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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 7/36頁 |
| 文件大小： | 1034K |
| 代理商： | TPS65162RGZR |
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APPLICATION INFORMATION
THERMAL SHUTDOWN
UNDERVOLTAGE LOCKOUT
REFERENCE OUTPUT, REF
START-UP SEQUENCING
V logic
VGL
DLY 1
Vs
VGHM
withVFLK
=high,
VDPM=high
DLY 2
Falltimedependsonoutput
capacitorsvalueandloadcurrent
EN1
EN2
www.ti.com ............................................................................................................................................................... SLVS771B – MAY 2007 – REVISED JUNE 2008
The thermal-shutdown feature prevents damage from excessive heat and power dissipation. Typically, the
thermal-shutdown threshold is 160°C. When the temperature drops below the thermal shutdown threshold, the
device restarts again automatically.
To avoid device malfunction at low input voltages, an undervoltage lockout is included, which shuts down the
device at voltages lower than 7.6 V.
The device provides a reference output that is used to regulate the negative charge pump. In order to have a
stable reference voltage, a 220-nF bypass capacitor is required, connected directly from REF to AGND. The
reference output has a current capability of 30
A which should not be exceeded. Because of this, the feedback
resistor from FBN to REF should not be smaller than 40 k
.
The start-up sequencing can be set by adjusting the capacitors connected to DLY1 and DLY2, and is controlled
by the signals EN1 and EN2. Pulling EN1 high enables the step-down converter. After the step down converter
has reached its power-good threshold, the other sequence timings are started. DLY1 sets the delay time
between the step-down converter and the negative charge-pump driver. This delay starts when the power-good
threshold of the step-down converter is reached. A high level on EN2 enables the boost converter. The boost
converter starts when the power-good threshold of the step down converter is reached and EN2 is pulled high.
DLY2 sets the delay time for the positive charge pump. This delay time starts when the power good threshold of
the step down converter is reached. After the delay time has expired, the positive charge pump and op-amps
start up. As the positive charge pump power-good threshold is reached, then the GPM block is enabled if VDPM
is high as well. See Figure 19.
Figure 19. Power-On Sequencing With EN2 Always High (EN2=VIN)
Copyright 2007–2008, Texas Instruments Incorporated
15
Product Folder Link(s): TPS65162
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