Datasheet
AC/DC Convertor IC
Non-isolated Type PWM DC/DC Converter IC
Built-in Switching MOSFET
BM2Pxx1X-Z Series (Include under Development Item)
General Description
The PWM type DC/DC converter for AC/DC provides
an optimum system for all products that include an
electrical outlet. It enables simpler design of a high
effective converter specializing in non-isolation.
By a built-in startup circuit that tolerates 650 V, this IC
contributes to low power consumption. A current
detection resistor as internal device realizes the small
power supply designs. Since a current mode control is
utilized, the current can be restricted in each cycle and
an excellent performance is demonstrated in the
bandwidth and transient response. The switching
frequency is fixed to 65 kHz. A frequency hopping
function is also on chip, and it contributes to low EMI. In
addition, a built-in super junction MOSFET which
tolerates 650 V makes the design easy.
Key Specifications
Power Supply Voltage Range
DRAIN Pin:
650 V (Max)
Current at Switching Operation:
850 µA (Typ)
Current at Burst Operation:
450 µA (Typ)
Switching Frequency:
65 kHz (Typ)
Operation Temperature Range: -40 °C to +105 °C
MOSFET ON Resistor:
1.5 Ω (Typ)
Package
DIP7K
W (Typ) x D (Typ) x H (Max)
9.27 mm x 6.35 mm x 8.63 mm
pitch 2.54 mm
Features
PWM Current Mode Method
Frequency Hopping Function
Burst Operation at Light Load
Built-in 650 V Startup Circuit
Built-in 650 V Super Junction MOSFET
VCC UVLO (Under Voltage Lockout)
VCC OVP (Over Voltage Protection)
Over Current Detection Function per Cycle
Soft Start Function
Applications
Household Appliances such
Air-conditioners and Cleaners
as
LED
Lights,
Lineup
Product Name
BM2P101X-Z (under Development)
BM2P121X-Z
BM2P131X-Z (under Development)
BM2P141X-Z
BM2P151X-Z
BM2P161X-Z (under Development)
BM2P181X-Z (under Development)
BM2P201X-Z (under Development)
BM2P241X-Z (under Development)
VCC Control Voltage
10.00 V
12.00 V
13.00 V
14.00 V
15.00 V
16.80 V
18.00 V
20.00 V
24.80 V
Typical Application Circuit
VCC
GND_IC
VOUT
DRAIN
AC
Input
Filter
DRAIN
GND
〇Product
structure : Silicon integrated circuit
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© 2018 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This
product has no designed protection against radioactive rays
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BM2Pxx1X-Z Series (Include under Development Item)
Pin Configuration
(TOP VIEW)
N.C.
DRAIN
N.C.
DRAIN
GND_IC
N.C.
VCC
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
Pin Name
N.C.
N.C.
GND_IC
N.C.
VCC
DRAIN
DRAIN
I/O
-
-
I/O
-
I
I/O
I/O
Function
Non connection
Non connection
GND pin
Non connection
Power supply input pin
MOSFET DRAIN pin
MOSFET DRAIN pin
ESD Diode
VCC
GND_IC
-
-
-
-
✔
-
-
-
-
✔
-
✔
-
✔
Block Diagram
VCC
5
DRAIN
Starter
6, 7
Thermal
Pro tection
+
-
+
-
VCC UVLO
VCC OVP
100 μs
Filte r
Inte rnal
Regula tor
Internal Block
OLP
+
-
64 ms
/512 ms
Timer
Burst
Comparator
-
+
Sup er Jun ction
MOSFET
S
R
Q
DRIVER
+
-
Reference
Voltage
PWM
Comparator
-
+
PWM
Control
Log ic
and
Timer
+
-
Dynamic Current
Limitter
+
-
Reference
Voltage
Current
Limitter
Reference
Voltage
Lea ding-Edg e
Blan kin g Time
Soft Start
Curren t
Sen sin g
Maximu m
Duty
OSC
Freque ncy
Hoppin g
GND_IC
3
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BM2Pxx1X-Z Series (Include under Development Item)
Description of Blocks
1
Back Converter
This is the IC for exclusive use of non-isolated type back converter.
Basic operation of back converter is shown below.
1.1
When the Switching MOSFET is ON
Current I
L
flows to coil L and energy is stored when the MOSFET turns ON. At this moment, the GND_IC pin
voltage becomes near the DRAIN pin voltage, and the diode D1 is OFF.
=
(
−
)
×
[A]
Where:
is the current flowing to the coil.
is the voltage applied to the DRAIN pin.
is the output voltage.
is the value of coil.
is the term that the MOSFET is on.
5 VCC
4
GND_IC
3
VOUT
Current
I
L
ON
6
DRAIN
2
1
DRAIN
AC
Input
Filter
7
GND
Figure 1. Back Converter Operation (MOSFET = ON)
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BM2Pxx1X-Z Series (Include under Development Item)
1
Back Converter – continued
1.2
When the Switching MOSFET is OFF
The energy stored in the coil is output via the diode when the MOSFET turns OFF.
=
×
[A]
Where:
is the current flowing to the coil.
is the output voltage.
is the value of coil.
is the term that the MOSFET is off.
5 VCC
4
GND_IC
3
VOUT
I
L
OFF
6
DRAIN
2
1
DRAIN
AC
Input
Filter
7
Current
GND
Figure 2. Back Converter Operation (MOSFET = OFF)
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BM2Pxx1X-Z Series (Include under Development Item)
Description of Blocks – continued
2
Startup Sequences
Startup sequences are shown in Figure 3. See the sections below for detailed descriptions.
Voltage between
DRAIN pin and GND
(Note 1)
V
CN T
V
UVL O1
V
CH G2
V
CH G1
V
UVL O2
Voltage between
VCC pin and GND_IC pin
t
FOLP1
Voltage between
VOUT and GND
(Note 1)
FB OLP status
which i s se t
Normal
Load
Light
Load
Burst
mode
Overload
t
FOLP2
Overload
I
OUT
t
FOLP1
t
FOLP1
Switching
A
(Note 1)
B
C
D
E
F
G
H I
J
K
This GND does n ot mean th e G ND_IC pin of the IC.
Figure 3. Startup Sequences Timing Chart
A:
B:
The input voltage is applied to the DRAIN pin and the VCC pin voltage rises.
If the VCC pin voltage exceeds V
UVLO1
, the IC starts to operate. And if the IC judges the other protection functions
as normal condition, it starts the switching operation. The soft start function limits the over current detection voltage
to prevent any excessive voltage or current rising. When the switching operation starts, the output voltage rises.
C: Until the output voltage becomes a constant value or more from startup, the VCC pin voltage drops by the VCC pin
current consumption.
D: After the switching operation starts, it is necessary that the output voltage is set to become the rated voltage within
t
FOLP1
.
E: At light load, the IC starts the burst operation to restrict the power consumption.
F: When the load exceeds a certain electric power, the IC starts the overload operation.
G: If the overload status which is set lasts for t
FOLP1
, the switching operation is turned off.
H: When the VCC pin voltage becomes less than V
CHG1
, the VCC recharge function operates.
I: When the VCC pin voltage becomes more than V
CHG2
, the recharge function stops operating.
J: After t
FOLP2
period from G, the switching operation starts.
K: Same as G.
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