Texas Instruments TLV62090EVM-125 Evaluation Module TLV62090EVM-125 TLV62090EVM-125 데이터 시트
제품 코드
TLV62090EVM-125
Introduction
1
Introduction
The TLV62090 device family is a high-frequency, synchronous, step-down converter optimized for small
solution size, high efficiency, and is suitable for battery-powered applications. To maximize efficiency, the
converter operates in PWM mode with a nominal switching frequency of 1.4 MHz and automatically enters
Power Save Mode operation at light-load currents. When used in distributed power supplies and point-of-
load regulation, the device allows voltage tracking to other voltage rails and tolerates capacitors ranging
from 22 µF up to 100 µF. Using the DCS Control™ topology, the device achieves excellent load transient
performance and accurate output voltage regulation. The device is available in 3 x 3-mm, 16-pin package
with thermal pad.
solution size, high efficiency, and is suitable for battery-powered applications. To maximize efficiency, the
converter operates in PWM mode with a nominal switching frequency of 1.4 MHz and automatically enters
Power Save Mode operation at light-load currents. When used in distributed power supplies and point-of-
load regulation, the device allows voltage tracking to other voltage rails and tolerates capacitors ranging
from 22 µF up to 100 µF. Using the DCS Control™ topology, the device achieves excellent load transient
performance and accurate output voltage regulation. The device is available in 3 x 3-mm, 16-pin package
with thermal pad.
2
Considerations When Evaluating theTLV62090
The TLV62090 integrated circuit (IC) has a two-stage, input current limit that sets the initial current limit to
one third (~1.55 A) of the normal peak current limit of approximately 4.6 A, when the output is less than
0.6 V. Most system loads do not become enabled or active until the output has reached 0.8 V, which is
after the initial start-up current limit. If a low-resistance load is used (less than approximately 1
one third (~1.55 A) of the normal peak current limit of approximately 4.6 A, when the output is less than
0.6 V. Most system loads do not become enabled or active until the output has reached 0.8 V, which is
after the initial start-up current limit. If a low-resistance load is used (less than approximately 1
Ω
), the part
may get stuck in short-circuit mode during power up. Thus, very heavy loads may have to be applied after
power up or the user can place an N-CH logic level FET in series with the resistor (drain connected to
ground side of resistor, source connected to ground and gate tied to the drain). Once the output reaches
approximately 1 V, the load turns on.
power up or the user can place an N-CH logic level FET in series with the resistor (drain connected to
ground side of resistor, source connected to ground and gate tied to the drain). Once the output reaches
approximately 1 V, the load turns on.
3
Test Summary
The TLV62090EVM-125 board requires an adjustable dc power supply with up to a 6-V output and
≥
2.5 A
for powering the input to the EVM and a resistive output load between 1 k
Ω
and 0.6
Ω
. Choose the proper
power rating for the load resistor, P = V
2
/ R. Use at least 2x the calculated power dissipation. The test
setup connections and jumper settings selections are configured for a stand-alone evaluation, but can be
changed to interface with external hardware such as a system load and microcontroller.
changed to interface with external hardware such as a system load and microcontroller.
3.1
Equipment
•
Adjustable dc power supply between 2.5 V and 6 V with adjustable current limit set to approximately
2.5 A
2.5 A
•
Load: System load, resistive load of 2
Ω
, 3 W and 25
Ω
•
Three Fluke 75 digital multimeters (DMM); (equivalent or better)
•
Oscilloscope, model TDS222 (equivalent or better)
3.2
Equipment and EVM Setup
shows the setup input/output connections and configuration of the TLV62090 evaluation module.
The silk screen labels appear in parentheses.
Table 1. Setup I/O Connections and Configuration for TLV62090EVM
Jack/Component (Silk Screen)
Connect or Adjustment to:
J1-1/2 (Vin)
P/S positive lead, preset to 4.5 Vdc; 2.5A Current Limit
J2-1 (+ SNS)
Input positive lead of DMM #1
J2-2 (– SNS)
Input negative lead of DMM #1
J3-1/2 (GND)
P/S negative lead.
J5-1/2 (Vout)
Positive lead to system load or load resistance
J6-1 (+ SNS)
Output positive lead of DMM #2
J6-2 (– SNS)
Output negative lead of DMM #2
J7-1/2 (GND)
Negative lead to system load or load resistance
J4-1 (PG)
Positive lead of DMM #3
J4-2 (GND)
Negative lead of DMM #3
JP1-1/2 (ON)
Apply shunt to ON for converter operation
JP1-2/3 (OFF)
2
TLV62090EVM-125 Evaluation Module
SLVU693B – March 2012 – Revised May 2012
Copyright © 2012, Texas Instruments Incorporated