Modulator. UC1526 Datasheet

UC1526 Datasheet PDF


Part

UC1526

Description

Regulating Pulse Width Modulator

Manufacture

Unitrode

Page 10 Pages
Datasheet
Download UC1526 Datasheet


UC1526 Datasheet
Regulating Pulse Width Modulator
UC1526
UC2526
UC3526
FEATURES
8 To 35V Operation
5V Reference Trimmed To ±1%
1Hz To 400kHz Oscillator Range
Dual 100mA Source/Sink Outputs
Digital Current Limiting
Double Pulse Suppression
Programmable Deadtime
Under-Voltage Lockout
Single Pulse Metering
Programmable Soft-Start
Wide Current Limit Common Mode Range
TTL/CMOS Compatible Logic Ports
Symmetry Correction Capability
Guaranteed 6 Unit Synchronization
DESCRIPTION
The UC1526 is a high performance monolithic pulse width modulator
circuit designed for fixed-frequency switching regulators and other
power control applications. Included in an 18-pin dual-in-line pack-
age are a temperature compensated voltage reference, sawtooth os-
cillator, error amplifier, pulse width modulator, pulse metering and
setting logic, and two low impedance power drivers. Also included
are protective features such as soft-start and under-voltage lockout,
digital current limiting, double pulse inhibit, a data latch for single
pulse metering, adjustable deadtime, and provision for symmetry cor-
rection inputs. For ease of interface, all digital control ports are TTL
and B-series CMOS compatible. Active LOW logic design allows
wired-OR connections for maximum flexibility. This versatile device
can be used to implement single-ended or push-pull switching regu-
lators of either polarity, both transformerless and transformer cou-
pled. The UC1526 is characterized for operation over the full military
temperature range of -55°C to +125°C. The UC2526 is characterized
for operation from -25°C to +85°C, and the UC3526 is characterized
for operation from 0° to +70°C.
BLOCK DIAGRAM
6/93

UC1526 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.
CONNECTION DIAGRAMS
UC1526
UC2526
UC3526
RECOMMENDED OPERATING CONDITIONS (Note 3)
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8V 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 400kHz
Oscillator Timing Resistor . . . . . . . . . . . . . . . . . . . 2kto 150k
Oscillator Timing Capacitor . . . . . . . . . . . . . . . . . . . 1nF to 20µF
Available Deadtime Range at 40kHz . . . . . . . . . . . . . 3% to 50%
Operating Ambient Temperature Range
UC1526 . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
UC2526 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25°C to +85°C
UC3526 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0°C to +70°C
Note 3: Range over which the device is functional and
parameter limits are guaranteed.
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
C__S_S___
Reset
5
6
- Current Sense
7
+__C__u_rr_e_n_t_Sense
Shutdown
8
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
ELECTRICAL CHARACTERISTICS: +VIN = 15V, and over operating ambient temperature, unless otherwise
specified, TA = TJ.
PARAMETER
Reference Section (Note 4)
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output
Voltage Range
Short Circuit Current
Un_d_e_r__-V__oltage Lockout
RESET Output Voltage
Note 4: IL = 0mA.
TEST CONDITIONS
TJ = + 25°C
+VIN = 8 to 35V
IL = 0 to 20mA
Over Operating TJ
Over Recommended
Operating Conditions
VREF = 0V
VREF = 3.8V
VREF = 4.8V
UC1526 / UC2526
UC3526
UNITS
MIN TYP MAX MIN TYP MAX
4.95 5.00 5.05 4.90 5.00 5.10
10 20
10 30
10 30
10 50
15 50
15 50
4.90 5.00 5.10 4.85 5.00 5.15
V
mV
mV
mV
V
25 50 100 25 50 100 mA
0.2 0.4
0.2 0.4
2.4 4.8
2.4 4.8
V
V
2


Features Datasheet pdf Regulating Pulse Width Modulator UC1526 UC2526 UC3526 FEATURES • 8 To 35V O peration • 5V Reference Trimmed To ± 1% • 1Hz To 400kHz Oscillator Range Dual 100mA Source/Sink Outputs • D igital Current Limiting • Double Puls e Suppression • Programmable Deadtime • Under-Voltage Lockout • Single P ulse Metering • Programmable Soft-Sta rt • Wide Current Limit Common Mode R ange • TTL/CMOS Compatible Logic Port s • Symmetry Correction Capability Guaranteed 6 Unit Synchronization DE SCRIPTION The UC1526 is a high performa nce monolithic pulse width modulator ci rcuit designed for fixed-frequency swit ching regulators and other power contro l applications. Included in an 18-pin d ual-in-line package are a temperature c ompensated voltage reference, sawtooth oscillator, error amplifier, pulse widt h modulator, pulse metering and setting logic, and two low impedance power dri vers. Also included are protective feat ures such as soft-start and under-voltage lockout, digital current limiting, double pulse in.
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