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PDF BD7F200HFN-LB Data sheet ( Hoja de datos )

Número de pieza BD7F200HFN-LB
Descripción Optocoupler-less Isolated Flyback Converter
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
Optocoupler-less
Isolated Flyback Converter
BD7F200HFN-LB BD7F200EFJ-LB
General Description
This product guarantees long time supply availability in
the industrial instrumentation market.
BD7F200 is an optocoupler-less Isolated Flyback
Converter. An optocoupler or the tertiary winding
feedback circuit which was needed to obtain a stable
output voltage isolated by a transformer in the
conventional application becomes unnecessary, thus,
the number of parts is reduced drastically, producing a
small-sized and high-reliability application isolated type
power supply.
Furthermore, a highly by the use of the Original
Adapted-Type ON-Time Control Technology, it makes
the external phase compensation parts become
unnecessary, therefore a highly efficient isolated type
power supply application can easily be produced.
Key Specifications
Supply Voltage of Operation:
SW Terminal Operating Voltage:
Over Current Limit:
Switching Frequency:
Reference Voltage Accuracy:
Quiescent Current:
Operating Current:
Junction Temperature of Operation:
8V to 40V
50V (Max)
2.75A (Typ)
400kHz (Typ)
±1.5% (Typ)
0µA (Typ)
2mA (Typ)
-40°C to +125°C
Packages
HSON8
HTSOP-J8
W(Typ) D(Typ) H(Max)
2.90mm x 3.00mm x 0.60mm
4.90mm x 6.00mm x 1.00mm
Features
Guaranteed long time supply availability for
Industrial Applications.
No need for an optocoupler or a transformer tertiary
winding.
The output voltage can be set by two external
resistors and the transformer turns ratio.
Uses Original Adapted Type ON-Time Control
Technology.
High-speed load response is realized and external
phase compensation parts are unnecessary.
Fixed switching frequency and low output ripple
Highly efficient light load mode available (PFM
operation)
Shutdown / Enable Control
Built-in N-Channel MOSFET
Soft start function
Output load compensation function
Protection functions:
VIN Under Voltage Lock-Out (VIN UVLO)
Over Current Protection (OCP)
Thermal Shutdown Protection (TSD)
HSON8
HTSOP-J8
Application
Industrial equipment Isolated Power Supply
O Product structure : silicon monolithic integrated circuit
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
O This product has no designed protection against radioactive rays
1/27
TSZ02201-0J1J0AZ01220-1-2
24.Mar.2016 Rev.002

1 page




BD7F200HFN-LB pdf
BD7F200HFN-LB BD7F200EFJ-LB
Datasheet
Electrical Characteristics (Unless otherwise specified Ta = 25°C, VIN = 24V, and VSDX/EN = 2.5V.)
Parameter
Symbol
Limit
Unit
Min Typ Max
Conditions
Power Supply
Quiescent Current
Operating Current
UVLO Detection Voltage
UVLO Hysteresis Voltage
IST - 0 10 µA VSDX/EN = 0V
ICC
-
2
4
mA
VSDX/EN = 2.5V
VREF = 2V (at PFM operation)
VUVLO 5.7 6.2 6.7 V VIN falling
VUVLO_HYS
0.6
0.7
0.8
V
SDX/EN Control
Shutdown Voltage
VSDX
0.3 0.9 1.5 V
Enable Voltage
Enable Hysteresis Voltage
SDX/EN Input Current
VEN 1.9 2.0 2.1 V VSDX/EN rising
VEN_HYS
0.15
0.2
0.25
V
ISDX/EN
-
0
1 µA VSDX/EN=2V
Reference Voltage
Reference Voltage
VREF
0.768 0.78 0.792 V
Switch Characteristics
ON-Resistance
Over Current Limit
Switching Frequency
Minimum ON Time
RON - 0.5 - Between SW - PGND terminals
ILIMIT
2.2 2.75 3.3
A
fSW - 400 - kHz At PWM operation (Duty=40%)
tON_MIN - 350 - ns
Minimum OFF Time
tOFF_MIN
-
300
- ns
Maximum OFF Time
tOFF_MAX
-
20
- µs
Soft Start Time
tSS - 6 - ms 0V to (VREF×90%)
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/27
TSZ02201-0J1J0AZ01220-1-2
24.Mar.2016 Rev.002

5 Page





BD7F200HFN-LB arduino
BD7F200HFN-LB BD7F200EFJ-LB
Datasheet
Application Information
1. Outline Operation
This product is an isolated type flyback converter without an optocoupler. An optocoupler or a transformer’s tertiary winding
feedback circuit which was needed to obtain a stable output voltage isolated by a transformer in the conventional
application becomes unnecessary, thus, the number of parts is reduced drastically, producing a small-sized and
high-reliability application isolated type power supply.
Furthermore, a highly efficient isolated type power supply application can easily be produced the use of the Original
Adapted-Type ON-Time Control Technology which eliminates the need for external phase compensation parts.
The off time is determined by comparing the reference voltage inside the IC with the information which was obtained by the
feedback of the secondary output voltage through primary flyback voltage.
Adapted-type ON time control,
(1) Switching frequency is fixed at 400kHz (Typ) for PWM operation when the load stabilizes.
(2) During load current fluctuation, the ON-Time Control will operate and the switching frequency will change, thus a
high-speed load response is obtained.
(3) During light load, high efficiency is obtained because the switching frequency decreases.
2. Timing Chart
(1)Start-up/Shut-down
Output voltage gradually turns ON through the soft start function when SDX/EN terminal rises to above 2.0V(Typ) (Enable
state) .When SDX/EN terminal falls below 1.8V (Typ), output voltage turns OFF (Disable state).
Figure 15. Start-up/Shut-down Timing Chart
(Note 1) In the control system of this IC, it has to be operated where duty is below 50%. When turning ON/OFF the IC,
control the SDX/EN terminal as enable/disable under the condition where VIN fulfills below equation.
  V IN
NP
NS
VOUT
VF
[V]
where:
VIN is the VIN input power voltage
Np is the number of turns in the transformer primary side
Ns is the number of turns in the transformer secondary side
VOUT is the output voltage
VF is the forward voltage of the output diode in the secondary
side
If SDX/EN terminal is connected to VIN terminal, duty could be more than 50% and unexpected output voltage might occur
when turning ON/OFF. Please refer to ”8. Enable Voltage” on page 15 of the application information for the enable control
with VIN terminal.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/27
TSZ02201-0J1J0AZ01220-1-2
24.Mar.2016 Rev.002

11 Page







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