Texas Instruments 5A SIMPLE SWITCHER® Power Module with 36V Maximum Input Voltage Evaluation Board LMZ23605EVAL/NOPB LMZ23605EVAL/NOPB 数据表
产品代码
LMZ23605EVAL/NOPB
100 mV/Div
500 µs/Div
2A/Div
2A/Div
100 mV/Div
500 µs/Div
Notes
LMZ23605 Load Step Response V
IN
= 12V
LMZ23603 Load Step Response V
IN
= 12V
V
OUT
= 3.3V, 0.5A to 5A Step
V
OUT
= 3.3V, 0.5A to 3A Step
LMZ23605 Start-up
LMZ23605 Pre-biased startup
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Notes
Solder turrets are located on the edge of the PCB assembly for evaluation hookup to bench test
equipment. The Enable input turret is designed for direct connection to the V
equipment. The Enable input turret is designed for direct connection to the V
IN
turret. There is a resistive
divider implemented on the board that establishes the 5.5V precision UVLO level of the board. A common
user change to this divider is to raise the value of R
user change to this divider is to raise the value of R
ENT
to increase the operating UVLO to that of the target
application. Refer to the respective data sheet for calculation. Note that if in the end application the
module pin 3 enable voltage does not exceed 5.5V at maximum Vin, then enable clamp zener D1 can be
omitted.
module pin 3 enable voltage does not exceed 5.5V at maximum Vin, then enable clamp zener D1 can be
omitted.
Each implementation of the evaluation board is preset to 3.3V output; with current rating and maximum
input voltage rating dictated by the model of module installed. A common user change is to adjust the
output voltage for different requirements. A table of suggested resistor pairs are listed in
input voltage rating dictated by the model of module installed. A common user change is to adjust the
output voltage for different requirements. A table of suggested resistor pairs are listed in
for quick
reference.
Locations are provide for testing the operation as a coincident turn-on tracking supply (slave). To
implement this feature, remove C
implement this feature, remove C
SS
and install Rtkt and Rtkb. Calculations are suggested in the respective
data sheets.
A turret is also provided for applying a clock to synchronize the module switching frequency anywhere
between 650 kHz and 950 kHz. Note that a sustained “logic one” on this input corresponds to “zero hertz”
and will cause the module to stop switching.
between 650 kHz and 950 kHz. Note that a sustained “logic one” on this input corresponds to “zero hertz”
and will cause the module to stop switching.
J1 and J2 are for input and output noise measurement. To implement this feature, populate the 1uF
blocking capacitors and the 49.9 ohm source resistors. Install Amphenol coax connectors type 112404
(Digikey #ACX1051).The added R-C network forms a 2X scope probe when used in conjunction with an
input termination of 50 ohms at the oscilloscope, providing 5 times more sensitivity than a conventional
10x probe.
blocking capacitors and the 49.9 ohm source resistors. Install Amphenol coax connectors type 112404
(Digikey #ACX1051).The added R-C network forms a 2X scope probe when used in conjunction with an
input termination of 50 ohms at the oscilloscope, providing 5 times more sensitivity than a conventional
10x probe.
J3 is for connection to a frequency response analyzer such as A/P Instruments (Ridley) or Venable
Industries products. Refer to the FRA operating manual for this connection. Note: Do not place any type of
shorting jumper to these three posts as that will cause a malfunction.
Industries products. Refer to the FRA operating manual for this connection. Note: Do not place any type of
shorting jumper to these three posts as that will cause a malfunction.
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AN-2085 LMZ23605/03, LMZ22005/03 Evaluation Board
SNVA457B – March 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated