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Original question:

UCC27714: UCC27714 schematic verification

LM2904: LM2904BQDRQ1

Khageswara rao Matta
Prodigy 20 points
Part Number: LM2904
Other Parts Discussed in Thread: UCC28180, UCC27511

Dear Ti Team,

De are working on 750W charger for 2-wheeler application and we are using few Texas instruments active parts i.e. UCC27714DR, UCC27511, UCC28180, ISO7220ADRG4, INA180A4IDBVT, UCC24624DR and LM2904BQDRQ1, etc. and we have prepared the schematic and we are requesting you to verify the attached schematic before proceeding to hardware section.

Please do support us.

Note (750W charger Flow):  Single phase AC mains >> Bridge rectifier >> PFC >> LLC converter >> Battery.

Labelling information in the schematic : --

1. VIN_RECT+ : Positive Rectified output terminal from bridge rectifier.

2. VIN_RECT-  : Negative Rectified output terminal from bridge rectifier.

3. +VH_BUS    : Positive output terminal from PFC output or Input to the LLC resonant converter.

4. BAT+            : Positive output terminal from LLC converter or charger.

5. BAT-             : Negative output terminal from LLC converter or charger.

6. PWM_HIGH & PWM_LOW                     : PWM signals of the primary H-bridge side in LLC converter which are coming from the microcontroller.

7. SR_PWM_A & SR_PWM_B                    : PWM signals of the secondary Synchronous rectifier in LLC converter which are coming from the microcontroller.

8. PWM_EN , SR_PWM_EN & PFC_EN    : PWM enable signals coming from the microcontroller i.e. for H-bridge of LLC, Synchronous rectifier of LLC & for PFC controller.

9. CS_LLC & CS_VOUT                             : Primary and secondary current sensing voltage of LLC converter respectively.

10. VIN_AC                                                 : AC rms input voltage 

11. VINAC_SENSE, V_BUS_SENSE & V_OUT_SENSE : AC input voltage, output voltage sensing of PFC & LLC output voltage after signal conditioning whose are going to microcontroller.

  • 0
    TI__Guru*** 146316 points

    Hello Khageswara,

    For the LM290B circuits;

    The voltage senses will detect the presence of the input signal but not its value. I assume this is the goal.

    For the VIN_VAC input, the positive portion of the input will work as expected. The negative input potion should not be detected because the BAT54S diode should keep the negative voltage low enough to prevent phase reversal. At room temperature, the non inverting input will phase reverse (invert) near -0.58V. 

    The NTC "18 AWG" circuit is wired as a comparator with a lot of hysteresis. Was still supposed to be a linear amplifier? If yes, then the inputs are swapped.