2024年3月24日发(作者：尉玲珑)
查询UC1526A供应商
UC1526A
UC2526A
UC3526A
Regulating Pulse Width Modulator
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
Reduced Supply Current
Oscillator Frequency to 600kHz
Precision Band-Gap Reference
7 to 35V Operation
Dual 200mA Source/Sink Outputs
Minimum Output Cross-Conduction
Double-Pulse Suppression Logic
Under-Voltage Lockout
Programmable Soft-Start
Thermal Shutdown
TTL/CMOS Compatible Logic Ports
5 Volt Operation (V
IN
= V
C
= V
REF
= 5.0V)
DESCRIPTION
The UC1526A Series are improved-performance pulse-width modu-
lator circuits intended for direct replacement of equivalent non- “A”
versions in all applications. Higher frequency operation has been
enhanced by several significant improvements including: a more ac-
curate oscillator with less minimum dead time, reduced circuit de-
lays (particularly in current limiting), and an improved output stage
with negligible cross-conduction current. Additional improvements
include the incorporation of a precision, band-gap reference gener-
ator, reduced overall supply current, and the addition of thermal
shutdown protection.
Along with these improvements, the UC1526A Series retains the
protective features of under-voltage lockout, soft-start, digital cur-
rent limiting, double pulse suppression logic, and adjustable
deadtime. For ease of interfacing, all digital control ports are TTL
compatible with active low logic.
Five volt (5V) operation is possible for “logic level” applications by
connecting V
IN,
V
C
and V
REF
to a precision 5V input supply. Consult
factory for additional information.
BLOCK DIAGRAM
6/93
UC1526A
UC2526A
UC3526A
ABSOLUTE MAXIMUM RATINGS (Note 1, 2)
Input Voltage (+V
IN)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage (+V
C
). . . . . . . . . . . . . . . . . . . . . +40V
Logic Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +5.5V
Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +V
IN
Source/Sink Load Current (each output). . . . . . . . . . . . 200mA
Reference Load Current. . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Logic Sink Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Power Dissipation at T
A
= +25°C (Note 2) . . . . . . . . . 1000mW
Power Dissipation at T
C
= +25°C (Note 2). . . . . . . . . . 3000mW
Operating Junction Temperature. . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range. . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (soldering, 10 seconds). . . . . . . . . . +300°C
RECOMMENDED OPERATING CONDITIONS
(Note 3)
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V to +35V
Collector Supply Voltage. . . . . . . . . . . . . . . . . . +4.5V to +35V
Sink/Source Load Current (each output). . . . . . . . 0 to 100mA
Reference Load Current. . . . . . . . . . . . . . . . . . . . . . 0 to 20mA
Oscillator Frequency Range. . . . . . . . . . . . . . . . 1Hz to 600kHz
Oscillator Timing Resistor. . . . . . . . . . . . . . . . . . . 2kΩ to 150kΩ
Oscillator Timing Capacitor. . . . . . . . . . . . . . . . . 400pF to 20µF
Available Deadtime Range at 40kHz. . . . . . . . . . . . 1% to 50%
Operating Ambient Temperature Range
UC1526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
UC2526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25°C to +85°C
UC3526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Note 3:Range over which the device is functional and
parameter limits are guaranteed.
Note 1:Values beyond which damage may occur.
Note 2: Consult packaging Section of Databook for thermal
limitations and considerations of package.
CONNECTION DIAGRAMS
DIL-18, SOIC-18 (TOP VIEW)
J or N Package, DW Package
PLCC-20, LCC-20
(TOP VIEW)
Q and L Packages
PACKAGE PIN FUNCTION
FUNCTIONPIN
N/C
+ERROR
-ERROR
COMP.
C
SS
RESET
- CURRENT SENSE
+ CURRENT SENSE
SHUTDOWN
R
TIMING
C
T
R
D
SYNC
OUTPUT A
V
C
N/C
GROUND
OUTPUT B
+V
IN
V
REF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2
2024年3月24日发(作者：尉玲珑)
查询UC1526A供应商
UC1526A
UC2526A
UC3526A
Regulating Pulse Width Modulator
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
Reduced Supply Current
Oscillator Frequency to 600kHz
Precision Band-Gap Reference
7 to 35V Operation
Dual 200mA Source/Sink Outputs
Minimum Output Cross-Conduction
Double-Pulse Suppression Logic
Under-Voltage Lockout
Programmable Soft-Start
Thermal Shutdown
TTL/CMOS Compatible Logic Ports
5 Volt Operation (V
IN
= V
C
= V
REF
= 5.0V)
DESCRIPTION
The UC1526A Series are improved-performance pulse-width modu-
lator circuits intended for direct replacement of equivalent non- “A”
versions in all applications. Higher frequency operation has been
enhanced by several significant improvements including: a more ac-
curate oscillator with less minimum dead time, reduced circuit de-
lays (particularly in current limiting), and an improved output stage
with negligible cross-conduction current. Additional improvements
include the incorporation of a precision, band-gap reference gener-
ator, reduced overall supply current, and the addition of thermal
shutdown protection.
Along with these improvements, the UC1526A Series retains the
protective features of under-voltage lockout, soft-start, digital cur-
rent limiting, double pulse suppression logic, and adjustable
deadtime. For ease of interfacing, all digital control ports are TTL
compatible with active low logic.
Five volt (5V) operation is possible for “logic level” applications by
connecting V
IN,
V
C
and V
REF
to a precision 5V input supply. Consult
factory for additional information.
BLOCK DIAGRAM
6/93
UC1526A
UC2526A
UC3526A
ABSOLUTE MAXIMUM RATINGS (Note 1, 2)
Input Voltage (+V
IN)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage (+V
C
). . . . . . . . . . . . . . . . . . . . . +40V
Logic Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +5.5V
Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +V
IN
Source/Sink Load Current (each output). . . . . . . . . . . . 200mA
Reference Load Current. . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Logic Sink Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Power Dissipation at T
A
= +25°C (Note 2) . . . . . . . . . 1000mW
Power Dissipation at T
C
= +25°C (Note 2). . . . . . . . . . 3000mW
Operating Junction Temperature. . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range. . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (soldering, 10 seconds). . . . . . . . . . +300°C
RECOMMENDED OPERATING CONDITIONS
(Note 3)
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V to +35V
Collector Supply Voltage. . . . . . . . . . . . . . . . . . +4.5V to +35V
Sink/Source Load Current (each output). . . . . . . . 0 to 100mA
Reference Load Current. . . . . . . . . . . . . . . . . . . . . . 0 to 20mA
Oscillator Frequency Range. . . . . . . . . . . . . . . . 1Hz to 600kHz
Oscillator Timing Resistor. . . . . . . . . . . . . . . . . . . 2kΩ to 150kΩ
Oscillator Timing Capacitor. . . . . . . . . . . . . . . . . 400pF to 20µF
Available Deadtime Range at 40kHz. . . . . . . . . . . . 1% to 50%
Operating Ambient Temperature Range
UC1526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
UC2526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25°C to +85°C
UC3526A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Note 3:Range over which the device is functional and
parameter limits are guaranteed.
Note 1:Values beyond which damage may occur.
Note 2: Consult packaging Section of Databook for thermal
limitations and considerations of package.
CONNECTION DIAGRAMS
DIL-18, SOIC-18 (TOP VIEW)
J or N Package, DW Package
PLCC-20, LCC-20
(TOP VIEW)
Q and L Packages
PACKAGE PIN FUNCTION
FUNCTIONPIN
N/C
+ERROR
-ERROR
COMP.
C
SS
RESET
- CURRENT SENSE
+ CURRENT SENSE
SHUTDOWN
R
TIMING
C
T
R
D
SYNC
OUTPUT A
V
C
N/C
GROUND
OUTPUT B
+V
IN
V
REF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2