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What is BM1050AF-G?

This electronic component, produced by the manufacturer "ROHM Semiconductor", performs the same function as "Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC".


BM1050AF-G Datasheet PDF - ROHM Semiconductor

Part Number BM1050AF-G
Description Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC
Manufacturers ROHM Semiconductor 
Logo ROHM Semiconductor Logo 


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Datasheet
Quasi-Resonant Control DC/DC
converter and Power Factor Correction
converter IC for AC/DC Converter
BM1050AF-G
General Description
BM1050AF is compounded LSI of Power Factor Correction
converter (PFC) for harmonic solution and DC/DC converter
(DC/DC). Because DC/DC operates on Quasi-resonant
method, DC/DC contributes to Low EMI.
BM1050AF built in a HV starter circuit that tolerates 650V.
Because of putting the current sense resistors externally
both the PFC part and the DC/DC part, IC enables power
supply design free.
In the PFC part, IC adopts peak current control operation.
Suitable application is proposed by a various protection
circuit, such as the multiplier with a revision circuit on the AC
voltage falls, the load regulation revision circuit, and the
maximum power feed-forward circuit, etc.
Moreover, the frequency hopping function is built in and it
contributes to low EMI.
The Quasi-resonant system of a DC/DC part contributes to
low EMI because PFC operates by soft switching.
A burst mode is built in, so the power is reduced at light load.
Various protection functions, such as a soft start function, a
burst function, an over-current limiting for every cycle,
overvoltage protection, and over current protection, are built
in. The pin for communicated control with a controller and the
external stop pin are prepared; it proposes the system that
can be adapted for various applications.
Basic specifications
Operating Power Supply Voltage Range:
VCC8.5 to 24.0V
Operating Current:
QR ON (PFC OFF)1.20mA(pulse on)
QR ON (PFC OFF)1.00mA(pulse off)
QR ON (PFC ON)1.80mA(pulse on)
Oscillation Frequency QR part :120kHz(FB=2.0V typ)
Operating Temperature: -40to +85
Typical Application Circuit(s)
Features
Quasi-resonant circuit + PFC circuit
Built-in HV Starter circuit
Low consumption current (typ.10uA) when starter
circuit is OFF.
Quasi resonant circuit
Max operating frequency(120kHz)
Frequency reduction function
Over-current limiting variable function
Pulse-by-pulse over-current protection circuit
Built-in Soft start
Voltage protection function (brown out) during low
input
ZT pin Over Voltage Protection
Output overload protection (auto recovery /latch
switching enabled)
250nsec Leading-Edge Blanking
Power Factor Correction circuit
Peak current control (65kHz)
Frequency hopping function
Per-cycle over current protection circuit
Maximum power revision
the multiplier with a revision circuit when the AC
voltage falls
the load change measure circuit
Selectable protection method by LATCH/AUTOR
terminal.
LATCH/AUTOR=H : Latch
LATCH/AUTOR=L : Auto recovery
External stop function (COMP pin)
AC input voltage stop detected function (ACDET)
Built-in PFC stop terminal (PFCON/OFF)
Package(s)
SOP24 15.0mm×5.40mm ×1.80mm pitch1.27mm
(Typ.) (Typ.) (TYP.) TYP.
Applications
TV, AC adapters, printers, LED lighting
Figure 1. Application circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed for protection against radioactive rays
1/47
TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003

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BM1050AF-G equivalent
BM1050AF-G
Datasheet
Electrical Characteristics (Unless otherwise noted Ta=25, VH_IN=320Vdc, VCC=12V)
Parameter
Symbol
Specifications
Minimum Standard Maximum
Unit
[Quasi-resonant Control Block]
[Quasi-resonant DC/DC converter Block (turn off)]
QR_FB pin pull-up resistance
CS over-current
detect voltage 1A
RFB
Vlim1A
15
0.950
20
1.000
CS over-current
detect voltage 1B
Vlim1B
0.630
0.700
CS over-current
detect voltage 1C
Vlim1C - 0.250
CS over-current
detect voltage 1D
Vlim1D
-
CS over-current
detect voltage 2A
CS switched ZT current
CS Leading
Edge Blanking time
Turn off time
Minimum ON width
Vlim2A
IZT
TLEB
TOFF
Tmin
-
0.800
-
-
-
[Quasi-resonant DC/DC converter Block (turn on)]
Maximum operating
frequency 1
Maximum operating
frequency 2
Frequency reduction
start FB voltage
Frequency reduction
end FB voltage
FSW1
FSW2
VFBSW1
VFBSW2
106
24
1.15
0.35
0.750
0.150
1.000
0.250
0.250
0.500
120
30
1.250
0.50
Voltage gain
AVCS
1.70
2.00
ZT comparator voltage 1
VZT1 60 100
ZT comparator voltage 2
VZT2 300 400
ZT trigger timeout period
TZTOUT
-
15
[Quasi-resonant DC/DC converter protection functions]
Soft start time1
Soft start time2
FB OLP Voltage 1a
FB OLP Voltage 1b
TSS1
TSS2
VFOLP1A
VFOLP1B
0.60
2.60
2.5
-
1.00
4.00
2.8
2.6
FB OLP Voltage 2a
VFOLP2A
3.3
3.6
FB OLP Voltage 2b
VFOLP2B
-
3.4
FB OLP mode switched
external connected resistor
FB OLP timer
ZT OVP Voltage
[QR_OUT pin]
QR_OUT pin
PMOS ON resistor
QR_OUT pin
NMOS ON resistor
[QR_SEL pin]
QR_SEL pin Ron
*1 Pulse is applied to QR_CS pin
*2 Pulse is applied to QR_ZT pin
RFOLP2
TFOLP
VZTL
RPOUT
RNOUT
RMASK
90
44
3.2
5
2
-
100
64
3.5
15
5
150
25
1.050
0.770
-
-
-
1.200
-
-
-
134
36
1.350
0.65
2.30
140
500
-
1.40
5.40
3.1
-
3.9
-
110
84
3.8
30
10
-
k
V
V
V
V
V
mA
us
us
us
KHz
KHz
V
V
V/V
mV
mV
us
ms
ms
V
V
V
V
k
ms
V
Conditions
Izt<1.0mA
Izt>1.0mA
Izt<1.0mA
Izt<1.0mA
QR_FB=0.3V (Izt<1.0mA)
*1
TLEBTOFF
QR_FB=2.00V
QR_FB=0.50V
V (QR_FB)/V
QR_CS
QR_ZT drop
QR_ZT rise
Count from final ZT trigger
Operate QR_FB rise
Operate QR_FB drop
Switched latch / Auto
recovery rise
Switched latch / Auto
recovery drop
QR_FB pin external
resistance value (during
latch mode)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/47
TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003


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Featured Datasheets

Part NumberDescriptionMFRS
BM1050AF-GThe function is Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC. ROHM SemiconductorROHM Semiconductor

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