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BM1R00012F Schematic ( PDF Datasheet ) - ROHM Semiconductor

Teilenummer BM1R00012F
Beschreibung CCM corresponding Secondary Side Synchronous Rectification Controller IC
Hersteller ROHM Semiconductor
Logo ROHM Semiconductor Logo 




Gesamt 26 Seiten
BM1R00012F Datasheet, Funktion
Datasheet
Low Consumption and High Accuracy Shunt Regulator Built-in
High Efficiency and Low Standby Power,
CCM corresponding
Secondary Side Synchronous Rectification
Controller IC
BM1R00xxxF
General Description
BM1R00xxxF is a synchronous rectification controller
to be used in the secondary-side output. It has a
built-in ultra-low consumption and high accuracy shunt
regulator, which significantly reduces standby power.
The shunt regulator is constructed in a completely
independent chip that enables it to operate as a GND
reference even when used in high side.
At continuous mode operation, further space saving
can be realized when operating without the input
switching synchronizing signal of the primary side.
Key Specifications
Input Voltage Range: 2.7V to 32V
Circuit Current (No Switching):
800µA(Typ)
Circuit Current (Auto Shutdown) : 120µA (Typ)
DRAIN Terminal Absolute Voltage:
120V
Operating Temperature Range: -40°C to +105°C
Package
W(Typ) x D(Typ) x H(Max)
5.00mm x 6.20mm x 1.71mm
BM1R00xxxF also features a wide operating power
supply voltage range of 2.7V to 32V for various output
applications.
Finally, by adopting the high-voltage 120V process, it
is possible to monitor the drain voltage directly.
Features
Built-in Ultra-Low Consumption Shunt Regulator
Reducing Standby Power Consumption
Synchronous Rectification FET Supports
High and Low Side
120V High Voltage Process DRAIN terminal
Wide Input Operating Voltage Range of
2.7V to 32V
Supports LLC and PWM QR Controller
No Input Required on the Primary-Side at CCM
Built-in Overvoltage Protection for SH_IN and
SH_OUT Terminal
Built-in Thermal Shutdown Function
Built-in Auto Shutdown Function
SOP8 package
Applications
AC-DC Output Power Conversion Applications:
Charger, Adapter, TV, Rice Cooker, Humidifier,
Air Conditioning, Vacuum Cleaner, etc.
SOP8
Lineup Table
Latch Protection Series
Auto Restart Protection Series
Function Name
BM1R00001
BM1R00002
BM1R00003
BM1R00004
BM1R00005
BM1R00006
BM1R00007
BM1R00008
BM1R00009
BM1R00010
BM1R00011
BM1R00012
BM1R00013
BM1R00014
BM1R00015
BM1R00016
BM1R00017
BM1R00018
BM1R00019
BM1R00020
BM1R00021
BM1R00022
BM1R00023
BM1R00024
BM1R00025
BM1R00026
BM1R00027
BM1R00028
BM1R00029
BM1R00030
Compulsion
ON Time
( μs)
1
1
1
1
1
1.5
1.5
1.5
1.5
1.5
2.3
2.3
2.3
2.3
2.3
2.8
2.8
2.8
2.8
2.8
3.5
3.5
3.5
3.5
3.5
NONE
NONE
NONE
NONE
NONE
Compulsion
OFF Time
( μs)
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
Function Name
BM1R00121
BM1R00122
BM1R00123
BM1R00124
BM1R00125
BM1R00126
BM1R00127
BM1R00128
BM1R00129
BM1R00130
BM1R00131
BM1R00132
BM1R00133
BM1R00134
BM1R00135
BM1R00136
BM1R00137
BM1R00138
BM1R00139
BM1R00140
BM1R00141
BM1R00142
BM1R00143
BM1R00144
BM1R00145
BM1R00146
BM1R00147
BM1R00148
BM1R00149
BM1R00150
Compulsion
ON Time
( μs)
1
1
1
1
1
1.5
1.5
1.5
1.5
1.5
2.3
2.3
2.3
2.3
2.3
2.8
2.8
2.8
2.8
2.8
3.5
3.5
3.5
3.5
3.5
NONE
NONE
NONE
NONE
NONE
Compulsion
OFF Time
( μs)
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
1.3
2
3
3.6
4.6
Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/22
TSZ02201-0F4F0A2BM1R0-1-2
20. Apr. 2016 Rev.002






BM1R00012F Datasheet, Funktion
BM1R00xxxF
Description of Block continued
5. MAX_TON Block
MAX_TON block sets the maximum ON time. DRAIN terminal voltage starts counting when the rising edge of the
output voltage exceeds VCC × 1.4V (Typ). In addition, the recounting starts when it detects another rising edge. The
synchronous rectification FET will be forced OFF after the set time has elapsed. The time can be adjusted by varying
the resistance value of the resistor connected to the MAX_TON terminal.
The relationship between the resistance value (RMAX_TON) and set time (TMAX_TON) is described as follows:
RMAX _TON  k  tMAX _TON µs10k/ s
Calculation Example:
If you want to set the maximum ON time to 10µs, the value of RMAX_TON is as follows:
10µs 10k/ s100k
However, the formula above is for an ideal approximation only; it is still strongly advised that the operation of the actual
application should still be verified.
By setting this time, it becomes possible to prevent the simultaneous ON operation of the primary side and the
secondary side in continuous mode.
The drive sequence in continuous mode operation is shown in the figure below:
VH Np Ns
I2
I1
VOUT
Vf
+
-
GND
(1)
VG1
(3)
(1)
Primary
Side
Controller
VG1
LFB
RDRAIN2
VG2
RDRAIN1
D1
VDS2
I1
I2
LDO BLOCK
DRAIN_COMP
C1 R1
RMAX_TON
MAX_TON
SR_GND
VCCx1.4
SET_COMP
-100mV
MAX_TON
BLOCK
RESET_COMP
+
-
-6mV
SQ
R
Compulsion
ON TIME
Compulsion
OFF TIME
VDS2
0V
VG2
MAX_TON
TIMER
(2)
VCC x 1.4
-100mV
(4)
tMAX_ON
(5)
-100mV
-Vf
(6)
tMAX_ON
Period allotted for G1 and G2
to avoid concurrent ON state
at continuous mode
operation.
Figure 2. The drive sequence in continuous mode operation
(1) Primary side FET = ON. Current I1 flows to the primary side FET. Secondary side drain voltage VDS2 rises.
(2) The VDS2 = VCC × 1.4 detects the rise edge of the threshold, MAX_TON timer start.
(3) Primary side FET = OFF. Current I2 flows through the Body Diode of the secondary side FET (OFF state).
(4) Secondary side drain voltage VDS2<-100mV by I2 Current, Secondary side FET=ON.
(5) Elapsed the set time in MAX_TON terminals, the secondary-side FET = compulsory OFF.
(6) Since the I2 current flows through the Body Diode, Vf voltage occurs.
a capacitor C1 and a Moreover, in order to reduce as much as possible the influence of the switching noise, resistor R1
in series should be connected to the MAX_TON terminal. The capacitance should approximately be 1000pF, and the
resistance value is recommended to be around 1kΩ.This also serves as phase compensation of MAX_TON terminal
and therefore should be connected.
This function may be disabled by pulling up the MAX_TON terminal to VCC pin in quasi-resonant and current
resonance applications which do not operate on continuous mode. The 1000pF and 1kΩ resistor is also unnecessary.
6. AUTO SHUTDOWN Block
The Auto Shutdown block automatically turns the synchronous rectification ON/OFF depending on the presence or
absence of the DRAIN terminal pulse. Shutdown occurs if the input pulses on the DRAIN terminal has more than 200us
between pulses. This stops the synchronous rectification operation. The IC will restart the synchronous rectification
after it detects 256 occurrences of input pulses on the DRAIN terminal.
7. SHUNT REGULATOR Chip
A high-accuracy shunt regulator with ultra-low consumption is used for controlling the output voltage of the AC/DC.
Since the synchronous rectification and the shunt regulator are built in a completely different chip, GND separation is
possible. Therefore, it becomes possible to place the shunt regulator on the secondary-side GND reference in the
synchronous rectification applications in case of disposing the High Side FET. It can also be used as protection for the
comparator, the secondary side OVP, FET overheat protection, etc.
8. PROTECTION Block
When an abnormal condition is detected after the timer count is completed, the photo coupler from SH_OUT terminal is
driven to stop the switching operation on the primary side.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/22
TSZ02201-0F4F0A2BM1R0-1-2
20. Apr. 2016 Rev.002

6 Page









BM1R00012F pdf, datenblatt
BM1R00xxxF
Typical Performance Curves - continued
5000
4000
3000
2000
Ta=105°C
V
Ta=25°C
Ta=-40°C
1000
0
740
760 780 800 820 840
SH_SIHN_VINoltVaogleta:gVeSVHS_HIN_I[Nm[VV]]
860
Figure 11. SH_OUT Current vs SH_IN Voltage
(VSH_OUT=5V)
300
250
200 Ta=105°C
V
150
100
Ta=-40°C
50
Ta=25°C
0
760
780 800 820
SH_SINH_VIoNltaVgoelta: gVeSHV_SINH_[ImN V[V]]
840
Figure 12. SH_OUT Current vs SH_IN Voltage
(VSH_OUT=5V, ZOOM UP)
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/22
TSZ02201-0F4F0A2BM1R0-1-2
20. Apr. 2016 Rev.002

12 Page





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