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LM25010 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 LM25010
상세설명  42V, 1.0A Step-Down Switching Regulator
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제조업체  TI1 [Texas Instruments]
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Current Limit
Threshold
Io
Normal Operation
Current Limited
Low Load Current
High Load Current
'I
IOCL
IPK
LM25010
www.ti.com
SNVS419C – DECEMBER 2005 – REVISED DECEMBER 2008
Figure 4. Inductor Current - Current Limit Operation
N - Channel Buck Switch and Driver
The LM25010 integrates an N-Channel buck switch and associated floating high voltage gate driver. The peak
current through the buck switch should not exceed 2A, and the load current should not exceed 1.5A. The gate
driver circuit is powered by the external bootstrap capacitor between BST and SW (C4), which is recharged each
off-time from VCC through the internal high voltage diode. The minimum off-time, nominally 260 ns, ensures
sufficient time during each cycle to recharge the bootstrap capacitor. A 0.022 µF ceramic capacitor is
recommended for C4.
Soft-Start
The soft-start feature allows the regulator to gradually reach a steady state operating point, thereby reducing
startup stresses and current surges. At turn-on, while VCC is below the under-voltage threshold (t1 in Figure 1),
the SS pin is internally grounded, and VOUT is held at 0V. When VCC exceeds the under-voltage threshold
(UVLO) an internal 11.5 µA current source charges the external capacitor (C6) at the SS pin to 2.5V (t2 in
Figure 1). The increasing SS voltage at the non-inverting input of the regulation comparator gradually increases
the output voltage from zero to the desired value. The soft-start feature keeps the load inductor current from
reaching the current limit threshold during start-up, thereby reducing inrush currents.
An internal switch grounds the SS pin if VCC is below the under-voltage lock-out threshold, or if the circuit is
shutdown using the RON/SD pin.
Thermal Shutdown
The LM25010 should be operated below the Maximum Operating Junction Temperature rating. If the junction
temperature increases during a fault or abnormal operating condition, the internal Thermal Shutdown circuit
activates typically at 175°C. The Thermal Shutdown circuit reduces power dissipation by disabling the buck
switch and the on-timer. This feature helps prevent catastrophic failures from accidental device overheating.
When the junction temperature reduces below approximately 155°C (20°C typical hysteresis), normal operation
resumes.
Applications Information
EXTERNAL COMPONENTS
The procedure for calculating the external components is illustrated with a design example. Referring to the
Block Diagram, the circuit is to be configured for the following specifications:
VOUT = 5V
VIN = 6V to 40V
FS = 175 kHz
Minimum load current = 200 mA
Maximum load current = 1.0A
Softstart time = 5 ms.
R1 and R2: These resistors set the output voltage, and their ratio is calculated from:
Copyright © 2005–2008, Texas Instruments Incorporated
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