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BM1P101FJ Schematic ( PDF Datasheet ) - ROHM Semiconductor

Teilenummer BM1P101FJ
Beschreibung DC/DC converter IC
Hersteller ROHM Semiconductor
Logo ROHM Semiconductor Logo 




Gesamt 21 Seiten
BM1P101FJ Datasheet, Funktion
Datasheet
AC/DC Drivers
PWM Control type
DC/DC converter IC
BM1P061FJ / BM1P062FJ / BM1P101FJ / BM1P102FJ
General
The PWM type DC/DC converter (BM1Pxxx) for
AC/DC provide an optimum system for all products
that include an electrical outlet.
BM1Pxxx supports both isolated and non-isolated
devices, enabling simpler design of various types of
low-power electrical converters.
BM1Pxxx built in a HV starter circuit that tolerates
650V, it contributes to low-power consumption.
With switching MOSFET and current detection
resistors as external devices, a higher degree of
design freedom is achieved. Since current mode
control is utilized, current is restricted in each cycle
and excellent performance is demonstrated in
bandwidth and transient response.
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.
BM1Pxxx has rich protection.
Basic specifications
„ Operating Power Supply Voltage Range:
VCC 8.9V to 26.0V
VH
to 600V
„ Operating Current: Normal Mode0.60mA (Typ.)
Burst Mode0.35mA(Typ.)
„ Oscillation Frequency: BM1P06xFJ65kHz(Typ.)
BM1P10xFJ100kHz(Typ.)
„ Operating Temperature:
- 40deg. to +85deg.
Features
„ PWM frequency : 65kHz, 100kHz
„ PWM current mode method
„ Frequency Hopping function
„ Burst operation / Frequency reduction function
when load is light
„ Built-in 650V start circuit
„ VCC pin under voltage protection
„ VCC pin over voltage protection
„ CS pin Open protection
„ CS pin Leading-Edge-Blanking function
„ Per-cycle over current protection circuit
„ Current protection with AC voltage compensation
„ Soft start
„ Secondary Over current protection circuit
Package
SOP-J8
4.90mm×3.90mm ×1.65mm
(Typ.) (Typ.) (TYP.)
Pitch 1.27mm
TYP.
Applications
AC adapters and household appliances (vacuum
cleaners, humidifiers, air cleaners, air conditioners, IH
cooking heaters, rice cookers, etc.)
Application circuit
Line-Up
BM1P101FJ
BM1P102FJ
BM1P061FJ
BM1P062FJ
Frequency
100kHz
100kHz
65kHz
65kHz
VCCOVP
Auto Restart
Latch
Auto Restart
Latch
Figure 1Application circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
This product is not designed protection against radioactive rays
1/18
TSZ02201-0F2F0A200090-1-2
22.NOV.2012.Rev.003






BM1P101FJ Datasheet, Funktion
BM1P061FJ / BM1P062FJ / BM1P101FJ / BM1P102FJ
Datasheet
Description of Blocks
( 1 ) Start circuit (VH Pin : 8pin)
This IC built in the Start up circuit (tolerates 650V). It enables to be low standby mode electricity and high speed starting.
After starting, consumption power is idling current ISTART3typ=10uAonly.
Reference values of Starting time are shown in Figure-6. When Cvcc=10uF it can start less than 0.1 sec.
Figure 4. Block diagram of start up circuit
1.0 
0.9 
0.8 
0.7 
0.6 
0.5 
0.4 
0.3 
0.2 
0.1 
0.0 
0
5 10 15 20 25 30 35 40 45 50
Cvcc  [uF]
Figure 5. Start current vs VCC voltage
Figure 6. Start time( reference value)
* Start up current flows from the DRAIN pin
ex) Consumption power of start up circuit only when the Vac=100V
PVH100V*2*10uA=1.41mW
ex) Consumption power of start up circuit only when the Vac=240V
PVH240V*2*10uA=3.38mW
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
6/18
TSZ02201-0F2F0A200090-1-2
22.NOV.2012.Rev.003

6 Page









BM1P101FJ pdf, datenblatt
BM1P061FJ / BM1P062FJ / BM1P101FJ / BM1P102FJ
Datasheet
(7) CS pin (1pin) open protection
If the CS pin becomes OPEN, other IC may be damaged.
To prevent this damage, BM1Pxxx built in the OPEN protection circuitauto recovery protection.
(8) Output over load protection function FB OLP Comparator
The output overload protection monitors the secondary output load status at the FB pin.
This function stops a switching when an overload occurs. When there is an overload, the output voltage is dropped and the
photo coupler current becomes zero, so the FB pin voltage is rised.
When the FB pin voltage > VFOLP1A (2.8 V typ) continuously for the period T FOLP2 (32 ms typ), it is judged as an overload and
stops switching.
When the FB pin > FVFOLP1A (2.8 V typ), if the voltage goes lower than VFOLP1B (2.6V typ) during the period T FOLP2 (32 ms typ),
the overload protection timer is reset. The switching operation is performed during this period T FOLP2 (32ms typ)
At startup, the FB voltage is pulled up to the IC’s internal voltage, so the operation starts at a voltage of VFOLP1A (2.8 V typ)
or above. Therefore, at startup the FB voltage must be set to go to V FOLP1B (2.6 Vtyp) or below during the period T FOLP1 (32
ms typ), and the secondary output voltage’s start time must be set within the period T FOLP2 (32 ms typ) following startup of
the IC.
Recovery from the once detection of FBOLP, after the period T FOLP2 (512 ms typ)
Figure 15. Over load protection (Auto recovery)
A: The FBOLP comparator detects over load for FB>VFOLP1A
B: States of A continuously for the period TFOLP2 (32 ms typ), it is judged as an overload and stops switching.
C: While switching stops for the over load protection function, the VCC pin voltage drops and VCC pin voltage reaches
< VCHG , the VCC charge function operates so the VCC pin voltage rises.
D: VCC charge function stops when VCC pin voltage > VCHG2
E: If TOLPST typ =512msgo on from B point, Switching function starts on soft start.
F: If TFOLP2typ=32msgo on from E point to continues a overload condition (FB>VFOLP1A), Switching function stops at F
point.
G: While switching stops VCC pin voltage drops to < VCHG1, VCC charge function operates and VCC pin voltage rises.
H: If VCC pin (1pin) voltage becomes over VCHG2 by the VCC charge function, VCC charge function operation stops
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
12/18
TSZ02201-0F2F0A200090-1-2
22.NOV.2012.Rev.003

12 Page





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