VER1.5
Qualification of BRNS/BRFS/BRDS series
(Point of Load applications)
to Intermediate Bus Architecture
→ Page BRNS
→ Page BRFS/BRDS
→ Page BRFS/BRDS
→ Page CHS and BR
Applications Manual
1. Pin configuration
BRNS 1-1
2. Mounting and storage
BRNS 2-1
Mounting
BRNS 2-1
Automatic mounting
BRNS 2-2
Soldering
BRNS 2-2
Stencil Openings
BRNS 2-3
Cleaning
BRNS 2-4
Storage
BRNS 2-4
Safety considerations
BRNS 2-4
3. Connection and wiring
BRNS 3-1
Connection for standard use
BRNS 3-1
Wiring input pin
BRNS 3-2
Wiring output pin
BRNS 3-4
4. Applications data
BRNS 4-1
Efficiency
BRNS 4-1
Dynamic load response
BRNS 4-3
Ripple voltage
BRNS 4-7
Rise time
BRNS 4-8
Derating
BRNS 4-9
5. Adjustable voltage range
BRNS 5-1
6. Protect circuitry
BRNS 6-1
Overcurrent protection
BRNS 6-1
7. Remote ON/OFF
BRNS 7-1
8. Remote sensing
BRNS 8-1
When the remote sensing function is not use
BRNS 8-1
When the remote sensing function is use
BRNS 8-1
9. Power good
BRNS 9-1
10. Sequence
BRNS 10-1
11. Frequency synchronization
BRNS 11-1
12. Series Operation / Parallel operation
BRNS 12-1
Series operation
BRNS 12-1
Parallel operation / Redundant operation
BRNS 12-1
13. Package information
BRNS 13-1
2.7
2.4
2.6
2.5
BRNS series
Page
2.2
2.3
2.1
3.1
4.1
3.3
12.2
4.2
8.2
4.5
12.1
3.2
8.1
6.1
4.3
4.4
Fig. 1.1
Pin connection
for BRNS
(bottom view)
Table 1.1
Pin connection and
function of BRNS
(a) BRNS6/12 (b) BRNS20
BRNS 1-1
2.1
Pin configuration
1. Pin configuration
Applications manual
For BRNS series
2.1 Mounting
■
The unit can be mounted in any direction. When two or more power supplies are used side
by side, position them with proper intervals to allow enough air ventilation. The temperature
around each power supply should not exceed the temperature range shown in derating
curve.
■
Avoid placing the DC input line pattern layout underneath the unit, it will increase the line
conducted noise. Make sure to leave an ample distance between the line pattern layout and
the unit. Also avoid placing the DC output line pattern underneath the unit because it may
increase the output noise. Lay out the pattern away from the unit.
■
Avoid placing the signal line pattern layout underneath the unit, this power supply might
become unstable.
Lay out the pattern away from the unit.
■
Avoid placing pattern layout in hatched area in Fig.2.1.1 to insulate between pattern and
power supply.
Fig. 2.1.1
Prohibition area of
Pattern layout(top view)
(a)BRNS6/12
(b)BRNS20
BRNS 2-1
2.1
Pin configuration
2. Mounting and storage
Applications manual
For BRNS series
2.2 Automatic Mounting
■
To mount BRNS series automatically, use the coil area near the center of the PCB as
an adsorption point. Please see Fig.2.2.1 for details of the adsorption point.
Fig. 2.2.1
Adsorption area
2.3 Soldering
■
Fig.2.3.1 shows condition for reflow of BRNS series. Please make sure that the temperature
of board’s pattern near by +VOUT and GND terminal.
■
While soldering, having vibration or impact on the unit should be avoided, because of
solder melting.
■
Please do not do the implementation except the reflow.
■
Because some parts drops, please do not do reflow of the back side.
Fig. 2.3.1
Recommended reflow
soldering condition
(a) BRNS6/12 (b) BRNS20
BRNS 2-2
Applications manual
For BRNS series
2.4 Stencil Openings
■
Recommended size for stencil openings is shown in Fig.2.4.1.
Fig. 2.4.1
Recommended size
for stencil openings
(Top view)
Dimensions in mm , [ ] = inches
Recommended stencil thickness is 0.12mm
BRNS 2-3
(a) BRNS6 / 12
(b) BRNS20
Applications manual
For BRNS series
2.5 Cleaning
■
When cleaning is necessary, clean under the following conditions.
Method
: Varnishing, ultrasonic wave and vapor
Cleaning agents
: IPA (Solvent type)
Total time
: 2 minutes or less
■
Do not apply pressure to the lead and name plate with a brush or scratch it during the
cleaning.
■
After cleaning, dry them enough.
2.6 Storage
■
To stock unpacked products in your inventory, it is recommended to keep them under
controlled condition, 5-30
℃
, 60%RH and use them within a year.
■
24-hour baking is recommended at 125
℃
, if unpacked products were kept under
uncontrolled condition, which is 30
℃
, 60%RH or higher.
Original reels are not heat-resistant. Please move them to heatresistant trays in preparation
to bake.
To check moisture condition in the pack, Silica gel packet has some moisture condition
Indicator particles. Indicated blue means good. Pink means alarm to bake it.
■
The reels will be deformed and the power supply might be damaged, if the vacuum pressure
is too much to reseal.
2.7 Safety Consideration
■
To apply for safety standard approval using this power supply, the following conditions
must be met.
●
This unit must be used as a component of the end-use equipment.
●
Safety approved fuse must be externally installed on input side.
BRNS 2-4
Applications manual
For BRNS series
3.1 Connection for standard use
■
In order to use power supply, it is necessary to wire as shown in Fig. 3.1.1.
Fig. 3.1.1
Connection for
standard use
■
Short the following pins to turn on the power supply.
GND
⇔
RC, +VOUT
⇔
+S, GND
⇔
-S (-S : only BRNS20)
■
Connect resistance to set the output voltage between TRM and GND.
■
Between input and output is not isolated .
■
The BRNS series handle only the DC input.
Avoid applying AC input directly.
It will damaged the power supply.
BRNS 3-1
2.1
Pin configuration
3. Connection and wiring
Applications manual
For BRNS series
3.2 Wiring input pin
(1) External fuse
■
Fuse is not built-in on input side. In order to protect the unit, install the normal-blow
type fuse on input side.
■
When the input voltage from a front end unit is supplied to multiple units, install the
normal-blow type fuse in each unit.
■
When the fuse is open, power good signal is not outputted.
■
It is not necessary to use fuse if it can be protected by the overcurrent protection
function of bus converter on the input side.
Table 3.2.1
Recommended
fuse
(2) External capacitor on the input side
■
Install an external capacitor Ci, between +VIN and GND input pins for low line-noise
and for stable operation of the power supply.
Table 3.2.2
Recommended
external input capacitor
(Ceramic)
■
Ci is within 5mm for pins. Make sure that ripple current of Ci is less than its rating.
■
When an impedance and inductance level of the input line become higher, the input
voltage may become unstable. In that case, the input voltage becomes stable by
increasing Ci.
(3) Recommendation for noise-filter
■
Install an external input filter as shown in Fig.3.2.1 in order to reduce conducted noise.
Ci is shown in Table 3.2.2.
Fig. 3.2.1
Example of
recommended external
input filter
BRNS 3-2
Applications manual
For BRNS series
(4) Reverse input voltage protection
■
Avoid the reverse polarity input voltage. It will damage the power supply.
It is possible to protect the unit from the reverse input voltage by installing an external
diode as shown in Fig.3.2.2.
Fig. 3.2.2
Reverse input voltage
protection
BRNS 3-3
Applications manual
For BRNS series
3.3 Wiring output pin
■
When the BRNS series supplies the pulse current for the pulse load, please install a
capacitor Co between +VOUT and GND pins.
Fig. 3.3.1
Wiring external
output capacitor
Table 3.3.1
Recommended
Co and MaxCo
■
The output ripple voltage may grow big by resonance with Co and ESL of the wiring,
if resonance frequency and switching frequency are close.
■
Ripple and Ripple Noise are measured, as shown in the Fig.3.3.2. Cin is shown in
Table 3.2.2. Co1 and Co2 is shown in Table 3.3.2.
Fig. 3.3.2
Measuring method of
Ripple and Ripple Noise
Table 3.3.2
Co1 and Co2
which is used in
measuring
BRNS 3-4
BRNS12 47μFx1+100μFx1 1,000μF
3 BRNS20 100μFx2 1,000μF
No. Recommended Co Max CoModel
1 BRNS6 47μFx1+100μFx1 1,000μF
2
Applications manual
For BRNS series
4.1 Efficiency
Fig. 4.1.1
Efficiency
(BRNS6)
at 25℃
Fig. 4.1.2
Efficiency
(BRNS12)
at 25℃
Vout = 1.2V Vout = 3.3V
Vout = 5.0V
Vout = 1.2V Vout = 3.3V
BRNS 4-1
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 2 4 6
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 2 4 6
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 2 4 6
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 4 8 12
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 4 8 12
2.1
Pin configuration
4. Applications data
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
6.5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Applications manual
For BRNS series
Fig. 4.1.3
Efficiency
(BRNS20)
at 25℃
Vout = 5.0V
BRNS 4-2
Vout = 1.2V Vout = 3.3V
Vout = 5.0V
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 4 8 12
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 5 10 15 20
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 5 10 15 20
Efficiency [%]
Load Current [A]
60
68
76
84
92
100
0 5 10 15 20
Input Volt.
Input Volt.
Input Volt. 14.4V
6.5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
5V
12V
Input Volt.
Input Volt.
Input Volt. 14.4V
6.5V
12V
Applications manual
For BRNS series
4.2 Dynamic Load Response
4.2.1 BRNS6
Fig. 4.2.1.1
Dynamic Load
Response
BRNS 4-3
100 μs/div
100 μs/div
100 μs/div
100 μs/div
100 mV/div
100 mV/div
Vin 12V, Vout 1.2V, Cin 22μF×2, Cout 1000μF
Testing Circuitry Fig .4.2.3.2
←
Load 50% (3A)
→
Load 0% (0A)
←
Load 100% (6A)
→
Load 50% (3A)
Cycle
Load Current
5 m t1,t2=50 μs
t1
t2
s
Applications manual
For BRNS series
4.2.2 BRNS12
Fig. 4.2.2.1
Dynamic Load
Response
BRNS 4-4
100 μs/div
100 μs/div 100 μs/div
100 μs/div
Cycle
Load Current
5 m t1,t2=50 μs
t1 t2
Vin 12V, Vout 1.2V, Cin 22μF×2, Cout 1000μF
Testing Circuitry Fig. 4.2.3.2
100 mV/div
100 mV/div
Load
50% ( 6 A) ←
Load 100% (12A)
→
s
←
→
Load 50% (6A)
Load 0% (0A)
Applications manual
For BRNS series
4.2.3 BRNS20
Fig. 4.2.3.1
Dynamic Load
Response
BRNS 4-5
100 μs/div
100 μs/div 100 μs/div
100 μs/div
Cycle
Load Current
5 m t1,t2=50 μs
t1 t2
Vin 12V, Vout 1.2V, Cin 22μF×3, Cout 1000μF
Testing Circuitry Fig. 4.2.3.2
100 mV/div
100 mV/div
Load
50% (10 A) ←
Load 100% (20A)
→
s
←
Load 50% (10A)
→
Load 0% (0A)
Applications manual
For BRNS series
Fig. 4.2.3.2
Measuring method
of Dynamic Load
Response
BRNS 4-6
Load
25mm
Cout2
+VIN
+VOUT
GND
DC
Input
Cin
+S
3mm
Cout1
Cin
22μF×2
22μF×2
22μF×33 BRNS20 100μF 900μF
No.
1
2
Model Cout1 Cout2
BRNS6
BRNS12 100μF 900μF
100μF 900μF
Oscilloscope
Bw:20MHz
Applications manual
For BRNS series
4.3 Ripple Voltage
Fig. 4.3.1
Ripple Voltage
of BRNS at 25℃
Fig. 4.3.2
Measuring method
of Ripple Voltage
BRNS 4-7
(a) BRNS6
1 μs/div
5 mV/div
Vin 12V Vout1.2V
Load Current 6A
1 μs/div
5 mV/div
(b) BRNS12
Vin 12V Vout1.2V
Load Current 20A
(ｃ) BRNS20
Vin 12V Vout1.2V
Load Current 12A
Oscilloscope
Bw:20MHz
R
C
R=50Ω
C=0.01uF
1.5m 50Ω
Coaxial cable
Load
25mm
Cout2
3mm
Cout1
+VIN
+VOUT
GND
DC
Input
Cin
+S
-S
900μF3 BRNS20 22μF×3 100μF
47μF 900μF
2 BRNS12 22μF×2 47μF 900μF
No. Model Cin Cout1 Cout2
1 BRNS6 22μF×2
1 μs/div
10 mV/div
100
100
100
Applications manual
For BRNS series
4.4 Rise time
Load current:0A, Cin:22μF×2, Cout:47μF+100μF
Fig. 4.4.1
BRNS6
Rise at 25℃
200mV/div 2V/div
5ms/div 5ms/div
Rise time: 3.3ms
Rise time: 3.8ms
Vin:8V, Vout:0.6V
Vin:12V, Vout:5.5V
Fig. 4.4.2
Load current:0A, Cin:22μF
×2, Cout:100
μF+47μF
BRNS12
Rise at 25℃
200mV/div 2V/div
5ms/div 5ms/div
Rise time: 3.5ms
Rise time: 3.8ms
Vin:8V, Vout:0.6V
Vin:12V, Vout:5.5V
Fig. 4.4.3
Load current:0A, Cin:22μF
×3, Cout:100
μF+100μF
BRNS20
Rise at 25℃
200mV/div 2V/div
5ms/div 5ms/div
Rise time: 3.3ms
Rise time: 3.5ms
Vin:8V, Vout:0.6V
Vin:12V, Vout:5.5V
BRNS 4-8
Applications manual
For BRNS series
4.5 Derating
■
Shows the temperature measurement points in Figure 4.5.2 and Figure 4.5.3.
That the temperature of the specified point be less than or equal to the temperature
shown in FIG. 1.Ambient temperature must be maintained at 85
℃
or less.
Fig. 4.5.1
Derating curve
for BRNS
Fig. 4.5.2
Temperature
measurement
location for BRNS6/12
Fig. 4.5.3
Temperature
measurement
location for BRNS20
BRNS 4-9
Applications manual
For BRNS series
■
Fig.4.5.5 ~ 4.5.13 show the derating curve in the condition that is measured
as shown in Fig.4.5.4.
Verify final design by actual temperature measurement.
The temperature measurement location as shown in Fig.4.5.2 and Fig.4.5.3
must keep below 120
℃.
Fig. 4.5.4
Measuring method
Fig. 4.5.5
Derating curve
for BRNS6
at 12Vin 1.2Vout
Fig. 4.5.6
Derating curve
for BRNS6
at 12Vin 3.3Vout
BRNS 4-10
12.7mm
76mm
25.4mm
BRNS20
PWB
Measurement point for
ambient temperature
and airflow
Airflow
Airflow
BRNS6/12
Airflow
A
B
0
4
3
2
1
40 60 80
Ambient temperature [℃]
-40 -20 0 20
6
Load current [A]
5
①
②
①
1m/s
②
2m/s
0
6
5
4
3
Load current [A]
2
1
40 60 80
Ambient temperature [℃]
-40 -20 0 20
①
②
①
1m/s
②
2m/s
BRNS
Applications manual
For BRNS series
Fig. 4.5.7
Derating curve
for BRNS6
at 12Vin 5.5Vout
Fig. 4.5.8
Derating curve
for BRNS12
at 12Vin 1.2Vout
Fig. 4.5.9
Derating curve
for BRNS12
at 12Vin 3.3Vout
Fig. 4.5.10
Derating curve
for BRNS12
at 12Vin 5.5Vout
BRNS 4-11
0
6
5
4
Load current [A]
3
2
1
40 60 80
Ambient temperature [℃]
-40 -20 0 20
①
②
①
1m/s
②
2m/s
0
40 60 80
Ambient temperature [℃]
-40 -20 0 20
Load current [A]
12
10
8
6
4
2
①
②
①
1m/s
②
2m/s
0
40 60 80
Ambient temperature [℃]
-40 -20 0 20
Load current [A]
12
10
8
6
4
2
①
②
①
1m/s
②
2m/s
0
40 60 80
Ambient temperature [℃]
-40 -20 0 20
Load current [A]
12
10
8
6
4
2
①
②
①
1m/s
②
2m/s
Applications manual
For BRNS series
Fig. 4.5.11
Derating curve
for BRNS20
at 12Vin 1.2Vout
Fig. 4.5.12
Derating curve
for BRNS20
at 12Vin 3.3Vout
Fig. 4.5.13
Derating curve
for BRNS20
at 12Vin 5.5Vout
BRNS 4-12
0
20
16
12
8
4
Load current [A]
-40
Ambient temperature [℃]
-20 0 20 40 60 80
①
1m/s
②
2m/s
① ②
0
40 60 80
Ambient temperature [℃]
Load current [A]
20
16
12
8
4
-40 -20 0 20
①
1m/s
②
2m/s
① ②
0
40 60 80
Ambient temperature [℃]
-40 -20 0 20
12
8
4
Load current [A]
20
16
①
1m/s
②
2m/s
①
②
Applications manual
For BRNS series
■
Output voltage is adjustable by the external resistor.
■
The temperature coefficient could become worse, depending on the type of a resistor.
Resistor
・・・・
Metal film type, coefficient of less than ±100ppm/
℃
■
When TRM is opened, output voltage is 0.6V.
■
R
TRM
is calculated in the following expressions.
Fig. 5.1.1
Calculation result
Fig. 5.1.2
Connecting R
TRM
R
TRM
=
12
[kΩ]
VOUT - 0.6
BRNS 5-1
2.1
Pin configuration
5. Adjustable voltage range
Applications manual
For BRNS series
■
Please use the output voltage in the operating area of Fig.5.1.3.
Transient response may worsen when used in vicinity of the border of the operating area.
Only for output voltage is rising and output current is small, there is a possibility
that the ripple voltage is high value. If the ripple voltage value is problem, connecting
a capacitor of Table 3.3.1 value.
Fig. 5.1.3
Operating area
of BRNS series
■
When start of DC INPUT is slow, BRNS may start on the outside of the operating area.
By the circuitry of the Fig.5.1.4, you can raise the start-up voltage.
Fig. 5.1.4
RC circuitry for start up
BRNS 5-2
Applications manual
For BRNS series
6.1 Overcurrent Protection
■
Over Current Protection (OCP) is built-in and works at 105% of the rated current or higher.
However, use in an overcurrent situation must be avoided whenever possible.
The output voltage of the power module will recover automatically when the fault causing
overcurrent is corrected.
When the output voltage drops after OCP works, the power module enters a ”hiccup mode”
where it repeatedly turns on and off at a certain frequency(5ms typ).
BRNS 6-1
2.1 Pin configuration
6. Protect circuit
Applications manual
For BRNS series
■
The remote ON/OFF function is incorporate in the input circuitry and operated with RC and GND.
If positive logic control is required , order the power supply with "-R" option.
■
When remote on/off function is not used, please open RC.
Table. 7.1.1
Specification of
Remote ON/OFF
Fig. 7.1.1
Internal circuitrys of
Remote ON/OFF
Fig. 7.1.2
RC connection
example
ON/OFF
logic
Between RC and GND
Output
voltage
Optional -R Positive
L level (-0.2-0.3V) or short OFF
H level (3.0-VIN) or open ON
Standard Negative
L level (-0.2-0.3V) or short or open ON
H level (3.0-VIN) OFF
BRNS 7-1
2.1
Pin configuration
7. Remote ON/OFF
Control
Circuit
22K
22K
RC
GND
+Vin
External
Circuit
Applications manual
For BRNS series
8.1 When the remote sensing function is not use
Fig. 8.1.1
Connection
when the remote
sensing is not in use
■
When the remote sensing function is not in use, it is necessary to confirm that pins
are shorted between +S & +VOUT and between -S & GND.
■
Wire between +S & +VOUT and between -S & GND as short as possible.
Loop wiring should be avoided.
This power supply might become unstable by the noise coming from poor wiring.
8.2 When the remote sensing function is use
Fig. 8.2.1
Connection
when the remote
sensing is in use
■
Twisted-pair wire or shield wire should be used for sensing wire.
■
Thick wire should be used for wiring between the power supply and a load.
Line drop should be less than 0.5V.
Voltage between +VOUT and GND should remain within the output voltage
adjustment range.
■
If the sensing patterns are short, heavy-current is drawn and the pattern may
be damaged.
The pattern disconnection can be prevented by installing the protection parts
as close as possible to a load.
BRNS 8-1
2.1
Pin configuration
8. Remote sensing
Applications manual
For BRNS series
■
By using PGOOD, it is possible to monitor power supply whether normal
operation or abnormal operation.
■
PGOOD terminal inside is comprised of at open drain.
Sink current of PGOOD is 50μA.
■
Voltage of PGOOD pin become low when over current protection circuitry is work,
or output voltage is different from a set point more than ±10%.
Fig. 9.1.1
Internal circuitry of
PGood
Fig.9.1.2
BRNS6
RC(5V/div) Vin:12V t0: 5ms(Max)
PGOOD
Vout:5.5V
Vout(2V/div) load current:0A
PGOOD(2V/div) Cin:22uFx2
Cout：100uF+47uF
5ms/div
Fig.9.1.3
BRNS12
RC(5V/div) Vin:12V t0: 5ms(Max)
PGOOD
Vout:5.5V
load current:0A
Vout(2V/div) Cin:22uFx2
PGOOD(2V/div)
Cout：100uF+47uF
5ms/div
Fig.9.1.4
Vin:12V t0: 5.0ms(Max)
BRNS20
RC(5V/div) Vout:5.5V
PGOOD
load current:0A
Cin:22uFx3
Vout(2V/div)
Cout：100uF×2
PGOOD(2V/div)
5ms/div
BRNS 9-1
9.Power Good
t0
t0
t0
Applications manual
For BRNS series
■
The adjustment of the rise time is possible by connecting C
ＳＥＱ
.
C
SEQ
[nF] = 6×T
RISE
[ms] - 15
■
C
SEQ
should be less than 1.0μF.
■
At the time of start, the output voltage follows the SEQ voltage.
Output voltage and SEQ voltage are expressed in the following calculation.
BRNS 10-1
10. Sequence
Applications manual
For BRNS series
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