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
FUSE
AC
85-265
Vac
Filter
Diode
Bridge
P_IS
QR_OUT
QR_OUT
P_IS
QR_CS
P_VS
P_VS
VCC
QR_ZT
SBD
15.0V 5.0A
Csw
QR_CS
18
VH_IN
17
16
15
14
13
P_IS
12
QR_CS
11
P_VS
10
P_OVP
(N.C.) P_TIMER QR_OUT P_OUT
RS
ERROR
AMP
QR_FB
BM1C001F
VCC
GND
QR_FB
QR_ZT
COMP
P_EO
BR
P_RT P_OFFSET
PC
1
BR
VCC
2
3
QR_FB
4
QR_ZT
5
6
7
BR
8
9
PC
CPU
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 has no designed protection against radioactive rays
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BM1C001F
Pin Configuration
Datasheet
Figure 2. Pin Layout (Top View)
Pin Description
Table 1. I/O Pin Functions
Pin Name
VCC
GND
QR_FB
QR_ZT
COMP
P_EO
BR
P_RT
P_OFFSET
P_OVP
P_VS
QR_CS
P_IS
P_OUT
QR_OUT
P_TIMER
N.C.
VH_IN
I/O
I/O
I/O
I
I
I
O
I
I
I
I
I
I
I
O
O
I
-
I
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Function
[General] Power supply pin
[General] GND pin
[ QR ] Feedback detection pin
[ QR ] Zero cross detection pin
[General] External latch input pin
[PFC] Error amplifier output pin
[General] Input AC voltage monitor pin
[PFC] Max frequency setting pin
[PFC] ON/OFF setting voltage
[PFC] Over voltage detection pin
[PFC] Feedback signal input pin
[ QR ] Over-current detection pin
[PFC] Zero cross detection pin
[PFC] External MOS drive pin
[ QR ] External MOS drive pin
[PFC] OFF time setting pin
-
[General] Starter circuit pin
ESD Diode
VCC GND
-
○
○
-
-
○
-
○
-
○
-
○
-
○
-
○
-
○
-
○
-
○
-
○
-
○
○
○
○
○
-
○
-
-
○
-
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BM1C001F
Block Diagram
Datasheet
Figure 3. Block Diagram
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BM1C001F
Description of Blocks
(1) Starter Block (VH_IN Pin)
Datasheet
The built-in starter circuit tolerates 650V and enables low standby mode current consumption and high speed starting.
After starting, current consumption is idle I
START3
(typ=10uA).
This function is shown in Figure 4 and Figure 5. To supply electric power from AC supply to VHIN, rectification is inputed
from both ends of AC waveform to VHIN for stable works (Refer to Figure6).
ISTART2
ISTART1
ISTART3
0 Vsc
10V
VCC Voltage [V]
V
UVLO
1
Figure 4. Starter Circuit Block Diagram
Figure 5. Start-up Current vs VCC Voltage
In addition, VH_IN pin has a Cap discharge function. (Refer to Figure 6). If the input voltage of the BR pin goes below 1.0V,
discharge starts after waiting 256ms. (However during Light load mode, the OLP state of the secondary side output, if there is
no power supply from the auxiliary winding, when the IC is in recharge operation, discharge begins after removing the AC
outlet without waiting for the timer (256ms), with the current consumption of the internal circuitry of the IC. (Path: Figure 6 (a)))
Figure 6. Starter Circuit Block Diagram
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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 V
UVLO1
(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 t
FOLP
(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 t
ss1
(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 t
ss2
(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 t
ss2
(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 t
ss2
(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<V
FBOLP1B
(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 V
P_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
V
UVLO1
(typ=13.5V)
VCC
[VCCUVLO]
BR
[BrounOut]
[QR_OK]
DCDC
VO(QR)
QR_FB
PFC_OK
OK
OK
250usec
0.5ms
1.0ms
0.5ms
12% 25%
50%
2.0ms
75%
OK
Normal Operation
Output Setting Voltage
V
FOLP
(typ=2.6V)
OK
Output Setting Voltage
VO(PFC)
P_VS=2.25V
P_VS
AB C
D
E
F G
H
I
J
K
L
V
P_SHORT
typ=0.30V
V
SAMP
(typ=2.50V)
M
Figure 7.
Start-up Sequence Timing Chart
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微控制器 MCU
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