Texas Instruments Evaluation Board for the LM5035C LM5035CEVAL/NOPB LM5035CEVAL/NOPB データシート
製品コード
LM5035CEVAL/NOPB
LM5035C
UVLO
AGND
PGND
COMP
HO
LO
SS
RT
RAMP
VIN
VIN
VOUT
OVP
SR1
SR2
ERROR AMP AND
ISOLATION
Digital
Isolator
Powering and Loading Considerations
Feedback from the output is processed by an amplifier and reference, generating an error voltage, which
is coupled back to the primary side control through an optocoupler. The COMP input to the LM5035C
greatly increases the achievable loop bandwidth. The capacitance effect (and associated pole) of the
optocoupler is reduced by holding the voltage across the optocoupler constant. The LM5035C voltage
mode controller pulse width modulates the error signal with a ramp signal derived from the line voltage
(feedforwarding) to reduce the response time to input voltage changes. A standard “type III” network is
used for the compensator.
is coupled back to the primary side control through an optocoupler. The COMP input to the LM5035C
greatly increases the achievable loop bandwidth. The capacitance effect (and associated pole) of the
optocoupler is reduced by holding the voltage across the optocoupler constant. The LM5035C voltage
mode controller pulse width modulates the error signal with a ramp signal derived from the line voltage
(feedforwarding) to reduce the response time to input voltage changes. A standard “type III” network is
used for the compensator.
The evaluation board can be synchronized to an external clock with a recommended frequency range of
420KHz to 500KHz.
420KHz to 500KHz.
Figure 1. Simplified Half Bridge Converter
3
Powering and Loading Considerations
When applying power to the LM5035C evaluation board, certain precautions need to be followed. A
misconnection can damage the assembly.
misconnection can damage the assembly.
4
Proper Connections
When operated at low input voltages, the evaluation board can draw up to 3.5A of current at full load. The
maximum rated output current is 30A. Be sure to choose the correct connector and wire size when
attaching the source supply and the load. Monitor the current into and out of the evaluation board. Monitor
the voltage directly at the output terminals of the evaluation board. The voltage drop across the load
connecting wires will cause inaccurate measurements. This is especially true for accurate efficiency
measurements.
maximum rated output current is 30A. Be sure to choose the correct connector and wire size when
attaching the source supply and the load. Monitor the current into and out of the evaluation board. Monitor
the voltage directly at the output terminals of the evaluation board. The voltage drop across the load
connecting wires will cause inaccurate measurements. This is especially true for accurate efficiency
measurements.
2
AN-2043 LM5035C Evaluation Board
SNVA433A – March 2010 – Revised May 2013
Copyright © 2010–2013, Texas Instruments Incorporated