controller circuit in position P2 is 110 °C, but at worst case
operation the temperature is approximately 10 °C higher at
position P1. At light load the temperature is approximately the
same in position P1 and P2. This means the OTP threshold
and hysteresis will be lower at light load conditions when P1 is
used as a reference for OTP.
Products with P2 as reference OTP:
When T
P2
as defined in thermal consideration section exceeds
120 °C the product will shut down. For products with P2 as a
reference for OTP the configured default value in the controller
circuit in position P2 is 120 °C.
The OTP threshold, hysteresis, and fault response of the
product can be reconfigured using the PMBus interface. The
fault response can be configured as follows:
1. Initiate a shutdown and attempt to restart an infinite number
of times with a preset delay period between attempts
(default configuration).
2. Initiate a shutdown and attempt to restart a preset number
of times with a preset delay period between attempts.
3. Continue operating for a given delay period, followed by
shutdown if the fault still exists.
4. Continue operating through the fault (this could result in
permanent damage to the power supply).
5. Initiate an immediate shutdown.
Optimization examples
This product is designed with a digital control circuit. The
control circuit uses a configuration file which determines the
functionality and performance of the product. It is possible to
change the configuration file to optimize certain performance
characteristics. In the table below is a schematic view on how
to change different configuration parameters in order to
achieve an optimization towards a wanted performance.
↑
Increase
→
No change
↓
Decrease
Config.
parameters
Switching
frequency
Control
loop
bandwidth
NLR
threshold
Diode
emulation
(DCM)
Min.
pulse
Optimized
performance
Maximize
efficiency
↓
→
↑
Enable
Disable
Minimize
ripple ampl.
↑
→
↑
Enable
or
disable
Enable
or
disable
Improve
load
transient
response
↑
↑
↓
Disable
Disable
Minimize
idle power
loss
↓
↑
→
Enable
Enable
Note 1: The following table, graphs and waveforms are only examples
and valid for BMR 464 2008.
Note 2: In the following table and graphs, the worst-case scenario
(load step 37.5-12.5 A) has been considered for load transient
.
P
li
Input idling
power
(no load)
Default
configuration:
Continues
Conduction
Mode, CCM
V
O
= 0.6 V
0.95
W
V
O
= 1.0 V
0.95
V
O
= 1.8 V
1.22
V
O
= 3.3 V
1.88
DCM,
Discontinues
Conduction
Mode
(diode
emulation)
V
O
= 0.6 V
0.21
W
V
O
= 1.0 V
0.21
V
O
= 1.8 V
0.21
V
O
= 3.3 V
0.21
DCM with
Minimum
Pulse
Enabled
V
O
= 0.6 V
0.43
W
V
O
= 1.0 V
0.46
V
O
= 1.8 V
0.54
V
O
= 3.3 V
0.67
P
CTRL
Input
standby
power
Turned off
with
CTRL-pin
Default
configuration:
Monitoring
enabled
170
mW
Pulse
monitor
mode:
Monitoring
disabled
109
mW
Low power
mode:
Monitoring
disabled
85
mW
V
tr1
Load
transient
peak
voltage
deviation
Load step
25-75-25%
of max I
O
Default
configuration
di/dt = 2 A/μs
C
O
= 470 μF
V
O
= 0.6 V
300
mV
V
O
= 1.0 V
300
V
O
= 1.8 V
305
V
O
= 3.3 V
315
DLC and
Optimized
NLR
configuration
di/dt = 2 A/μs
C
O
= 470 μF
V
O
= 0.6 V
100
mV
V
O
= 1.0 V
100
V
O
= 1.8 V
100
V
O
= 3.3 V
100
t
tr1
Load
transient
recovery
time
Load step
25-75-25%
of max I
O
Default
configuration
di/dt = 2 A/μs
C
O
=470 μF
V
O
= 0.6 V
100
µs
V
O
= 1.0 V
100
V
O
= 1.8 V
100
V
O
= 3.3 V
100
DLC and
Optimized
NLR
configuration
di/dt = 2 A/μs
C
O
= 470 μF
V
O
= 0.6 V
50
V
O
= 1.0 V
50
V
O
= 1.8 V
50
V
O
= 3.3 V
50
BMR4
6
series
PoL Regulators
Input 4.5-14 V, Output up to 50 A / 165 W
1/28701-BMR 464 Rev.B
July 2019
© Flex
Technical Specification
BMR4
6
series
PoL Regulators
Input
4.5-14
V, Output up to
50
A
/
165
W
1/28701-BMR 464 Rev.B
July 2019
©
Flex
Technical Specification
57
