UNITRODE UC1584, UC2584, UC3584 Technical data

UC1584
UC2584
UC3584
03/99
FEATURES
Practical Operation at Switching
Frequencies up to 1MHz
Wide Band Error Amplifier
Undervoltage Lockout with Hysteresis
Output Active Low During UVLO
Control
Trimmed Bandgap Reference
Internally Regulated 15V Boost
Supply
Short Circuit Protection with
Programmable Delay
Secondary Side Synchronous Post Regulator
DESCRIPTION
The UC3584 is a low voltage, Secondary Side Synchronous Post Regula-
tor. It is intended to be used for auxiliary output voltage regulation in single
secondary winding, multiple output power supplies (for more details refer
to the Application Section of this Data sheet). The UC3584 is most suited
for systems where the main output is regulated between 5V and 14V. Out-
put voltages regulated by the UC3584 can range from virtually 0V up to
the output voltage of the main output.
Auxiliary output voltage regulation with the UC3584 uses leading edge
modulation making it compatible to primary side peak current or voltage
mode control. The UC3584 clock circuit is synchronized to the switching
frequency utilizing the falling edge of the transformer’s secondary winding
waveform.
15
13
14
16
11
9
10
12
SYNC
CT
RT
VREG
VCC
220pF
15k
100pF
1k
BST2
PGND
FB
BST1
0.1µF
1N4148
0.1µF
10µF
SOLID
TANTALUM
+
1N4148
33µH
COLTRONICS
470µF
+
2
4
3
1
6
8
7
5
COMP
SS
CDLY
GND
SRC
OUT
VFLT
1.5µF
120pF
1000pF
0.1µF
3300pF
20k
30.1k
1500pF
1.33k
24.3k
3.3V
AUX
100
1.5W
0.1µF
390µF
33µH
COILTRONICS
CSHD
10-45L
IRFR024
4.75k
3.57k 3.3
++++
7µH
OS-CON
330µF
+
1µF
+
5V
MAIN
170kHz
PUSH-PULL
2
210
10
10BQ040
TYPICAL APPLICATION DIAGRAM.
UDG-99062
查询UC1584供应商
2
UC1584
UC2584
UC3584
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
V
FLT
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V, 30V at 2A
Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 20V
SYNC Maximum Sink Current. . . . . . . . . . . . . . . . . . . . . 600µA
PWM Driver, I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 300mA
PWM Driver, I
OUT
(Peak). . . . . . . . . . . . . . . . . . . . . . . . . ± 1.5A
Maximum Operating Frequency . . . . . . . . . . . . . . . . . . . . 1MHz
Power Dissipation at T
A
= 60°C . . . . . . . . . . . . . . . . . . . . . . 1W
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 specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
CONNECTION DIAGRAMS
DIL-16, SOIC-16 (Top View)
J, N or DW Packages
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, T
A
= 0°C to 70°C for the UC3584, –40°C to 85°C for
the UC2584, and –55°C to 125°C for the UC1584, VCC = 15V. T
A
=T
J
.
PARAMETERS TEST CONDITIONS MIN TYPE MAX UNITS
Error Amplifier
FB COMP = FB 1.468 1.5 1.532 V
I
FB
V
COMP
=V
FB
150 300 450 nA
COMP V
OL
FB = 1.6V, I
COMP
= 200µA 50 400 mV
COMP V
OH
FB = 1.4V, I
COMP
= –200µA 5.1 5.5 7 V
AVOL 60 80 dB
PSRR (COMP) COMP = FB, VCC = 14V to 16V 60 dB
GBW Product F = 100kHz 5 10 MHz
Oscillator
Frequency R
T
= 3.75k, C
T
= 400pF, No Synchronization 500 kHz
Ramp Low R
T
= 3.75k, C
T
= 400pF, No Synchronization 1.75 V
Ramp High R
T
= 3.75k, C
T
= 400pF, No Synchronization 3.5 V
Ramp Amplitude R
T
= 3.75k, C
T
= 400pF, No Synchronization 1.75 V
PWM
Maximum Duty Cycle COMP = 4.5V 90 %
Minimum Duty Cycle COMP = 0V 0 %
PWM DRIVER
V
SAT
High V
FLT
–V
OUT
,I
OUT
= –100mA 2.5 3 V
V
SAT
Low V
OUT
–V
SRC
,I
OUT
= 50mA 0.8 2.2 V
T
RISE
Load = 1nF, SRC = 0V, Measure V
OUT
1V to 9V 75 100 ns
T
FALL
Load = 1nF, SRC = 0V, Measure V
OUT
9V to 1V 25 100 ns
TEMPERATURE RANGE PACKAGE
UC1584J –55°C to +125°C CDIP
UC2584DW –40°C to +85°C SOIC-Wide
UC2584N PDIP
UC3584DW 0°C to +70°C SOIC-Wide
UC3584N PDIP
ORDERING INFORMATION
3
UC1584
UC2584
UC3584
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, T
A
= 0°C to 70°C for the UC3584, –40°C to 85°C for the
UC2584, and –55°C to 125°C for the UC1584, VCC = 15V. T
A
=T
J
.
PARAMETERS TEST CONDITIONS MIN TYPE MAX UNITS
Soft Start
Charge Current 30 µA
Discharge Current 1mA
SS Delay C
SS
= 500nF 50 ms
Fault Latch
Charge Current 30 µA
Discharge Current 5mA
Fault Latch Delay CDLY = 500nF 50 ms
UVLO
VCC On 10.5 V
Hysteresis 1.7 V
Regulated Voltage
V
REG
I
REG
= 0mA to 1mA 4.8 5.2 V
VCC Regulator
VCC Boost inductor connected to 5V 14 15 16 V
I
CC
No Load, Boost Circuitry Inactive 12 40 mA
No Load, Boost Circuitry Active (Note 1) 55 mA
Note 1: Guaranteed by design. Not 100% tested in production.
BLOCK DIAGRAM
UDG-97141
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