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:
VCC：8.5 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: -40℃ to +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
structure：Silicon monolithic integrated circuit
.
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© 2013 ROHM Co., Ltd. All rights reserved.
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○This
product is not designed for protection against radioactive rays
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TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003
BM1050AF-G
●Absolute
Maximum Ratings (Ta = 25℃)
Parameter
Maximum applied voltage 1
Maximum applied voltage 2
Maximum applied voltage 3
Maximum applied voltage 4
output peak current 1
output peak current 2
QR_ZT pin current 1
QR_ZT pin current 2
Allowable dissipation
Operating temperature range
Maximum junction temperature
Storage temperature range
Symbol
V
max1
V
max2
V
max3
V
max4
I
OH
I
OL
I
SZT
1
I
SZT2
P
d
T
opr
T
jmax
T
str
Rating
650
30
5.5
15
-0.5
1.0
-2.0
3.0
687.6 (Note1)
-40
½
+85
150
-55
½
+150
Unit
V
V
V
V
A
A
mA
mA
mW
o
C
o
C
o
C
Conditions
Datasheet
VH_IN
VCC, QR_SEL
P_BO, P_VSEO, P_VS, P_BOPK
P_CS,PFCON/OFF,COMP,
ACDET, ACTIMER,QR_CS, QR_ZT,
QR_FB,LATCH/AUTOR, VREF
GCLAMP, P_OUT, QR_OUT
QR_OUT, P_OUT
QR_OUT, P_OUT
(Note1) When mounted (on 70 mm × 70 mm, 1.6 mm thick, glass epoxy on single-layer substrate).
Reduce to 5.5 mW/C when Ta = 25C or above.
●Operating
Conditions (Ta = 25℃)
Parameter
Power supply voltage range 1
Power supply voltage range 2
Power supply voltage range 3
Symbol
VCC
VH_IN
P_BO
Rating
8.5½24.0
80½600
0.0½1.8
Unit
V
V
V
Conditions
VCC
VH_IN
P_BO
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0F2F0A200140-1-2
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BM1050AF-G
●Electrical
Characteristics (Unless otherwise noted ,Ta=25,VH_IN=320Vdc,VCC=12V)
Specifications
Parameter
Symbol
Unit
Minimum
Standard Maximum
［ACDET
pin characteristics½
ACDET pin ON resister
R
ACDET
50
100
200
Ω
［ACTIMER
pin characteristics½
ACTIMER pin input L level
V
ACTIMEL
-
-
0.3
V
ACTIMER pin input H level
V
ACTIMEH
1.2
-
-
V
ACTIMER pin
R
ACTIMEH
165
330
500
kΩ
pull-down resistor
［PFCON/OFF
pin characteristics½
PFCON/OFF pin input L level
V
PON/OFFL
-
-
0.3
V
PFCON/OFF pin input H level
V
PON/OFFH
1.2
-
-
V
PFCON/OFF pin
R
PON/OFFH
50
100
150
kΩ
pull-down resistor
PFCON/OFF pin timer time
T
PFCON/OFF
0.50
1.50
3.00
ms
［LATCH/AUTOR
pin characteristics½
LATCH/AUTOR pin
-
-
0.3
V
V
MODEL
input L level
LATCH/AUTOR pin
1.2
-
-
V
V
MODE
H
input H level
LATCH/AUTOR pin
50
100
150
kΩ
R
MODEH
pull-down resistor
[COMP pin characteristics]
COMP pin detection voltage
COMP pin pull-up resistor
External Thermistor resistor
Latch release voltage
（VCC
pin voltage）
Latch mask time
V
COMP
R
COMP
R
T
V
L
ATCHOFF
T
COMP
0.370
19.4
3.32
-
70
0.500
25.9
3.70
V
UVLO2
-0.5
150
0.630
32.3
4.08
-
240
V
kΩ
kΩ
V
us
Datasheet
Conditions
PFC = ON
PFC = OFF
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/47
TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003
BM1050AF-G
●Electrical
Characteristics (Unless otherwise noted Ta=25, VH_IN=320Vdc, VCC=12V)
Specifications
Parameter
Symbol
Unit
Minimum
Standard Maximum
[Quasi-resonant Control Block]
[Quasi-resonant DC/DC converter Block (turn off)]
QR_FB pin pull-up resistance
CS over-current
detect voltage 1A
CS over-current
detect voltage 1B
CS over-current
detect voltage 1C
CS over-current
detect voltage 1D
CS over-current
detect voltage 2A
CS switched ZT current
CS Leading
Edge Blanking time
Turn off time
Minimum ON width
Maximum operating
frequency 1
Maximum operating
frequency 2
Frequency reduction
start FB voltage
Frequency reduction
end FB voltage
Voltage gain
R
FB
V
lim1A
V
lim1B
V
lim1C
V
lim1D
V
lim2A
I
ZT
T
LEB
T
OFF
T
min
15
0.950
0.630
-
-
-
0.800
-
-
-
20
1.000
0.700
0.250
0.750
0.150
1.000
0.250
0.250
0.500
25
1.050
0.770
-
-
-
1.200
-
-
-
kΩ
V
V
V
V
V
mA
us
us
us
*1
T
LEB
＋T
OFF
I
zt
<1.0mA
I
zt
>1.0mA
I
zt
<1.0mA
I
zt
<1.0mA
Datasheet
Conditions
QR_FB=0.3V (I
zt
<1.0mA)
[Quasi-resonant DC/DC converter Block (turn on)]
F
SW1
F
SW2
V
FBSW1
V
FBSW2
AV
CS
106
24
1.15
0.35
1.70
120
30
1.250
0.50
2.00
134
36
1.350
0.65
2.30
140
500
-
1.40
5.40
3.1
-
3.9
-
110
84
3.8
KHz
KHz
V
V
V/V
mV
mV
us
ms
ms
V
V
V
V
kΩ
ms
V
⊿V
(QR_FB)/⊿V
（QR_CS）
QR_ZT drop
QR_ZT rise
Count from final ZT trigger
QR_FB=2.00V
QR_FB=0.50V
ZT comparator voltage 1
V
ZT1
60
100
ZT comparator voltage 2
V
ZT2
300
400
ZT trigger timeout period
T
ZTOUT
-
15
[Quasi-resonant DC/DC converter protection functions]
Soft start time1
T
SS1
0.60
1.00
Soft start time2
T
SS2
2.60
4.00
FB OLP Voltage 1a
V
FOLP1A
2.5
2.8
FB OLP Voltage 1b
V
FOLP1B
-
2.6
FB OLP Voltage 2a
FB OLP Voltage 2b
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
V
FOLP2A
V
FOLP2B
R
FOLP2
T
FOLP
V
ZTL
3.3
-
90
44
3.2
3.6
3.4
100
64
3.5
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)
R
POUT
R
NOUT
5
2
15
5
30
10
Ω
Ω
R
MASK
-
150
-
Ω
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TSZ22111・15・001
5/47
TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003
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