參數(shù)資料
型號: LTC4244CGN-1#TRPBF
廠商: Linear Technology
文件頁數(shù): 13/28頁
文件大小: 337K
描述: IC CTRLR HOTSWAP PCI 20-SSOP
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換控制器
應(yīng)用: CompactPCI?
內(nèi)部開關(guān):
電源電壓: 3.3V,5V,±12V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 20-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 帶卷 (TR)
13
LTC4244/LTC4244-1
42441f
Sense resistors R1 and R2 provide current fault detection
and R5 and C1 provide current control loop compensation
as well as ramp rate control for the GATE pin voltage.
Resistors R3 and R4 prevent high frequency oscillations
in MOSFETs Q1 and Q2.
A power-up sequence begins when the OFF/ON pin is
pulled low (Figure 2). This enables the pass transistors to
turn on and an internal 21礎(chǔ) current source is connected
to TIMER. Once the pass transistors begin to conduct
current, the supplies will start to power up. Current limit
faults are ignored while the TIMER pin voltage is ramping
up and is less than (12V
IN
 1.6V). When all four supply
voltages are within tolerance, HEALTHY# will pull low and
LOCAL_PCI_RST# is free to follow PCI_RST#.
Power-Down Sequence
When the BD_SEL# signal is pulled high, a power-down
sequence begins (Figure 3).
Internal switches are connected to each of the output
voltage supply pins to discharge the bypass capacitors to
ground. The TIMER pin is immediately pulled low. The
GATE pin is pulled down by a 60礎(chǔ) current source to
prevent the load currents on the 3.3V and 5V supplies from
going to zero instantaneously and glitching the power
supply voltages. When any of the output voltages dips
below its threshold, the HEALTHY# signal pulls high and
LOCAL_PCI_RST# will be asserted low.
APPLICATIO S I FOR ATIO
U
U
U
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
10V/DIV
5V
OUT
10V/DIV
3.3V
OUT
10V/DIV
V
EEOUT
10V/DIV
BD_SEL#
10V/DIV
HEALTHY#
10V/DIV
LCL_PCI_RST#
10V/DIV
10ms/DIV
4244 F02
Figure 2. Normal Power-Up Sequence
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
10V/DIV
5V
OUT
10V/DIV
3.3V
OUT
10V/DIV
V
EEOUT
10V/DIV
BD_SEL#
10V/DIV
HEALTHY#
10V/DIV
LCL_PCI_RST#
10V/DIV
20ms/DIV
4244 F03
Figure 3. Normal Power-Down Sequence
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