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Datasheet> All Categories > Power/power management> The power supply circuit> UC2842AD1013TR
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UC2842AD1013TR

Description
1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8
CategoryPower/power management    The power supply circuit   
File Size127KB，15 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
Environmental Compliance
Download Datasheet Parametric Compare View All

UC2842AD1013TR Overview

1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8

UC2842AD1013TR Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerSTMicroelectronics
Parts packaging codeSOIC
package instructionSO-8
Contacts8
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage11.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G8
length4.9 mm
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-25 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
Temperature levelOTHER
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
width3.9 mm

UC2842AD1013TR Preview

®
UC2842A/3A/4A/5A
UC3842A/3A/4A/5A
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
.
.
.
.
.
.
.
.
.
TRIMMED OSCILLATOR DISCHARGE CUR-
RENT
CURRENT MODE OPERATION TO 500kHz
AUTOMATIC FEED FORWARD COMPENSA-
TION
LATCHING PWM FOR CYCLE-BY-CYCLE
CURRENT LIMITING
INTERNALLY TRIMMED REFERENCE WITH
UNDERVOLTAGE LOCKOUT
HIGH CURRENT TOTEM POLE OUTPUT
UNDERVOLTAGE LOCKOUT WITH HYSTER-
ESIS
LOW START-UP CURRENT (< 0.5mA)
DOUBLE PULSE SUPPRESSION
Minidip
SO8
DESCRIPTION
TheUC384xA family ofcontrolICs providesthe nec-
essary features to implement off-line or DC to DC
fixed frequency current mode control schemes with
a minimal external parts count. Internally imple-
mented circuits include a trimmed oscillator for pre-
cise DUTY CYCLE CONTROL under voltage lock-
outfeaturingstart-up current less than0.5mA,a pre-
cision reference trimmed for accuracy at the error
amp input, logicto insure latched operation,a PWM
comparatorwhich alsoprovidescurrent limit control,
and a totem pole output stage designed to source
or sink high peakcurrent. The outputstage, suitable
for driving N-Channel MOSFETs, is low in the off-
state.
Differences between members of this family are the
under-voltagelockout thresholds and maximum duty
cycle ranges. The UC3842A and UC3844A have
UVLO thresholds of 16V (on) and 10V (off), ideally
suitedoff-lineapplicationsThecorrespondingthresh-
olds for the UC3843A and UC3845A are 8.5 V and
7.9V. The UC3842A and UC3843A can operate to
dutycycles approaching100%.A range of the zeroto
< 50 % is obtainedby theUC3844Aand UC3845Aby
the addition of an internal toggle flip flopwhich blanks
the output off every otherclock cycle.
BLOCK DIAGRAM
(toggle flip flop used only in UC3844A and UC3845A)
Vi
7
34V
GROUND
5
UVLO
S/R
5V
REF
INTERNAL
BIAS
VREF GOOD
LOGIC
RT/CT
4
OSC
ERROR AMP.
2R
R
1V
T
8
VREF
5V 50mA
2.50V
6
OUTPUT
VFB
COMP
CURRENT
SENSE
2
1
3
+
-
S
R
CURRENT
SENSE
COMPARATOR
PWM
LATCH
UC3842A
D95IN331
March 1999
1/15
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
ABSOLUTE MAXIMUM RATINGS
Symbol
V
i
V
i
I
O
E
O
Parameter
Supply Voltage (low impedance source)
Supply Voltage (Ii < 30mA)
Output Current
Output Energy (capacitive load)
Analog Inputs (pins 2, 3)
Error Amplifier Output Sink Current
P
tot
P
tot
T
stg
T
J
T
L
Power Dissipation at T
amb
≤
25
°
C (Minidip)
Power Dissipation at Tamb
≤
25
°
C (SO8)
Storage Temperature Range
Junction Operating Temperature
Lead Temperature (soldering 10s)
Valu e
30
Self Limiting
±
1
5
– 0.3 to 5.5
10
1.25
800
– 65 to 150
– 40 to 150
300
A
µ
J
V
mA
W
mW
°
C
°C
°
C
Un it
V
* All voltages are with respect to pin 5, all currents are positive into the specified terminal.
PIN CONNECTION
(top view)
Minidip/SO8
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
D95IN332
8
7
6
5
V
REF
Vi
OUTPUT
GROUND
PIN FUNCTIONS
No
1
2
3
4
5
6
7
8
Function
COMP
V
FB
I
SENSE
R
T
/C
T
GROUND
OUTPUT
V
CC
V
ref
Description
This pin is the Error Amplifier output and is made available for loop compensation.
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
The oscillator frequency and maximum Output duty cycle are programmed by connecting
resistor R
T
to Vref and cpacitor C
T
to ground. Operation to 500kHz is possible.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced
and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor C
T
through resistor R
T
.
ORDERING NUMBERS
SO8
UC2842AD1;
UC2843AD1;
UC2844AD1;
UC2845AD1;
UC3842AD1
UC3843AD1
UC3844AD1
UC3845AD1
Minidip
UC2842AN;
UC2843AN;
UC2844AN;
UC2845AN;
UC3842AN
UC3843AN
UC3844AN
UC3845AN
2/15
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
THERMAL DATA
Symbo l
R
th j-amb
Description
Thermal Resistance Junction-ambient.
max.
Minid ip
100
SO 8
150
Unit
°
C/W
ELECTRICAL CHARACTERISTICS
( [note 1] Unless otherwise stated, these specifications apply for
-25 < T
amb
< 85°C for UC284XA; 0 < T
amb
< 70°C for UC384XA; V
i
= 15V (note 5); R
T
= 10K; C
T
= 3.3nF)
Symbo l
Parameter
T est Cond it ion s
UC284XA
UC384XA
Min. T yp. Max. Min. Typ . Max.
4.95 5.00 5.05 4.90 5.00 5.10
2
3
0.2
4.9
50
5
-30
T
j
= 25
°
C
T
A
= T
low
to T
high
(peak to peak)
47
–
–
–
7.8
25
-30
47
–
–
–
7.8
5.1
4.82
50
5
25
20
25
2
3
0.2
5.18
20
25
Uni t
REFERENCE SECTION
V
REF
∆V
REF
∆V
REF
Output Voltage
Line Regulation
Load Regulation
T
j
= 25°C I
o
= 1mA
12V
≤
V
i
≤
25V
1
≤
I
o
≤
20mA
(Note 2)
Line, Load, Temperature
10Hz
≤
f
≤
10KHz T
j
= 25
°
C
(note 2)
T
amb
=
(note 2)
125
°
C,
1000Hrs
V
mV
mV
mV/
°
C
V
µ
V
mV
mA
KHz
%
%
V
mA
V
µA
dB
MHz
dB
mA
mA
V
1.1
V
∆
V
REF
/
∆
T Temperature Stability
Total Output Variation
e
N
Output Noise Voltage
Long Term Stability
I
SC
Output Short Circuit
-100 -180
52
0.2
5
1.6
8.3
57
1
–
–
8.8
-100 -180
52
0.2
5
1.6
8.3
57
1
–
–
8.8
OSCILLATOR SECTION
f
OSC
Frequency
∆
f
OSC
/
∆
V
∆
f
OSC
/
∆
T
V
OSC
I
dischg
V
2
I
b
BW
PSRR
I
o
I
o
Frequency Change with Temp.
Oscillator Voltage Swing
Frequency Change with Volt. V
CC
= 12V to 25V
Discharge Current (V
OSC
=2V) T
J
= 25°C
Input Voltage
Input Bias Current
A
VOL
Unity Gain Bandwidth
Power Supply Rejec. Ratio
Output Sink Current
Output Source Current
V
OUT
High
V
OUT
Low
V
PIN1
= 2.5V
V
FB
= 5V
2V
≤
V
o
≤
4V
T
J
= 25°C
12V
≤
V
i
≤
25V
V
PIN2
= 2.7V V
PIN1
= 1.1V
V
PIN2
= 2.3V V
PIN1
= 5V
V
PIN2
= 2.3V;
R
L
= 15K
Ω
to Ground
V
PIN2
= 2.7V;
R
L
= 15K
Ω
to Pin 8
(note 3 & 4)
V
PIN1
= 5V (note 3)
12
≤
V
i
≤
25V (note 3)
ERROR AMP SECTION
2.45 2.50 2.55 2.42 2.50 2.58
-0.1
65
0.7
60
2
-0.5
5
90
1
70
12
-1
6.2
0.8
1.1
-1
65
0.7
60
2
-0.5
5
-0.1
90
1
70
12
-1
6.2
0.8
-2
CURRENT SENSE SECTION
G
V
Gain
V
3
SVR
I
b
Maximum Input Signal
Supply Voltage Rejection
Input Bias Current
Delay to Output
2.85
0.9
3
1
70
-2
150
3.15 2.85
1.1
-10
300
0.9
3
1
70
-2
150
3.15
1.1
-10
300
V/V
V
dB
µ
A
ns
3/15
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
ELECTRICAL CHARACTERISTICS
(continued)
Symbo l
OUTPUT SECTION
V
OL
V
OH
V
OLS
t
r
t
f
Output Low Level
I
SINK
= 20mA
I
SINK
= 200mA
Output High Level
I
SOURCE
= 20mA
I
SOURCE
= 200mA
UVLO Saturation
Rise Time
Fall Time
Start Threshold
V
CC
= 6V; I
SINK
= 1mA
T
j
= 25
°
C C
L
= 1nF (2)
T
j
= 25°C C
L
= 1nF (2)
X842A/4A
X843A/5A
Min Operating Voltage
After Turn-on
PWM SECTION
Maximum Duty Cycle
X842A/3A
X844A/5A
Minimum Duty Cycle
TOTAL STANDBY CURRENT
I
st
I
i
V
iz
Start-up Current
V
i
= 6.5V for UCX843A/45A
V
i
= 14V for UCX842A/44A
Operating Supply Current
Zener Voltage
V
PIN2
= V
PIN3
= 0V
I
i
= 25mA
30
0.3
0.3
12
36
0.5
0.5
17
30
0.3
0.3
12
36
0.5
0.5
17
mA
mA
mA
V
94
47
96
48
100
50
0
94
47
96
48
100
50
0
%
%
%
X842A/4A
X843A/5A
15
7.8
9
7.0
13
12
0.1
1.6
13.5
13.5
0.7
50
50
16
8.4
10
7.6
1.2
150
150
17
9.0
11
8.2
14.5
7.8
8.5
7.0
0.4
2.2
13
12
0.1
1.6
13.5
13.5
0.7
50
50
16
8.4
10
7.6
1.2
150
150
17.5
9.0
11.5
8.2
0.4
2.2
V
V
V
V
V
ns
ns
V
V
V
V
Parameter
T est Cond itions
UC284XA
UC384XA
Min . Typ . Max. Min. T yp. Max.
Un it
UNDER-VOLTAGE LOCKOUT SECTION
Notes :
1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain T
j
as
close to T
amb
as possible.
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with V
PIN2
= 0.
4. Gain defined as :
∆
V
PIN1
A=
; 0
≤
V
PIN3
≤
0.8 V
∆
V
PIN3
5. Adjust V
i
above the start threshold before setting at 15 V.
4/15
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
Figure 1:
Open Loop Test Circuit.
V
REF
4.7KΩ
2N2222
100KΩ
ERROR AMP.
ADJUST
4.7KΩ
COMP
V
FB
1KΩ
I
SENSE
ADJUST
5KΩ
I
SENSE
R
T
/C
T
R
T
V
REF
1
2
8
7
V
i
0.1µF
OUTPUT
GROUND
1W
1KΩ
OUTPUT
A
0.1µF
V
i
UC3842A
3
4
6
5
C
T
D95IN343
GROUND
High peak currents associated with capacitive loads
necessitate careful grounding techniques. Timing
and bypass capacitors should be connected close
to pin 5 in a single point ground. The transistor and
5 KΩ potentiometerareusedto samplethe oscillator
waveform and apply an adjustable ramp to pin 3.
Figure 2:
Oscillator Frequency vs Timing Resis-
tance
f
o
(Hz)
D96IN362
Figure 3:
Maximum Duty Cycle vs Timing Resis-
tor
f
o
(Hz)
D96IN363
80
1M
CT
=
1nF
47
0
pF
60
100K
2.2
nF
4.7
nF
40
10K
20
1K
300
1K
3K
10K
30K
R
T
(Ω)
0
300
1K
3K
10K
30K
R
T
(Ω)
5/15
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UC2842AD1013TR Related Products

UC2842AD1013TR UC3842AD1013TR UC3845AD1013TR
Description 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8
Is it Rohs certified? conform to conform to conform to
Maker STMicroelectronics STMicroelectronics STMicroelectronics
Parts packaging code SOIC SOIC SOIC
package instruction SO-8 SO-8 SOP,
Contacts 8 8 8
Reach Compliance Code compliant compliant compliant
ECCN code EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 30 V 30 V 30 V
Minimum input voltage 11.5 V 11.5 V 8.2 V
Nominal input voltage 15 V 15 V 15 V
JESD-30 code R-PDSO-G8 R-PDSO-G8 R-PDSO-G8
length 4.9 mm 4.9 mm 4.9 mm
Number of functions 1 1 1
Number of terminals 8 8 8
Maximum operating temperature 85 °C 70 °C 70 °C
Maximum output current 1 A 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP SOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Certification status Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 1.75 mm 1.75 mm
surface mount YES YES YES
Switch configuration SINGLE SINGLE SINGLE
Maximum switching frequency 500 kHz 500 kHz 500 kHz
Temperature level OTHER COMMERCIAL COMMERCIAL
Terminal form GULL WING GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm 1.27 mm
Terminal location DUAL DUAL DUAL
width 3.9 mm 3.9 mm 3.9 mm

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