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PDF BM1C001F Data sheet ( Hoja de datos )
| Número de pieza | BM1C001F | |
| Descripción | AC/DC Drivers Power Factor Correction | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
AC/DC Drivers
Power Factor Correction and
Quasi-Resonant DC/DC converter IC
BM1C001F
General Description
The compounded LSI of the Power Factor Correction (PFC)
converter and Quasi-Resonant (QR) controller type AC/DC
converter IC provides an optimum system for all products that
include an electrical outlet. BM1C001F has a built in HV
starter circuit that tolerates 650V and contributes to low power
consumption and high speed start.
The PFC part is a Boundary Conduction Mode (BCM). It
reduces the switching loss and the switching noise. This IC
has adopted the voltage control mode, a solution that
achieves no auxiliary winding and reduces external parts and
the bias current.
The DC/DC part is Quasi-Resonant controlled. This control
enables soft switching and helps to keep the EMI low. With
MOSFET for switching and current detection resistors as
external devices, a higher degree of design freedom is
achieved.
This IC has over voltage protection for the PFC’s output
terminal, which protects electrolytic capacitors by stopping
switching and makes the standby power consumption low by
the PFC ON/OFF control function. The IC includes various
protective functions such as VCC over voltage protection,
external latch protection, brown out protection, soft start
function, per-cycle current limiter and over load protection.
PFC Output level setting function
PFC ON/OFF level setting
QR low power when load is light (Burst operation) and
frequency decrease function
QR maximum frequency control (120kHz)
QR_CS pin open protection and OCP function
QR Over-Current Protection with AC compensation
QR Soft Start function
QR secondary side protection circuit of over-current
QR_ZT pin 2 step timeout function and OVP function
Applications
AC adapters and Household appliances (Printer, TV,
Vacuum cleaners, Air cleaners, Air conditioners, IH cooking
heaters, Rice cookers, etc.).
Key Specifications
Operating Power Supply:
Voltage Range:
Operating Current:
Max frequency:
The range of temperature:
VCC
VH_IN
Normal
Burst
PFC
QR
8.9V to 26.0V
80V to 600V
1.2mA (Typ)
0.6mA (Typ)
400kHz (Max)
120kHz (Typ)
-40°C to +85°C
Features
PFC+QR Combo IC
Built-in 650V tolerance start circuit
VCC pin: under and over voltage protection
Brown out function
External latch terminal function
PFC boundary current mode (voltage control)
PFC Zero Cross Detection
PFC variable max frequency (up to 400kHz)
PFC Dynamic & Static OVP function
Package W(Typ) x D(Typ) x H(Max)
SOP18 11.20mm × 7.80mm × 2.01mm pitch 1.27mm
SOP18
Typical Application Circuit
AC
85V-a2c65
FUSE
Filter
Diode
Bridge
P_IS
18
VH_IN
QR_OUT
17 16 15 14
(N.C.) P_TIMERQR_OUT P_OUT
P_IS
13
P_IS
P_VS VCC
QR_ZT
SBD
QR_CS
12
QR_CS
P_VS
11
P_VS
QR_OUT
10
P_OVP
QR_CS
Csw
RS
BM1C001F
QR_FB
PC
15.0V 5.0A
ERAMROPR
VCC GND QR_FB QR_ZT COMP P_EO BR P_RT P_OFFSET
12 34567 89
BR
VCC QR_FB QR_ZT
BR
PC CPU
Figure 1. Application circuit
Product structure Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/32
TSZ02201-0F1F0A200010-1-2
29.Aug.2013 Rev.002
http://www.Datasheet4U.com
1 page  
BM1C001F
Datasheet
(2) Start-Up Sequence
(Soft Start Operation, Light Load Operation, Over Load Operation, Auto Recovery Operation)
The start up sequence is showed at Figure 7; the DC/DC part operates first, followed by the PFC part.
A: Input voltage VH_IN is applied.
B: Charge current flows from start circuit to the VCC pin capacitor. Then VCC pin voltage rises.
C: Monitor the AC voltage by BR pin. And confirm normal state by releasing brown out (BR pin>1.0V).
D: When VUVLO1 (typ.13.5V) < VCC pin, UVLO is released and this IC operates.
E: After rising, the internal regulator, DC/DC part, starts operation, and then VOUT voltage rises. When the DC/DC starts, the
DC/DC output voltage is set to be the specified voltage to until tFOLP (typ.256ms).
[QR Start-Up Operation]
F: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 1 against over voltage and current
rising. This term continues for tss1 (typ.0.5ms). This IC operates the state until maximum power of QR is 12%.
G: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 2 against over voltage and current
rising. This term continues for tss2 (typ.1.0ms). This IC operates the state until maximum power of QR is 25%.
H: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 3 against over voltage and current
rising. This term continues for tss2 (typ.2.0ms). This IC operates the state until maximum power of QR is 50%.
I: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 4 against over voltage and current
rising. This term continues for tss2 (typ.4.0ms). This IC operates the state until maximum power of QR is 75%.
J: If secondary voltage is value is set, the QR_FB voltage value corresponding to load current from photo coupler is constant. At
normal state, QR_FB voltage is QR_FB<VFBOLP1B (typ.2.60V).
[PFC Start-Up Operation]
K: At the point in J or after the QR Soft-start ends (4ms≤), This IC recognizes that the DC/DC part operation is normal, the PFC
part starts operation.
L: If P_VS pin voltage is greater than VP_SHORT (typ.0.3V), the IC judges that short detection is normal.
M: To prevent an excessive current rise and excessive voltage rise in the PFC part, P_VS voltage rises from 0V. At this time,
PFC’s DUTY increase from 0% with P_EO voltage increasing. When P_VS>2.25V, the output voltage rise is slow, Then,
P_VS is stable with voltage of 1.625V (ACIN L) or (ACIN H) 2.5V by the input state of the BR pin.
VH_IN
VCC
VUVLO1(typ=13.5V)
[VCCUVLO]
BR
OK
[BrounOut]
[QR_OK]
DCDC
VO(QR)
QR_FB
OK
250usec
0.5ms0.5ms1.0ms
12% 25% 50%
2.0ms
75%
OK
Output Setting Voltage
VFOLP(typ=2.6V)
Normal Operation
PFC_OK
VO(PFC)
P_VS
AB C
OK
Output Setting Voltage
P_VS=2.25V
VP_SHORT typ=0.30V
D E FG
H
IJ
KL
Figure 7. Start-up Sequence Timing Chart
M
VSAMP (typ=2.50V)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/32
TSZ02201-0F1F0A200010-1-2
29.Aug.2013 Rev.002
http://www.Datasheet4U.com
5 Page 
BM1C001F
Datasheet
(6-1) Determination of ON width (Turn OFF)
ON width is controlled by QR_FB and QR_CS. The IC decides ON width by comparison between the value which divide
QR_FB pin by Vcs (typ=4) voltage and QR_CS pin voltage. Besides, by comparison with Vlim1(typ.0.5V)voltage which is
generated in IC, QR_CS comparator level is changed linearly to be shown in Figure 17.
QR_CS is shared with over-current limiter circuit per pulse.
IC changes over-current limiter level and max frequency by QR_ FB voltage.
mode1: Burst operation
mode2: Frequency reduction operation (reduce max frequency)
mode3: Max frequency operation
mode4: Over load operation (To detect over load state, IC stops switching)
MAX Fsw [kHz]
120kHz
mode1
mode2
mode3
mode4
40kHz
0.0V 0.5V
CS Limiter [V] mode1
Vlim1
mode2
1.25V
2.0V
mode3
2.8V QR_FB [V]
mode4
Vlim2
0.0V 0.5V
1.25V
2.0V
2.8V QR_FB [V]
Figure 17. QR_FB Pin Voltage – Over-Current Limiter, Max Frequency Characteristics
To adjust over-current limiter level, CS Over-Current Protection voltage is switched in soft-start, AC voltage.
Vlim1 and Vlim2 are changed below.
Table 2. Over-Current Protection Voltage Detail
Soft Start
AC=100V
Vlim1
Vlim2
Vlim1
AC=240V
Vlim2
Start to 0.5ms
0.063V ( 12%)
0.016V ( 3%)
0.044V (10%)
0.011V ( 2%)
0.5ms to 1ms
0.125V ( 25%)
0.032V ( 6%)
0.088V (20%)
0.022V ( 4%)
1ms to 2ms
0.250V ( 50%)
0.063V (12%)
0.175V (40%)
0.044V ( 9%)
2ms to 4ms
0.375V ( 75%)
0.094V (19%)
0.263V (60%)
0.066V (13%)
4ms ≤
0.500V (100%)
0.125V (25%)
0.350V (70%)
0.087V (18%)
* ( percent) is shown comparative value with Vlim1(typ =0.5V)in normal operation.
The reason that distinguish between AC100V and AC230V is by CS over-current protection voltage switch function which is shown
to(6-3).
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/32
TSZ02201-0F1F0A200010-1-2
29.Aug.2013 Rev.002
http://www.Datasheet4U.com
11 Page | ||
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| PDF Descargar | [ Datasheet BM1C001F.PDF ] | |
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