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參數資料
| 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： | 2/14頁 |
| 文件大?。?/td> | 652K |
| 代理商： | UC1914 |
2
UC1914
UC2914
UC3914
CONNECTION DIAGRAM
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
VCC Section
I
CC
(Note 2)
VCC = 35V, (Note 2)
Shutdown I
CC
SD = 0V
UVLO
Turn on threshold
UVLO Hysteresis
Fault Timing Section
Overcurrent Threshold
T
J
= 25°C, with respect to VCC
Over operating temperature, with respect to VCC
IMAX Input Bias
CT Charge Current
CT = 1V
CT Discharge Current
CT = 1V
CT Charge Current
CT = 1V, Overload condition
CT Fault Threshold
CT Reset Threshold
Output Duty Cycle
Fault condition, I
PL
= 0
MIN
TYP
MAX
UNITS
8
12
500
4.0
200
15
20
900
4.4
350
mA
mA
μ
A
V
mV
100
–55
–57
–50
–50
1
–100
3.0
–3.0
2.50
0.50
3.0
–45
–42
3
–60
4.5
–1.5
2.75
0.55
4.5
mV
mV
μ
A
μ
A
μ
A
mA
V
V
%
–140
2.0
–6.0
2.25
0.45
1.5
Input Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Maximum Forced Voltage
SD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
IMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC
LR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Maximum Current
FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
PLIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Maximum Voltage, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Reference Output Current . . . . . . . . . . . . . . . Internally Limited
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.). . . . . . . . . . . . . +300°C
Unless otherwise indicated, voltages are referenced to ground.
Currents are positive into, negative out of specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of package.
ABSOLUTE MAXIMUM RATINGS
When the output current is less than the fault level, the
external output transistor remains switched on. When the
output current exceeds the fault level, but is less than the
maximum sourcing level programmed by IMAX, the out-
put remains switched on, and the fault timer starts to
charge C
T
, a timing capacitor. Once C
T
charges to 2.5V,
the output device is turned off and C
T
is slowly dis-
charged. Once C
T
is discharged to 0.5V, the IC performs
a retry and the output transistor is switched on again.
The UC3914 offers two distinct reset modes. In one
mode with LR left floating or held low, the IC will repeat-
edly try to reset itself if a fault occurs as described
above. In the second mode with LR held high, once a
fault occurs, the output is latched off until either LR is
toggled low, the part is shutdown then re-enabled using
SD, or the power to the part is turned off and then on
again.
This part is offered in both 18 pin DW Wide-Body (SOIC)
and Dual-In-Line (DIL) packages.
DESCRIPTION (cont.)
DIL-18, SOIC-18 (Top View)
N or J Package, DW Package
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