Texas Instruments LM5157EVM-BST, Руководство пользователя

Страница: 4 / 24

1.2 Configuration Points
Table 1-2 indicates the available test points and configuration jumpers. These points offer flexibility in configuring
the evaluation module and include but not limited to:
• BIAS pin to be connected to the following:
– External supply (VAUX)
– Input voltage (VIN)
– Regulated output voltage (VOUT)
– VCC pin
• PGOOD pin to be supplied by either VCC or VAUX
• External clock synchronization
• Shut-down signal by pulling the SD pin high
• Four different operation modes to enable and disable the spread spectrum and hiccup mode
Table 1-2. Jumper Description
JUMPER PIN DESCRIPTION
TP1 VIN+ Positive input voltage sense connection
TP2 SW Probe point for the switch node of the LM5157 boost circuit
TP3 VOUT+ Positive output voltage sense connection
TP4 GND Negative input voltage sense connection
TP5 GND Negative output voltage sense connection
TP6 SYNC
Input for external clock signal. To implement the external clock synchronization, remove the
jumper resistor R10 and tie the external signal to the TP6 (SYNC).
TP7 VAUX Supply the BIAS pin from an external supply (if J9 is connected).
TP8 VOUT+ Loop response positive injection point (bottom side)
TP9 UVLO Middle point of UVLO resistor divider
TP10 VOUT– Loop response negative injection point (bottom side)
TP11 SD High signal pulls the UVLO pin to ground entering shutdown mode
TP12 AGND Negative input of external signals
J6
Pin 1 to pin 2
Connect VOUT to the BIAS pin of the LM5157 through D2 (only set one jumper to J6, J7, J8, or
J9).
Pin 2 to pin 3 Directly connect VOUT to the BIAS pin of the LM5157 (only set one jumper to J6, J7, J8, or J9).
J7
Pin 1 to pin 2 Connect VIN to the BIAS pin of the LM5157 through D3 (only set one jumper to J6, J7, J8, or J9).
Pin 2 to pin 3 Directly connect VIN to BIAS pin of the LM5157 (only set one jumper to J6, J7, J8, or J9).
J8 Pin 1 to pin 2 Directly connect VCC to the BIAS pin (only set one jumper to J6, J7, J8 or J9).
J9 Pin 1 to pin 2 Directly connect VAUX to the BIAS pin (only set one jumper to J6, J7, J8, or J9).
J10
SS (Pin 1) Monitor the SS pin.
COMP (Pin 2) Monitor the COMP pin.
AGND (Pin 3) Connection to AGND plane
SYNC (Pin 4) Monitor the EN/UVLO/SYNC pin.
PGOOD (Pin 5) Monitor the PGOOD pin.
BIAS-IC (Pin 6) Monitor the BIAS pin.
VCC (Pin 7) Monitor the VCC pin.
J11 (only use
one jumper on
J11)
Pin 1 to pin 2 (NN) Hiccup mode disabled, spread spectrum disabled
Pin 3 to pin 4 (HS) Hiccup mode enabled, spread spectrum enabled
Pin 5 to pin 6 (HN) Hiccup mode enabled, spread spectrum disabled
Pin 7 to pin 8 (NS) Hiccup mode disabled, spread spectrum enabled
Features and Electrical Performance www.ti.com
4 LM5157EVM-BST Evaluation Module SNVU739A – OCTOBER 2020 – REVISED AUGUST 2021
Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated