1 Block Diagram
2. Block Diagram
Vcc Vin Collector
457
Unlatch
comparator UVLO comp
OVP
comparator
VUL
Z/C 1
VOVP
Thermal
Shutdown
circuit
Zero current
detection
circuit
On-dead
timer
Standby
circuit
Vref
VCC(start)
/VCC(stop)
R
Q
S
Start-up circuit
UVLO
comparator
Start-up
circuit
VCC(startup off)
/VCC(startup on)
S
Q
R
Soft drive
circuit
Q1
Excess current
detection
comparator
VTH(OCL)
F/B 2
IF/B
ON range
timer
Burst current
limit
comparator
Restart
timer
VTH(burst limit)
2.2 Pin Function Description
3
GND
6
Emitter/OCL
Pin number
1
2
3
4
5
6
7
Abbreviation
Description
Z/C
F/B
GND
Vcc
Vin
Emitter
/OCL
Collecter
Trigger input pin
Feedback signal input pin
GND pin
IC power supply pin
Start pin
Main switching device emitter and
current detection pin
Main switching device collector pin
Zero detection voltage: 0.35V
Standby: Up to 4.5V in standby mode.
ton(min) to ton(max): 1.5V to 4.5V/0μs to 25μs
Standby: Oscillation stopped at up to 0.8V.
Standby: Oscillation started at 1.8V or higher.
Oscillation start voltage: Vcc≧14V
Oscillation stop voltage: Vcc≦8.5V
Excess voltage latching voltage:Vcc=20V
Current supplied Vin→Vcc at start-up
Start-up circuit OFF:Vcc≧14V
Start-up circuit ON: Vcc≦7.6V
Excess current detection threshold:0.6V
Excess current detection threshold at standby: 50mV
-5-
Shindengen Electric MFG.CO.,LTD
5 Page 
3.11 Malfunction Prevention Circuit (patent applied for)
The use of current-critical operation in the MR2000
Series ensures that the main transformer does not
become saturated provided the droop setting is
optimized.
On the other hand, at start-up, and in the case of a
load short, the output voltage is very much less than
the set voltage.
As the control coil voltage is proportional to the output
voltage it also reaches an extremely small value, and
the on-trigger timing may be incorrectly detected due
to the ringing voltage while the device is OFF and
switched on before the current-critical point.
To counter this problem, the MR2000 Series
incorporates a circuit to prevent on-trigger malfunction
at start-up, and in the case of a load short. This function
disables the on-trigger for a period of 2.7μs (typical)
after the main switching device in the IC is switched
OFF (on-dead time). This prevents incorrect detection
due to the ringing voltage while the device is OFF.
This design permits detection of the point at which the
transformer secondary current is 0A at start-up, and in
the case of a load short. The main switching device is
then switched on at this point, allowing abnormal
oscillation to be controlled.
Enlarged
view
On-trigger disabled during
this period.
0.2V 2.5μs
【VZ/C】
【IC】
【Secondary rectification diode】
【VZ/C】
【IC】
【Secondary rectification diode】
【VCE】
【VOUT】
Fig.3.11 Comparison of Drive Circuits
3.12 Over-current Protection Circuit
A current detection resistor is connected between the
Emitter/OCL pin and GND to detect current between
the emitter of the main switching device and the emitter
current detection pin.
Body diode
Resonating
condenser
7
6
Collector pin
Emitter/OCL
pin
During stable operation the main switching device
current is limited by pulse-by-pulse operation with the
0.6V threshold value.
Current detection
resistor
The leading edge clamp function prevents
malfunctioning and thus prevents incorrect detection at
turn-on.
Fig.3.12 Current Detection Resistor
During standby, the 50mV threshold value is selected and the oscillation noise from the transformer due to burst oscillation is
reduced.
- 11 -
Shindengen Electric MFG.CO.,LTD
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MR2920.PDF ] | |
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