- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381146 > UC1914 (Texas Instruments, Inc.) 5V to 35V Hot Swap Power Manager PDF資料下載
參數(shù)資料
| 型號： | UC1914 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5V to 35V Hot Swap Power Manager |
| 中文描述： | 5V至35V的熱插拔電源管理器 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 652K |
| 代理商： | UC1914 |
4
UC1914
UC2914
UC3914
PIN DESCRIPTIONS
CT:
A capacitor is connected to this pin in order to set
the maximum fault time. The minimum fault time must be
more than the time to charge external load capacitance.
The fault time is defined as:
CT
I
CH
T
FAULT
=
2
where I
CH
= 100
μ
A + I
PL
, where I
PL
is the current into the
power limit pin. Once the fault time is reached the output
will shutdown for a time given by:
CT
I
DIS
T
SD
=
2
where I
DIS
is nominally 3
μ
A.
FAULT:
Open collector output which pulls low upon any
of the following conditions: Timer fault, Shutdown, UVLO.
This pin
MUST
be pulled up to VCC or another supply
through a suitable impedance.
GND:
Ground reference for the IC.
IMAX:
This pin programs the maximum allowable
sourcing current. Since REF is a –2V reference (with re-
spect to VCC), a voltage divider can be derived from
VCC to REF in order to generate the program level for
the IMAX pin. The current level at which the output ap-
pears as a current source is equal to the voltage on the
IMAX pin, with respect to VCC, divided by the current
sense resistor. If desired, a controlled current startup can
be programmed with a capacitor on IMAX to VCC.
LR:
If this pin is held high and a fault occurs, the timer
will be prevented from resetting the fault latch when CT is
discharged below the reset comparator threshold. The
part will not retry until this pin is brought to a logic low or
a power-on-reset occurs. Pulling this pin low before the
reset time is reached will not clear the fault until the reset
time is reached. Floating or holding this pin low will result
in the part repeatedly trying to reset itself if a fault oc-
curs.
OUT:
Output drive to the MOSFET pass element. Inter-
nal clamping ensures that the maximum V
GS
drive is
15V.
OSC, OSCB:
Complementary output drivers for interme-
diate charge pump stages. A 0.01
μ
F capacitor should be
placed between OSC and PMP, and OSCB and PMPB.
PLIM:
This feature ensures that the average MOSFET
power dissipation is controlled. A resistor is connected
from this pin to VCC. Current will flow into PLIM which
adds to the fault timer charge current, reducing the duty
cycle from the typical 3% level. When I
PL
>> 100
μ
A then
the average MOSFET power dissipation is given by:
P
FET_AVG
= IMAX 3 10
–6
R
PL
.
PMP, PMPB:
Complementary pins which couple charge
pump capacitors to internal diodes and are used to pro-
vide charge to the reservoir capacitor tied to VPUMP.
Typical capacitor values used are 0.01
μ
F.
REF:
–2V reference with respect to VCC used to pro-
gram the IMAX pin voltage. A 0.1
μ
F ceramic or tantalum
capacitor
MUST
be tied between this pin and VCC to en-
sure proper operation of the chip.
SD:
When this TTL compatible input is brought to a logic
low, the output of the linear amplifier is driven low,
FAULT is pulled low and the IC is put into a low power
mode. The
ABSOLUTE
maximum voltage that can be
placed on this pin is 12V.
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, T
A
= 0°C to 70°C for the UC3914, –40°C to 85°C for the
UC2914, and –55°C to 125°C for the UC1914. VCC = 12V, V
PUMP
= V
PUMP
(max), SD = 5V, CP1 = CP2 = C
PUMP
= 0.01
μ
F.
T
A
= T
J
.
PARAMETER
TEST CONDITIONS
Latch Section
LR Threshold
High to Low
Input Current
LR = 5V
Power Limiting Section
Duty Cycle Control
In Fault, I
PLIM
= 200
μ
A
In Fault, I
PLIM
= 3mA
Overload Section
Delay to Output
(Note 1)
Threshold
Respect to IMAX
Note 1: Guaranteed by design. Not 100% tested in production.
Note 2: A mathematical averaging is used to determine this value. See Application Section for more information.
MIN
TYP
MAX
UNITS
0.6
1.4
500
2.0
750
V
μ
A
0.6
0.05
1.3
0.12
2.0
0.20
%
%
500
–200
1250
–150
ns
mV
–250
相關PDF資料 |
PDF描述 |
|---|---|
| UC2548 | Primary Side PWM Controller |
| UC2705J | High Speed Power Driver |
| UC2705T | High Speed Power Driver |
| UC2844BD1R2 | HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC2844B | High Performance Current Mode Controllers(高性能電流模式控制器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UC1914J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Control/Management |
| UC19431 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision Adjustable Shunt Regulator |
| UC19432 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision Analog Controller |
| UC19432J | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision Analog Controller |
| UC19432J883B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision Analog Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復。