參數(shù)資料
型號(hào)： TPS65162RGZR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC48
封裝： 7 X 7 MM, PLASTIC, VQFN-48
文件頁(yè)數(shù)： 10/36頁(yè)
文件大?。?/td> 1034K
代理商： TPS65162RGZR
Soft Start
Overvoltage Protection
Short CIrcuit Protection
Input Capacitor Selection (VIN, SUP)
Frequency Select Pin, FREQ
SLVS771B – MAY 2007 – REVISED JUNE 2008 ............................................................................................................................................................... www.ti.com
To minimize inrush current during startup, the boost converter has an adjustable soft-start, and the
input-to-output isolation switch has current-limit control. The current limit of the input-to-output isolation switch is
slowly ramped up for a soft turn-on. The VDS sensor of the input-to-output isolation switch monitors the voltage
difference between SWI and SWO, and controls the current through the isolation switch. With VDS = 12 V, the
current-limit threshold through the isolation switch is typically 330 mA. This current-limit threshold will linearly
increase by factor of two till VDS reaches 3 V; current limiting is disabled when VDS is below 3 V. The boost
converter is enabled when VDS is below 0.5 V. An external capacitor connected to the soft-start pin, SS, is used
to slowly ramp up the internal switch current limit of the boost converter. The capacitor connected to the SS pin
is charged with a constant current that increases the voltage on the SS pin. The internal current limit is
proportional to the voltage on the SS pin. When the threshold voltage of the internal-switch soft-start comparator
is reached, the full current limit is released. The larger the soft-start capacitor value, the longer the soft-start time.
A 22-nF capacitor is usually sufficient for typical applications.
The boost converter has an overvoltage-protection circuit to prevent the switch voltage from exceeding the
absolute-maximum switch voltage rating in the event of a system fault. The device protects itself if the feedback
pin is connected to ground or floated, and clamps the voltage of the output of the boost converter to 20 V. To
implement the overvoltage protection, the overvoltage comparator shown in Figure 21 monitors the output
voltage via the SWI pin. As soon as the output voltage exceeds the overvoltage threshold (typically 20 V), the
device stops switching until the output voltage drops below the comparator threshold again. The typical
waveform when the device is in overvoltage protection is shown in Figure 7.
The boost converter has a short-circuit protection circuit to prevent the inductor or rectifier diode from
overheating when the output is shorted. The VDS sensor in the input-to-output isolation switch monitors the
voltage difference between SWI and SWO. If the boost output is shorted, and the voltage difference between
SWI and SWO exceeds the threshold (typically 1.4 V in full operation), then the boost converter shuts down, and
the input-to-output isolation switch limits VS current.
Low ESR ceramic capacitors are recommended for good input-voltage filtering. The TPS65162 has an analog
input (VIN) as well as a power supply input (SUP) powering all the internal rails. A 1-
F bypass capacitor is
required as close as possible from VIN to GND, and from SUP to GND. Depending on the overall load current,
two or three 22-
F input capacitors are required. For better input-voltage filtering, the input capacitor values can
be increased. Refer to Table 1 and the Typical Applications schematic for input capacitor recommendations.
Table 1. Input Capacitor Selection
CAPACITOR
COMPONENT SUPPLIER
COMMENTS
22
F / 16 V
Taiyo Yuden EMK316BJ226ML
Pin VIN, PVIN
2 ×10
F / 25 V
Taiyo Yuden TMK316BJ106KL
Pin VIN, PVIN (Alternative)
1
F / 35 V
Taiyo Yuden GMK107BJ105KA
Pin SUP, AVIN, VIN
1
F / 25 V
Taiyo Yuden TMK107BJ105KA
Pin SUP, AVIN, VIN
The frequency-select pin FREQ selects the switching frequency of the entire device to 500 kHz (FREQ=low) or
750 kHz (FREQ=high). A lower switching frequency gives a higher efficiency with a slightly reduced
load-transient regulation.
18
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65162
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