Document
Datasheet
Quasi-resonant AC/DC Converter Built-in 1700 V SiC-MOSFET
BM2SCQ12xT-LBZ Series
General Description
This is the product guarantees long time support in industrial market. BM2SCQ12xT-LBZ series is a quasi-resonant AC/DC
converter that provides an optimum system for all products which has an electrical outlet. Quasi-resonant operation enables soft switching and helps to keep the EMI low.
This IC can be designed easily because it includes the 1700 V/4 A SiC (Silicon-Carbide) MOSFET. Design with a high degree of flexibility is achieved with current detection resistors as external devices. The burst
operation reduces an input power at light load. BM2SCQ12xT-LBZ series includes various protection functions, such as soft start function, burst operation, over current limiter per cycle, over-voltage protection function, overload protection function.
Key Specifications
Operating Power Supply Voltage Range:
VCC:
15.0 V to 27.5 V
DRAIN:
1700 V (Max)
Normal Operating Current:
2000 µA (Typ)
Burst Operating Current:
500 µA (Typ)
Maximum Operating Frequency: 120 kHz (Typ)
Operating Temperature:
-40 °C to +105 °C
Package TO220-6M
W (Typ) x D (Typ) x H (Max) 10.0 mm x 4.5 mm x 25.6 mm
Features
Long Time Support Product for Industrial Applications 6 Pins: TO220-6M Package Built-in 1700 V/4 A/1.12 Ω SiC-MOSFET
Quasi-resonant Type (Low EMI) Frequency Reduction Function Low Current Consumption (19 µA) during Standby Burst Operation at Light Load
SOURCE Pin Leading Edge Blanking VCC UVLO (Under Voltage Lockout protection) VCC OVP (Over Voltage Protection) Over Current Protection Circuit per Cycle Soft Start Function
ZT Pin Trigger Mask Function ZT OVP (Over Voltage Protection)
Applications
Power Supply for Industrial Equipment, AC Adaptor, Household Appliances
Lineup Product name
BM2SCQ121T-LBZ BM2SCQ122T-LBZ BM2SCQ123T-LBZ BM2SCQ124T-LBZ
FB OLP Auto Restart Latch Auto Restart Latch
VCC OVP Latch Latch Auto Restart Auto Restart
Typical Application Circuit
FUSE
Filt er
Diode Bridge
DRAI N
SOURCE FB GND ZT VCC
ERROR AMP
Product structure :Silicon and silicon carbide integrated circuit .www.rohm.com © 2018 ROHM Co., Ltd. All rights reserved. TSZ22111 • 14 • 001
This product has no designed protection against radioactive rays
1/30
TSZ02201-0F1F0A200470-1-2 03.Dec.2019 Rev.003
BM2SCQ12xT-LBZ Series
Pin Configuration
(TOP VIEW)
DRAIN 1
SOURCE FB GND ZT VCC 2 345 6
Pin Description
Pin No.
1 2 3 4 5 6
Pin Name
DRAIN SOURCE
FB GND ZT VCC
I/O Function
I/O MOSFET DRAIN pin I MOSFET SOURCE pin I Feedback signal input pin
I/O GND pin I Zero current detection pin I Power supply input pin
ESD Diode
VCC
GND
-✔
✔✔
✔✔
✔-
-✔
-✔
www.rohm.com © 2018 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001
2/30
TSZ02201-0F1F0A200470-1-2 03.Dec.2019 Rev.003
BM2SCQ12xT-LBZ Series
Block Diagram
FUSE
Filter
Diode Bridge
RSTA RT CVCC
VH VOUT Va
6 VCC
1 DRAIN
NOUT
VCC UVLO + -
18.5 V/14.0 V
4.0 V
Regulator Internal Supply
18.0 V Clamper
+
- ZT ACSNS Comp.
+
-
SiC1-M70O0SVFETRZT1
+
- ZT OVP Comp. (LATCH)
28.0 V
VCC OVP
OSC OSC
ZT 5
ZT Comp.
+
1 shot
- AND
OR
Time Out
CZT
RZT2
7 V ( 45 µs ) ZT
200 mV
Blanking
AND
SQ
POUT
OUT(H->L) 0.60 µs
NOUT
OR
FBOLP_OH AND
PRE Driver
OUT
Maximum
VREF(4 V)
+ + -
Blanking Frequency (120 kHz)
R NOUT
FB 3
20 kΩ
1.00 V
Burst Comp.
+ -
CFB 0.50 V OL P
+ Timer FBOLP_OH - (128 ms)
ERROR AMP
200 kΩ 200 kΩ
DCDC
FB/2
Comp. -
1.00 V -
+
Soft Start
CURRENT SENSE (V-V Change) Normal: x 1.0
Leading Edge Blanking
4 GND
SOURCE 2
RS
PC
www.rohm.com © 2018 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001
3/30
TSZ02201-0F1F0A200470-1-2 03.Dec.2019 Rev.003
BM2SCQ12xT-LBZ Series
Description of Blocks
1 Startup Sequences (FB OLP: Auto Recovery Mode) The BM2SCQ12xT-LBZ’s startup sequence is shown in Figure 1. See the sections below for the detailed descriptions.
Input Voltage
VH
VCC Pin Voltage
VFLOP1 VFLOP2
FB Pin Voltage
VOUT
IOUT
Switching
19.5 V
Internal REF Pull Up
128 ms
14.0 V 128 ms
Normal Load
Light Load
Over Load
Burst Mode
Soft Start
A
BC D
E
F GH
128 ms
Time IJ K
Figure 1. Startup Sequence Timing Chart
A: The input voltage VH is applied. B: The VCC pin voltage rises due to start resistor RSTART, and this IC starts operating when the VCC pin voltage
becomes higher than VUVLO1 (Typ = 19.5 V). When the protection functions are judged as normal status, the switching operation starts. At that time, since the VCC pin voltage value always drops due to the pin's consumption current, it is necessary to set the VCC pin voltage to higher than VUVLO2 (Typ = 14.0 V). C: The IC has a soft start function which regulates the voltage level at the SOURCE pin to prevent an excessive rise in voltage and current. D: When the switching operation starts, VOUT rises. At startup, .