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參數(shù)資料
| 型號： | UCC2882- |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Average Current Mode Synchronous Controller With 5-Bit DAC |
| 中文描述： | 平均電流模式同步控制器，5位DAC |
| 文件頁數(shù)： | 2/14頁 |
| 文件大小： | 579K |
| 代理商： | UCC2882- |
2
UCC2882/-1
UCC3882/-1
GATELO
N/C
D1
D0
VDRVHI
D2
D3
D4
GND
N/C
PWRGD
VDRVLO
IS+
VIN
CAM
CAO
ISOUT
VSNS
IS–
PGND
EN
VREF
COMMAND
GATEHI
RT
CT
VFB
COMP
14
13
12
11
10
9
8
7
6
5
4
3
2
1
15
16
17
18
19
20
21
22
23
24
25
26
27
28
CONNECTION DIAGRAM
DIL-28, SOIC-28 (Top View)
N, DW or PW Packages
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, VIN = VDRVHI = VDRVLO = 12V, VSNS = 3.5V, V
D0
= V
D1
= V
D2
= V
D3
= V
D4
= 0V, R
T
= 13k, C
T
= 1.8nF, EN = Open, 0°C < T
A
< 70°C, T
A
= T
J
.
PARAMETER
TEST CONDITIONS
Undervoltage Lockout
VIN UVLO Turn-on Threshold
VIN UVLO Turn-off Threshold
UVLO Threshold Hysteresis
Supply Current
l
IN
EN = 0V
MIN
TYP
MAX
UNITS
10.5
10
500
10.8
V
V
9.5
300
700
mV
7
12
mA
For all of the parts, grounding the EN pin disables the
GATEHI and GATELO outputs, shutting down the power
supply. For the 2882 and 3882 only, programming a DAC
output voltage below 1.8V, or programming all of the VID
pins high also disables the GATEHI and GATELO out-
puts. For the “–1" option parts, the GATEHI and GATELO
outputs are switching, and the power supply output volt-
age regulates at the programmed DAC output voltage for
all VID codes.
The
gain-bandwidth product to satisfy high performance sys-
tem requirements. The internal current sense amplifier
permits the use of a low value current sense resistor,
minimizing power loss. The oscillator frequency is exter-
voltage
and
current
amplifiers
have
2.5MHz
nally programmed with R
T
and C
T
. The foldback circuit
reduces the converter short circuit current limit to 50% of
its nominal value when the converter is short-circuited,
minimizing component stress and dissipation during ab-
normal conditions. The gate drivers are low impedance
totem pole output stages capable of driving large exter-
nal MOSFETs. Cross conduction is eliminated internally
by programming the dead time between turn-off and turn
on of the external high side and synchronous MOSFETs.
This device is available in a 28-pin wide body surface
mount package. The UCC2882 is specified for operation
from –25°C to +85°C and the UCC3882 is specified for
operation from 0°C to 70°C.
DESCRIPTION (continued)
ABSOLUTE MAXIMUM RATINGS
VDRVHI, GATEHI (Note 1) . . . . . . . . . . . . . . . . . –0.3V to 20V
VDRVLO, GATELO. . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 15V
All other pins referenced to GND . . . . . . . . . . . . . –0.3V to 5.3V
VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15V
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.). . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
Note 1: 20V at no load. Derate to 18.5V when used with capaci-
tive loads of greater than 1000pF in series with less than 20
.
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