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PDF BM2P0391 Data sheet ( Hoja de datos )
| Número de pieza | BM2P0391 | |
| Descripción | PWM type DC/DC converter IC Included 650V MOSFET | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
AC/DC Drivers
PWM type DC/DC converter IC
Included 650V MOSFET
BM2P0391
●General
The PWM type DC/DC converter BM2P0391 for
AC/DC provides an optimum system for all products
that include an electrical outlet.
BM2P0391 supports both isolated and non-isolated
devices, enabling simpler design of various types of
low-power electrical converters.
BM2P0391 built in a HV starter circuit that tolerates
650V, it contributes to low-power consumption.
With current detection resistors as external devices, a
higher degree of design freedom is achieved.
Switching frequency adopts fixed system. Since
current mode control is utilized, current is restricted in
each cycle and excellent performance is demonstrated
in bandwidth and transient response.
The switching frequency is 100 kHz. At light load, the
switching frequency is reduced and high efficiency is
achieved.
A frequency hopping function is also on chip, which
contributes to low EMI.
●Basic Specifications
Operating Power Supply Voltage Range :
VCC: 8.9V to 26.0V
DRAIN: to 650V
Operating Current : Normal Mode 1.000mA (Typ)
Burst Mode 0.400mA (Typ)
Oscillation Frequency :
Operating Temperature :
100kHz (Typ)
-40 oC to +105 oC
MOSFET ON Resistance :
2.4Ω (Typ)
●Application circuit
●Features
PWM frequency : 100kHz
PWM current mode method
Frequency hopping function
Burst operation when load is light
Frequency reduction function
Built-in 650V start circuit
Built-in 650V switching MOSFET
VCC pin under voltage protection
VCC pin overvoltage protection
SOURCE pin Open protection
SOURCE pin Short protection
SOURCE pin Leading-Edge-Blanking function
Per-cycle over current protection circuit
Soft start
Secondary Over current protection circuit
BR pin AC input low voltage protection
●Package
DIP7K: 9.20mm×6.35mm×4.30mm pitch 2.54mm
(Typ) (Typ) (Max)
(Typ)
●Applications
AC adapters, TV and household appliances (vacuum
cleaners, humidifiers, air cleaners, air conditioners, IH
cooking heaters, rice cookers, etc.)
AC
85-265 Vac
+
FUSE
-
Filter
Diode
Bridge
ERROR
BR AMP
Figure 1. Application circuit
○Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/18
TSZ02201-0F1F0A200150-1-2
12.JULY.2016.Rev.001
1 page  
BM2P0391
●Block Diagram
Datasheet
Figure 3. Block Diagram
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/18
TSZ02201-0F1F0A200150-1-2
12.JULY.2016.Rev.001
5 Page 
BM2P0391
Datasheet
( 5 ) Over current limiter
BM2P0391 is built in over current limiter per cycle. If the SOURCE pin exceeds a certain voltage, switching is stopped.
It is also built in AC voltage compensation function. This is the function which compensates the maximum power as the
AC voltage’s change by increasing over current limiter with time.
Shown in Figure 12, 13 and14.
240V
Figure 12. No AC voltage compensation function
Figure 13. Built-in AC compensation voltage
Primary peak current is decided as the formula below.
Primary peak current: Ipeak = Vcs/Rs + Vdc/Lp*Tdelay
Vcs: Over current limiter voltage internal IC, Rs: Current detection resistance, Vdc: Input DC voltage,
Lp: Primary inductance, Tdelay: delay time after detection of over current limiter
Figure 14. Over current limiter voltage
( 6 ) L.E.B. period
When the driver MOSFET is turned ON, surge current occurs at each capacitor component and drive current.
Therefore, because SOURCE pin voltage rises temporarily, the detection errors may occur in the over current limiter
circuit. To prevent this detection errors, DRAIN is switched from high to low and the SOURCE signal is masked for
250nsec by the on-chip L.E.B. (Leading Edge Blanking) function.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/18
TSZ02201-0F1F0A200150-1-2
12.JULY.2016.Rev.001
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet BM2P0391.PDF ] | |
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