Modulator. UC1526A Datasheet

UC1526A Datasheet PDF


Part

UC1526A

Description

Regulating Pulse Width Modulator

Manufacture

Unitrode

Page 12 Pages
Datasheet
Download UC1526A Datasheet


UC1526A Datasheet
Regulating Pulse Width Modulator
UC1526A
UC2526A
UC3526A
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 (VIN = VC = VREF = 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 VIN, VC and VREF to a precision 5V input supply. Consult
factory for additional information.
BLOCK DIAGRAM
6/93

UC1526A Datasheet
ABSOLUTE MAXIMUM RATINGS (Note 1, 2)
Input Voltage (+VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage (+VC) . . . . . . . . . . . . . . . . . . . . . +40V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +5.5V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +VIN
Source/Sink Load Current (each output) . . . . . . . . . . . . 200mA
Reference Load Current . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Logic Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Power Dissipation at TA = +25°C (Note 2) . . . . . . . . . 1000mW
Power Dissipation at TC = +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
Note 1: Values beyond which damage may occur.
Note 2: Consult packaging Section of Databook for thermal
limitations and considerations of package.
UC1526A
UC2526A
UC3526A
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. . . . . . . . . . . . . . . . . . . 2kto 150k
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.
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
FUNCTION
PIN
N/C 1
+ERROR
2
-ERROR
3
COMP.
4
CSS 5
RESET
6
- CURRENT SENSE
7
+ CURRENT SENSE
8
SHUTDOWN
9
RTIMING
10
CT 11
RD 12
SYNC
13
OUTPUT A
14
VC 15
N/C 16
GROUND
17
OUTPUT B
18
+VIN
19
VREF
20
2


Features Datasheet pdf Regulating Pulse Width Modulator UC1526 A UC2526A UC3526A FEATURES • Reduced Supply Current • Oscillator Frequenc y to 600kHz • Precision Band-Gap Refe rence • 7 to 35V Operation • Dual 2 00mA Source/Sink Outputs • Minimum Ou tput Cross-Conduction • Double-Pulse Suppression Logic • Under-Voltage Loc kout • Programmable Soft-Start • Th ermal Shutdown • TTL/CMOS Compatible Logic Ports • 5 Volt Operation (VIN = VC = VREF = 5.0V) DESCRIPTION The UC1 526A Series are improved-performance pu lse-width modulator circuits intended f or direct replacement of equivalent non - “A” versions in all applications. Higher frequency operation has been en hanced by several significant improveme nts including: a more accurate oscillat or with less minimum dead time, reduced circuit delays (particularly in curren t limiting), and an improved output sta ge with negligible cross-conduction cur rent. Additional improvements include t he incorporation of a precision, band-gap reference generator, reduced overall supply curre.
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