900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Unitrode

UC2825 Datasheet Preview

UC2825 Datasheet

High Speed PWM Controller

No Preview Available !

High Speed PWM Controller
application
INFO
available
UC1825
UC2825
UC3825
FEATURES
Compatible with Voltage or Current Mode
Topologies
Practical Operation Switching Frequencies
to 1MHz
50ns Propagation Delay to Output
High Current Dual Totem Pole Outputs
(1.5A Peak)
Wide Bandwidth Error Amplifier
Fully Latched Logic with Double Pulse
Suppression
Pulse-by-Pulse Current Limiting
Soft Start / Max. Duty Cycle Control
Under-Voltage Lockout with Hysteresis
Low Start Up Current (1.1mA)
DESCRIPTION
The UC1825 family of PWM control ICs is optimized for high fre-
quency switched mode power supply applications. Particular care
was given to minimizing propagation delays through the comparators
and logic circuitry while maximizing bandwidth and slew rate of the
error amplifier. This controller is designed for use in either cur-
rent-mode or voltage mode systems with the capability for input volt-
age feed-forward.
Protection circuitry includes a current limit comparator with a 1V
threshold, a TTL compatible shutdown port, and a soft start pin
which will double as a maximum duty cycle clamp. The logic is fully
latched to provide jitter free operation and prohibit multiple pulses at
an output. An under-voltage lockout section with 800mV of hysteresis
assures low start up current. During under-voltage lockout, the out-
puts are high impedance.
These devices feature totem pole outputs designed to source and
sink high peak currents from capacitive loads, such as the gate of a
power MOSFET. The on state is designed as a high level.
BLOCK DIAGRAM
SLUS235A - MARCH 1997 - REVISED MARCH 2004
UDG-92030-2




Unitrode

UC2825 Datasheet Preview

UC2825 Datasheet

High Speed PWM Controller

No Preview Available !

ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (Pins 13, 15) . . . . . . . . . . . . . . . . . . . . . . . . 30V
Output Current, Source or Sink (Pins 11, 14)
DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Pulse (0.5m s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0A
Analog Inputs
(Pins 1, 2, 7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
(Pin 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
Clock Output Current (Pin 4) . . . . . . . . . . . . . . . . . . . . . . . -5mA
Error Amplifier Output Current (Pin 3) . . . . . . . . . . . . . . . . 5mA
Soft Start Sink Current (Pin 8) . . . . . . . . . . . . . . . . . . . . . 20mA
Oscillator Charging Current (Pin 5) . . . . . . . . . . . . . . . . . . -5mA
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature Range . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . 300°C
CONNECTION DIAGRAMS
DIL-16 (Top View)
J or N Package
UC1825
UC2825
UC3825
SOIC-16 (Top View)
DW Package
PLCC-20 & LCC-20
(Top View)
Q & L Packages
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C 1
INV 2
NI 3
E/A Out
4
Clock
5
N/C 6
RT 7
CT 8
Ramp
9
Soft Start
10
N/C 11
ILIM/SD
12
Gnd 13
Out A
14
Pwr Gnd
15
N/C 16
VC 17
Out B
18
VCC
19
VREF 5.1V
20
THERMAL RATINGS TABLE
Package
DIL-16J
DIL-16N
PLCC-20
LCC-20
SOIC-16
Q
QJA
80-120
90(1)
43-75(1)
70-80
50-120(1)
QJC
28(2)
45
34
20(2)
35
Q
2


Part Number UC2825
Description High Speed PWM Controller
Maker Unitrode
Total Page 20 Pages
PDF Download

UC2825 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 UC282-1 Fast LDO Linear Regulator
etcTI
2 UC282-2 Fast LDO Linear Regulator
etcTI
3 UC282-3 Fast LDO Linear Regulator
etcTI
4 UC282-ADJ Fast LDO Linear Regulator
etcTI
5 UC2823 High Speed PWM Controller
Unitrode
6 UC2823A High Speed PWM Controller
Unitrode
7 UC2823A HIGH-SPEED PWM CONTROLLER
etcTI
8 UC2823B High Speed PWM Controller
Unitrode
9 UC2823B HIGH-SPEED PWM CONTROLLER
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy