D ts e t
aa h e
R c e t r lc r nc
o h se Ee to is
Ma u a t r dCo o e t
n fc u e
mp n n s
R c e tr b a d d c mp n ns ae
o h se rn e
o oet r
ma ua trd u ig ete dewaes
n fcue sn i r i/ fr
h
p rh s d f m te oiia s p l r
uc a e r
o h r n l u pi s
g
e
o R c e tr waes rce td f m
r o h se
fr e rae r
o
te oiia I. Al rce t n ae
h
r nl P
g
l e rai s r
o
d n wi tea p o a o teOC
o e t h p rv l f h
h
M.
P r aetse u igoiia fcoy
at r e td sn r n la tr
s
g
ts p o rmso R c e tr e eo e
e t rga
r o h se d v lp d
ts s lt n t g aa te p o u t
e t oui s o u rne
o
rd c
me t o e c e teOC d t s e t
es r x e d h
M aa h e.
Qu l yOv riw
ai
t
e ve
• IO- 0 1
S 90
•A 92 cr ct n
S 1 0 et ai
i
o
• Qu l e Ma ua trr Ls (
ai d
n fcues it QML MI- R -
) LP F
385
53
•C a sQ Mitr
ls
lay
i
•C a sVS a eL v l
ls
p c ee
• Qu l e S p l r Ls o D sr uos( L )
ai d u pi s it f it b tr QS D
e
i
•R c e trsacic l u pir oD A a d
o h se i
r ia s p l t L n
t
e
me t aln u t a dD A sa d r s
es lid sr n L tn ad .
y
R c e tr lcrnc , L i c mmi e t
o h se Ee t is L C s o
o
tdo
t
s p ligp o u t ta s t f c so r x e t-
u pyn rd cs h t ai y u tme e p ca
s
t n fr u lya daee u loto eoiial
i s o q ai n r q a t h s r n l
o
t
g
y
s p l db id sr ma ua trr.
u pi
e yn ut
y n fcues
T eoiia ma ua trr d ts e t c o a yn ti d c me t e e t tep r r n e
h r n l n fcue’ aa h e a c mp n ig hs o u n r cs h ef ma c
g
s
o
a ds e ic t n o teR c e tr n fcue v rino ti d vc . o h se Ee t n
n p c ai s f h o h se ma ua trd eso f hs e ie R c e tr lcr -
o
o
isg aa te tep r r n eo i s mio d co p o u t t teoiia OE s e ic -
c u rne s h ef ma c ft e c n u tr rd cs o h r n l M p c a
o
s
g
t n .T pc lv le aefr eee c p r o e o l. eti mii m o ma i m rt g
i s ‘y ia’ au s r o rfrn e up s s ny C r n nmu
o
a
r xmu ai s
n
ma b b s do p o u t h rceiain d sg , i lt n o s mpetsig
y e a e n rd c c aa tr t , e in smuai , r a l e t .
z o
o
n
© 2 1 R cetr l t n s LC Al i t R sre 0 1 2 1
0 3 ohs E cr i , L . lRg s eevd 7 1 0 3
e e oc
h
T l r m r, l s v iw wrcl . m
o e n oe p ae it w . e c o
a
e
s
o ec
application
INFO
available
UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
Low-Power BiCMOS Current-Mode PWM
FEATURES
•
100
µ
A Typical Starting Supply Current
•
500
µ
A Typical Operating Supply
Current
•
Operation to 1MHz
•
Internal Soft Start
•
Internal Fault Soft Start
•
Internal Leading-Edge Blanking of the
Current Sense Signal
•
1 Amp Totem-Pole Output
•
70ns Typical Response from
Current-Sense to Gate Drive Output
•
1.5% Tolerance Voltage Reference
•
Same Pinout as UC3842 and
UC3842A
Part Number
UCCx800
UCCx801
UCCx802
UCCx803
UCCx804
UCCx805
DESCRIPTION
The UCC1800/1/2/3/4/5 family of high-speed, low-power integrated cir-
cuits contain all of the control and drive components required for off-line
and DC-to-DC fixed frequency current-mode switching power supplies
with minimal parts count.
These devices have the same pin configuration as the UC1842/3/4/5
family, and also offer the added features of internal full-cycle soft start
and internal leading-edge blanking of the current-sense input.
The UCC1800/1/2/3/4/5 family offers a variety of package options, tem-
perature range options, choice of maximum duty cycle, and choice of
critical voltage levels. Lower reference parts such as the UCC1803 and
UCC1805 fit best into battery operated systems, while the higher refer-
ence and the higher UVLO hysteresis of the UCC1802 and UCC1804
make these ideal choices for use in off-line power supplies.
The UCC180x series is specified for operation from –55 C to +125 C,
o
o
the UCC280x series is specified for operation from –40 C to +85 C, and
o
o
the UCC380x series is specified for operation from 0 C to +70 C.
o
o
Maximum Duty Cycle
100%
50%
100%
100%
50%
50%
Reference Voltage
5V
5V
5V
4V
5V
4V
Turn-On Threshold
7.2V
9.4V
12.5V
4.1V
12.5V
4.1V
Turn-Off Threshold
6.9V
7.4V
8.3V
3.6V
8.3V
3.6V
BLOCK DIAGRAM
UDG92009-3
SLUS270C
- MARCH 1999 - REVISED JANUARY 2005
UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
ABSOLUTE MAXIMUM RATINGS (Note 1)
V
CC
Voltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V
V
CC
Current (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . 30.0mA
OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±1.0A
OUT Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . 20.0µJ
Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . –0.3V to 6.3V
Power Dissipation at T
A
< +25°C (N or J Package) . . . . . 1.0W
Power Dissipation at T
A
< +25°C (D Package). . . . . . . . 0.65W
Power Dissipation at T
A
< +25°C (L Package) . . . . . . . 1.375W
Storage Temperature Range. . . . . . . . . . . . .
–
65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . +300°C
Note 1: Values beyond which damage may occur. All voltages
are with respect to GND. All currents are positive into
the specified terminal. Consult Unitrode databook for
information regarding thermal specifications and limita-
tions of packages.
Note 2: In normal operation V
CC
is powered through a current
limiting resistor. Absolute maximum of 12V applies
when V
CC
is driven from a low impedance source such
that I
CC
does not exceed 30mA (which includes gate
drive current requirement). The resistor should be
sized so that the V
CC
voltage, under operating condi-
tions is below 12V but above the turn off threshold.
CONNECTION DIAGRAMS
TSSOP-8 (Top View)
PW Package
REF
VCC
OUT
GND
1
2
3
4
COMP
FB
CS
RC
8
7
6
5
DIL-8, SOIC-8 (Top View)
J or N, D Package
COMP
FB
1
2
3
4
8
7
6
5
REF
VCC
OUT
GND
TEMPERATURE AND PACKAGE SELECTION
UCC180X
UCC280X
UCC380X
Temperature Range
–55°C to +125°C
–40°C to +85°C
0°C to +70°C
Available Packages
J, L
N, D, PW
N, D, PW
CS
RC
ORDERING INFORMATION
UCC
80
P ACKAGE
P RODUCT OP TION
TEMP ERATURE RANGE
LCC-20
(TOP VIEW)
L Package
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C
1
Comp
2
N/C
3-4
FB
5
N/C
6
CS
7
N/C
8-9
RC
10
N/C
11
PWR GND
12
GND
13
N/C
14
OUT
15
N/C
16
VCC
17
N/C
18-19
REF
20
2
UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for –55°C
≤
T
A
≤
+125°C for
UCC180x; –40°C
≤
T
A
≤
+85°C for UCC280x; 0°C
≤
T
A
≤
+70°C for UCC380x; V
CC
=10V (Note 3); RT=100k from REF to RC;
CT=330pF from RC to GND; 0.1 F capacitor from V
CC
to GND; 0.1 F capacitor from V
REF
to GND. T
A
=T
J
.
PARAMETER
TEST CONDITIONS
MIN
Reference Section
Output Voltage
Load Regulation
Line Regulation
T
J
=+25°C, I=0.2mA, UCCx800/1/2/4
T
J
=+25°C, I=0.2mA, UCCx803/5
0.2mA<I<5mA
T
J
=+25°C,
V
CC
=10V to Clamp (I
VCC
=25mA)
T
J
=–55°C to +125°C,
V
CC
=10V to Clamp (I
VCC
=25mA)
Total Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
Oscillator Section
Oscillator Frequency
Temperature Stability
Amplitude peak-to-peak
Oscillator Peak Voltage
Error Amplifier Section
Input Voltage
Input Bias Current
Open Loop Voltage Gain
COMP Sink Current
COMP Source Current
Gain Bandwidth Product
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Current Sense Section
Gain
Maximum Input Signal
Input Bias Current
CS Blank Time
Over-Current Threshold
COMP to CS Offset
CS=0V
(Note 5)
COMP=5V (Note 6)
1.10
0.9
1.65
1.0
100
1.55
0.90
1.80
1.1
200
150
1.68
1.35
1.10
0.9
1.65
1.0
100
1.55
0.90
1.80
1.1
200
150
1.68
1.35
V/V
V
nA
ns
V
V
UCCx800/2/3
UCCx801/4/5
COMP=0V
97
48
99
49
100
50
0
97
48
99
49
100
50
0
%
%
FB=2.7V, COMP=1.1V
FB=1.8V, COMP=REF–1.2V
(Note 9)
COMP=2.5V; UCCx800/1/2/4
COMP=2.0V; UCCx803/5
2.44
1.95
2.50
2.0
80
3.5
–0.5
2
–0.8
2.56
2.05
1
2.44
1.95
2.50
2.0
80
2.5
–0.5
2
–0.8
2.56
2.05
1
µ
A
UCC180X
UCC280X
TYP
MAX
MIN
UCC380X
TYP
MAX
5.075
4.06
25
1.9
2.1
4.88
3.90
5.00
4.00
130
5
–35
–5
40
26
2.25
46
31
2.5
2.40
2.45
–35
52
36
2.55
5.10
4.08
UNITS
4.925 5.00 5.075 4.925 5.00
3.94
4.00
10
4.06
30
1.9
2.5
4.88
3.90
5.00
4.00
130
5
–5
5.10
4.08
3.94
4.00
10
V
mV
mV/V
mV/V
V
V
µ
V
UCCx800/1/2/4 (Note 7)
UCCx803/5 (Note 7)
10Hz
≤
f
≤
10kHz, T
J
=+25°C (Note 9)
T
A
=+125°C, 1000 Hours (Note 9)
mV
mA
kHz
kHz
%
V
V
V
UCCx800/1/2/4 (Note 4)
UCCx803/5 (Note 4)
(Note 9)
40
26
2.25
46
31
2.5
2.40
2.45
52
36
2.55
–
1
60
0.3
–0.2
–
1
60
0.4
–0.2
dB
mA
mA
MHz
–
200
50
1.42
0.45
–
200
50
1.42
0.45
3
UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for –55°C
≤
T
A
≤
+125°C for
UCC180x; –40°C
≤
T
A
≤
+85°C for UCC280x; 0°C
≤
T
A
≤
+70°C for UCC380x; V
CC
=10V (Note 3); RT=100k from REF to RC;
CT=330pF from RC to GND; 0.1 F capacitor from V
CC
to GND; 0.1 F capacitor from V
REF
to GND. T
A
=T
J
.
PARAMETER
Output Section
OUT Low Level
I=20mA, all parts
I=200mA, all parts
I=50mA, VCC=5V, UCCx803/5
I=20mA, VCC=0V, all parts
OUT High V
SAT
(V
CC
-OUT)
Rise Time
Fall Time
Undervoltage Lockout Section
Start Threshold (Note 8)
UCCx800
UCCx801
UCCx802/4
UCCx803/5
Stop Threshold (Note 8)
UCCx1800
UCCx1801
UCCx802/4
UCCx803/5
Undervoltage Lockout Section (cont.)
Start to Stop Hysteresis
UCCx800
UCCx801
UCCx802/4
UCCx803/5
Soft Start Section
COMP Rise Time
Overall Section
Start-up Current
Operating Supply Current
VCC Internal Zener Voltage
V
CC
< Start Threshold
FB=0V, CS=0V
I
CC
=10mA (Note 8), (Note 10)
12
0.5
0.1
0.5
13.5
1.0
0.2
1.0
15
12
0.5
0.1
0.5
13.5
1.0
0.2
1.0
15
mA
mA
V
V
FB=1.8V, Rise from 0.5V to REF–1V
4
10
4
10
ms
0.12
1.6
3.5
0.2
0.3
2
4.2
0.5
0.48
2.4
5.1
0.8
0.12
1.6
3.5
0.2
0.3
2
4.2
0.5
0.48
2.4
5.1
0.8
V
V
V
V
6.6
8.6
11.5
3.7
6.3
6.8
7.6
3.2
7.2
9.4
12.5
4.1
6.9
7.4
8.3
3.6
7.8
10.2
13.5
4.5
7.5
8.0
9.0
4.0
6.6
8.6
11.5
3.7
6.3
6.8
7.6
3.2
7.2
9.4
12.5
4.1
6.9
7.4
8.3
3.6
7.8
10.2
13.5
4.5
7.5
8.0
9.0
4.0
V
V
V
V
V
V
V
V
I=–20mA, all parts
I=–200mA, all parts
I=–50mA,VCC=5V, UCCx803/5
C
L
=1nF
C
L
=1nF
0.1
0.35
0.15
0.7
0.15
1.0
0.4
41
44
0.4
0.90
0.40
1.2
0.40
1.9
0.9
70
75
0.1
0.35
0.15
0.7
0.15
1.0
0.4
41
44
0.4
0.90
0.40
1.2
0.40
1.9
0.9
70
75
V
V
V
V
V
V
V
ns
ns
TEST CONDITIONS
UCC180X
UCC280X
UCC380X
UNITS
VCC Internal Zener Voltage Minus UCCx802/4 (Note 8)
Start Threshold Voltage
Note 3: Adjust VCC above the start threshold before setting at 10V.
Note 4: Oscillator frequency for the UCCx800, UCCx802 and UCCx803 is the output frequency.
Oscillator frequency for the UCCx801, UCCx804 and UCCx805 is twice the output frequency.
∆
V
COMP
Note 5: Gain is defined by:
A
=
0
≤
V
CS
≤
0.8
V
.
∆
V
CS
Note 6: Parameter measured at trip point of latch with Pin 2 at 0V.
Note 7: Total Variation includes temperature stability and load regulation.
Note 8: Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another.
Note 9: Guaranteed by design. Not 100% tested in production.
Note 10: The device is fully operating in clamp mode as the forcing current is higher than the normal operating supply current.
4
京公网安备 11010802033920号
EEWORLD
