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UC184XA PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UC184XA
기능 CURRENT MODE PWM CONTROLLER
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UC184XA 데이터시트, 핀배열, 회로
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1840
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The UC184xA family of control ICs
provides all the necessary features to
implement off-line fixed-frequency,
current-mode switching power supplies
with a minimum of external compo-
nents. The current mode architecture
demonstrates improved load regulation,
pulse-by-pulse current limiting and
inherent protection of the power supply
output switch. The IC includes: A
bandgap reference trimmed to ±1%
accuracy, an error amplifier, a current
sense comparator with internal clamp to
1V, a high current totem pole output
stage for fast switching of power
MOSFET's, and an externally program-
mable oscillator to set frequency and
maximum duty cycle. The under-
voltage lock-out is designed to operate
with 250µA typ. start-up current,
allowing an efficient bootstrap supply
voltage design. Available options for
this family of products, such as start-up
voltage hysteresis and duty cycle, are
summarized below in the Available
Options section. The UC184xA family
of control ICs is also available in 14-pin
SOIC package which makes the Power
Output Stage Collector and Ground pins
available.
PRODUCT HIGHLIGHT
COMPARISON OF UC384XA VS. SG384 X DISCHARGE CURRENT
SG384x
Min. Limit
UC384xA
TA=25°C
SG384x
Max. Limit
KEY FEATURES
s LOW START-UP CURRENT. (0.5mA max.)
s TRIMMED OSCILLATOR DISCHARGE
CURRENT. (See Product Highlight)
p OPTIMIZED FOR OFF-LINE AND DC-TO-DC
CONVERTERS.
p AUTOMATIC FEED FORWARD
COMPENSATION.
p PULSE-BY-PULSE CURRENT LIMITING.
p ENHANCED LOAD RESPONSE
CHARACTERISTICS.
p UNDER-VOLTAGE LOCKOUT WITH
HYSTERESIS.
p DOUBLE PULSE SUPPRESSION.
p HIGH-CURRENT TOTEM POLE OUTPUT.
p INTERNALLY TRIMMED BANDGAP
REFERENCE.
p 500KHz OPERATION.
p LOW RO ERROR AMPLIFIER.
A P P L I C AT I O N S
s ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
s DC-DC BUCK OR BOOST CONVERTERS.
s LOW COST DC MOTOR CONTROL.
7.5 7.8
−3σ
8.3
Mean
8.8 9.3
+3σ
Discharge Current Distribution - mA
AVAILABLE OPTIONS
Part # Start-Up Hysteresis Max. Duty
Voltage
Cycle
UCx842A 16V
6V <100%
UCx843A 8.4V 0.8V <100%
UCx844A 16V
6V <50%
UCx845A 8.4V 0.8V <50%
TA (°C)
PACKAGE ORDER INFORMATION
M
Plastic DIP
8-pin
DM
Plastic
8-pin
SOIC
D
Plastic SOIC
14-pin
Y
Ceramic DIP
8-pin
0 to 70
-40 to 85
-55 to 125
UC384xAM
UC284xAM
UC384xADM
UC284xADM
UC384xAD
UC284xAD
UC284xAY
UC184xAY
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
Copyright © 1995
Rev. 1.2 12/95
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1




UC184XA pdf, 반도체, 판매, 대치품
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
E L E C T R I C A L C H A R A C T E R I S T I C S (Con't.)
Parameter
Symbol
Under-Voltage Lockout Section
Test Conditions
UC184xA/284xA
UC384xA
Units
Min. Typ. Max. Min. Typ. Max.
Start Threshold
Min. Operation Voltage After Turn-On
PWM Section
x842A/4A
x843A/5A
x842A/4A
x843A/5A
15 16 17 14.5 16 17.5
7.8 8.4 9.0 7.8 8.4 9.0
9 10 11 8.5 10 11.5
7.0 7.6 8.2 7.0 7.6 8.2
V
V
V
V
Maximum Duty Cycle
Minimum Duty Cycle
Total Standby Section
x842A/3A
x844A/5A
94 96 100 94 96 100
47 48 50 47 48 50
00
%
%
%
Start-Up Current
Operating Supply Current
Zener Voltage
ICC
VZ ICC = 25mA
Notes: 2. These parameters, although guaranteed, are not 100% tested in
production.
3. Parameter measured at trip point of latch with V = 0.
VFB
4. Gain defined as: AVOL =
V
COMP
VISENSE
; 0 VISENSE 0.8V.
5. Adjust VCC above the start threshold before setting at 15V.
6. Output frequency equals oscillator frequency for the UC1842A
and UC1843A. Output frequency is one half oscillator frequency
for the UC1844A and UC1845A.
0.3 0.5
0.3 0.5
11 17
11 17
30 35
30 35
mA
mA
V
7. "Temperature stability, sometimes referred to as average temperature
coefficient, is described by the equation:
V (max.) - V (min.)
Temp Stability =
REF REF
T (max.) - T (min.)
JJ
VREF (max.) & VREF (min.) are the maximum & minimum reference
voltage measured over the appropriate temperature range. Note that
the extremes in voltage do not necessarily occur at the extremes in
temperature."
VCC *
GROUND **
RT/CT
VFB
COMP
CURRENT SENSE
BLOCK DIAGRAM
34V
UVLO
16V (1842A/4A)
8.4V (1843A/5A)
2.5V
UVLO
S/R
Hysteresis
6V (1842A/4A)
0.8V (1843A/5A)
5V
Ref
VREF
Good Logic
Internal
Bias
Oscillator
Error Amp
2R
R
*** T
S
R PWM
1V Latch
Current Sense
Comparator
VREF
5.0V
50mA
VC*
OUTPUT
POWER GROUND**
* - VCC and VC are internally connected for 8 pin packages.
** - POWER GROUND and GROUND are internally connected for 8 pin packages.
*** - Toggle flip flop used only in x844A and x845A series.
4 Copyright © 1995
Rev. 1.2 12/95

4페이지










UC184XA 전자부품, 판매, 대치품
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
T Y P I C A L A P P L I C A T I O N C I R C U I T S (continued)
8(14)
2N222A
RT
RSLOPE
From VO
CT
4(7)
Ri 2(3)
Rd CF RF
1(1)
FIGURE 6. — SLOPE COMPENSATION
5V
UVLO
2.5V
UCx84xA
S 5V
R REF
VREF
GOOD LOGIC
INTERNAL
BIAS
OSCILLATOR
ERROR
AMP
2R
R
C.S.
COMP
1V
PWM
LATCH
5(9)
VCC
7(12)
DC BUS
7(11)
6(10)
Q1
5(8)
R
3(5)
C RS
Due to inherent instability of current mode converters running above 50% duty cycle, slope compensation should be added to either
the current sense pin or the error amplifier. Figure 6 shows a typical slope compensation technique.
VO
4.7K
1K
ERROR AMP
ADJUST
4.7K
FIGURE 7. OPEN LOOP LABORATORY FIXTURE
2N2222
100K
5K
ISENSE
ADJUST
RT
UCx84xA
1 COMP
VREF 8
2 VFB
VCC 7
3 ISENSE
OUTPUT 6
4 RTCT
GROUND 5
A
0.1µF 0.1µF
1K
VREF
VCC
OUTPUT
GROUND
CT
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be
connected to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an
adjustable ramp to pin 3.
Copyright © 1995
Rev. 1.2 12/95
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UC184XA

CURRENT MODE PWM CONTROLLER

Microsemi Corporation
Microsemi Corporation

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