UC3842A, UC3843A,
UC2842A, UC2843A
High Performance
Current Mode Controllers
The UC3842A, UC3843A series of high performance fixed frequency current mode controllers are specifically designed for off±line and dc±to±dc converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle±by±cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8±pin dual±in±line plastic package as well as the 14±pin plastic surface mount (SO±14). The SO±14 package has separate power and ground pins for the totem pole output stage.
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally suited for off±line converters. The UCX843A is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
•Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
•Current Mode Operation to 500 kHz
•Automatic Feed Forward Compensation
•Latching PWM for Cycle±By±Cycle Current Limiting
•Internally Trimmed Reference with Undervoltage Lockout
•High Current Totem Pole Output
•Undervoltage Lockout with Hysteresis
•Low Startup and Operating Current
•Direct Interface with ON Semiconductor SENSEFET Products
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PDIP±8 |
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N SUFFIX |
8 |
CASE 626 |
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1 |
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SO±14 |
14 |
D SUFFIX |
CASE 751A |
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1 |
8 |
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SO±8 |
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D1 SUFFIX |
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CASE 751 |
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PIN CONNECTIONS
Compensation |
1 |
8 |
Vref |
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Voltage Feedback |
2 |
7 |
VCC |
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Current Sense |
3 |
6 |
Output |
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RT/CT |
4 |
5 |
Gnd |
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Compensation |
1 |
14 |
Vref |
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NC |
2 |
13 |
NC |
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Voltage Feedback |
3 |
12 |
VCC |
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NC |
4 |
11 |
VC |
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Current Sense |
5 |
10 |
Output |
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NC |
6 |
9 |
Gnd |
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RT/CT |
7 |
8 |
Power Ground |
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(Top View) |
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ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 15 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 16 of this data sheet.
Semiconductor Components Industries, LLC, 2001 |
1 |
Publication Order Number: |
October, 2001 ± Rev. 3 |
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UC3842A/D |
UC3842A, UC3843A, UC2842A, UC2843A
Vref
8(14)
RTCT
4(7)
Voltage
Feedback Input
2(3) Output
Compensation
1(1)
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VCC |
7(12) |
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5.0V |
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VCC |
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Reference |
Undervoltage |
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Lockout |
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R |
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R |
Vref |
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Undervoltage |
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Lockout
Oscillator
Latching
PWM
+
-
Error Amplifier
Gnd 
5(9)
Pin numbers in parenthesis are for the D suffix SO-14 package.
VC
7(11)
Output
6(10)
Power
Ground 5(8)
Current
Sense
3(5) Input
Figure 1. Simplified Block Diagram
MAXIMUM RATINGS
Rating |
Symbol |
Value |
Unit |
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Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) |
VCC, VC |
30 |
V |
Total Power Supply and Zener Current |
(ICC + IZ) |
30 |
mA |
Output Current, Source or Sink (Note 1) |
IO |
1.0 |
A |
Output Energy (Capacitive Load per Cycle) |
W |
5.0 |
μJ |
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Current Sense and Voltage Feedback Inputs |
Vin |
± 0.3 to + 5.5 |
V |
Error Amp Output Sink Current |
IO |
10 |
mA |
Power Dissipation and Thermal Characteristics |
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D Suffix, Plastic Package |
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Maximum Power Dissipation @ TA = 25°C |
PD |
862 |
mW |
Thermal Resistance, Junction±to±Air |
RθJA |
145 |
°C/W |
N Suffix, Plastic Package |
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Maximum Power Dissipation @ TA = 25°C |
PD |
1.25 |
W |
Thermal Resistance, Junction±to±Air |
RθJA |
100 |
°C/W |
Operating Junction Temperature |
TJ |
+ 150 |
°C |
Operating Ambient Temperature |
TA |
0 to + 70 |
°C |
UC3842A, UC3843A |
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UC2842A, UC2843A |
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± 25 to + 85 |
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Storage Temperature Range |
Tstg |
± 65 to + 150 |
°C |
1. Maximum Package power dissipation limits must be observed.
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2
UC3842A, UC3843A, UC2842A, UC2843A
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh |
[Note 3], |
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unless otherwise noted.) |
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UC284XA |
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UC384XA |
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Characteristics |
Symbol |
Min |
Typ |
Max |
Min |
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Typ |
Max |
Unit |
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REFERENCE SECTION |
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Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) |
Vref |
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4.95 |
5.0 |
5.05 |
4.9 |
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5.0 |
5.1 |
V |
Line Regulation (VCC = 12 V to 25 V) |
Regline |
± |
2.0 |
20 |
± |
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2.0 |
20 |
mV |
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Load Regulation (IO = 1.0 mA to 20 mA) |
Regload |
± |
3.0 |
25 |
± |
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3.0 |
25 |
mV |
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Temperature Stability |
TS |
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± |
0.2 |
± |
± |
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0.2 |
± |
mV/°C |
Total Output Variation over Line, Load, Temperature |
Vref |
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4.9 |
± |
5.1 |
4.82 |
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± |
5.18 |
V |
Output Noise Voltage (f = 10 Hz to 10 kHz, |
Vn |
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± |
50 |
± |
± |
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50 |
± |
μV |
TJ = 25°C) |
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Long Term Stability (TA = 125°C for 1000 Hours) |
S |
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± |
5.0 |
± |
± |
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5.0 |
± |
mV |
Output Short Circuit Current |
ISC |
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± 30 |
± 85 |
± 180 |
± 30 |
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± 85 |
± 180 |
mA |
OSCILLATOR SECTION |
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Frequency |
fosc |
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kHz |
TJ = 25°C |
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47 |
52 |
57 |
47 |
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52 |
57 |
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TA = Tlow to Thigh |
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46 |
± |
60 |
46 |
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± |
60 |
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Frequency Change with Voltage (VCC = 12 V to 25 V) |
fosc/ |
V |
± |
0.2 |
1.0 |
± |
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0.2 |
1.0 |
% |
Frequency Change with Temperature |
fosc/ |
T |
± |
5.0 |
± |
± |
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5.0 |
± |
% |
TA = Tlow to Thigh |
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Oscillator Voltage Swing (Peak±to±Peak) |
Vosc |
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± |
1.6 |
± |
± |
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1.6 |
± |
V |
Discharge Current (Vosc = 2.0 V) |
Idischg |
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mA |
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TJ = 25°C |
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7.5 |
8.4 |
9.3 |
7.5 |
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8.4 |
9.3 |
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TA = Tlow to Thigh |
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7.2 |
± |
9.5 |
7.2 |
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± |
9.5 |
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ERROR AMPLIFIER SECTION |
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Voltage Feedback Input (VO = 2.5 V) |
VFB |
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2.45 |
2.5 |
2.55 |
2.42 |
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2.5 |
2.58 |
V |
Input Bias Current (VFB = 2.7 V) |
IIB |
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± |
±0.1 |
±1.0 |
± |
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±0.1 |
±2.0 |
μA |
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V) |
AVOL |
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65 |
90 |
± |
65 |
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90 |
± |
dB |
Unity Gain Bandwidth (TJ = 25°C) |
BW |
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0.7 |
1.0 |
± |
0.7 |
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1.0 |
± |
MHz |
Power Supply Rejection Ratio (VCC = 12 V to 25 V) |
PSRR |
60 |
70 |
± |
60 |
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70 |
± |
dB |
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Output Current |
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mA |
Sink (VO = 1.1 V, VFB = 2.7 V) |
ISink |
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2.0 |
12 |
± |
2.0 |
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12 |
± |
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Source (VO = 5.0 V, VFB = 2.3 V) |
ISource |
±0.5 |
±1.0 |
± |
±0.5 |
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±1.0 |
± |
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Output Voltage Swing |
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V |
High State (RL = 15 k to ground, VFB = 2.3 V) |
VOH |
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5.0 |
6.2 |
± |
5.0 |
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6.2 |
± |
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Low State (RL = 15 k to Vref, VFB = 2.7 V) |
VOL |
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± |
0.8 |
1.1 |
± |
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0.8 |
1.1 |
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2.Adjust VCC above the Startup threshold before setting to 15 V.
3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for UC3842A, UC3843A |
Thigh = +70°C for UC3842A, UC3843A |
±25°C for UC2842A, UC2843A |
+85°C for UC2842A, UC2843A |
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3
UC3842A, UC3843A, UC2842A, UC2843A
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 4], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh |
[Note 5], |
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unless otherwise noted.) |
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UC284XA |
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UC384XA |
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Characteristics |
Symbol |
Min |
Typ |
Max |
Min |
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Typ |
Max |
Unit |
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CURRENT SENSE SECTION |
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Current Sense Input Voltage Gain (Notes 6 & 7) |
AV |
2.85 |
3.0 |
3.15 |
2.85 |
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3.0 |
3.15 |
V/V |
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Maximum Current Sense Input Threshold (Note 6) |
Vth |
0.9 |
1.0 |
1.1 |
0.9 |
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1.0 |
1.1 |
V |
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Power Supply Rejection Ratio |
PSRR |
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dB |
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VCC = 12 to 25 V (Note 6) |
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70 |
± |
± |
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70 |
± |
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Input Bias Current |
IIB |
± |
±2.0 |
±10 |
± |
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±2.0 |
±10 |
μA |
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Propagation Delay (Current Sense Input to Output) |
tPLH(in/out) |
± |
150 |
300 |
± |
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150 |
300 |
ns |
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OUTPUT SECTION |
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Output Voltage |
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V |
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Low State |
(ISink = 20 mA) |
VOL |
± |
0.1 |
0.4 |
± |
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0.1 |
0.4 |
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(ISink = 200 mA) |
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± |
1.6 |
2.2 |
± |
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1.6 |
2.2 |
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High State |
(ISink = 20 mA) |
VOH |
13 |
13.5 |
± |
13 |
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13.5 |
± |
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(ISink = 200 mA) |
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12 |
13.4 |
± |
12 |
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13.4 |
± |
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Output Voltage with UVLO Activated |
VOL(UVLO) |
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V |
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VCC = 6.0 V, ISink = 1.0 mA |
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0.1 |
1.1 |
± |
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0.1 |
1.1 |
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Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C) |
tr |
± |
50 |
150 |
± |
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50 |
150 |
ns |
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Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C) |
tf |
± |
50 |
150 |
± |
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50 |
150 |
ns |
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UNDERVOLTAGE LOCKOUT SECTION |
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Startup Threshold |
Vth |
15 |
16 |
17 |
14.5 |
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16 |
17.5 |
V |
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UCX843A |
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7.8 |
8.4 |
9.0 |
7.8 |
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8.4 |
9.0 |
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Minimum Operating Voltage After Turn±On |
VCC(min) |
9.0 |
10 |
11 |
8.5 |
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10 |
11.5 |
V |
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UCX843A |
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7.0 |
7.6 |
8.2 |
7.0 |
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7.6 |
8.2 |
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PWM SECTION |
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Duty Cycle |
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% |
Maximum |
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DCmax |
94 |
96 |
± |
94 |
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96 |
± |
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Minimum |
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DCmin |
± |
± |
0 |
± |
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0 |
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TOTAL DEVICE |
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Power Supply Current (Note 4) |
ICC |
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mA |
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Startup: |
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(VCC = 6.5 V for UCX843A, |
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0.5 |
1.0 |
± |
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0.5 |
1.0 |
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14 V for UCX842A) Operating |
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12 |
17 |
± |
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12 |
17 |
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Power Supply Zener Voltage (ICC = 25 mA) |
VZ |
30 |
36 |
± |
30 |
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36 |
± |
V |
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4.Adjust VCC above the Startup threshold before setting to 15 V.
5.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
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Tlow = 0°C for UC3842A, UC3843A |
Thigh = +70°C for UC3842A, UC3843A |
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±25°C for UC2842A, UC2843A |
+85°C for UC2842A, UC2843A |
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6. |
This parameter is measured at the latch trip point with VFB = 0 V. |
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7. |
Comparator gain is defined as: AV |
V Output Compensation |
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V Current Sense Input
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4
UC3842A, UC3843A, UC2842A, UC2843A
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80 |
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50 |
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(kΩ) |
20 |
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RESISTOR |
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8.0 |
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5.0 |
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,TIMING |
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2.0 |
VCC = 15 V |
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T |
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R |
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TA = 25°C |
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0.8 |
10 k |
20 k |
50 k |
100 k |
200 k |
500 k |
1.0 M |
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fOSC, OSCILLATOR FREQUENCY (Hz)
Figure 2. Timing Resistor versus
Oscillator Frequency
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100 |
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DEADTIME |
50 |
VCC = 15 V |
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TA = 25°C |
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OUTPUT |
20 |
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10 |
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DT, PERCENT |
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5.0 |
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2.0 |
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% |
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1.0 |
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10 k |
20 k |
50 k |
100 k |
200 k |
500 k |
1.0 M |
fOSC, OSCILLATOR FREQUENCY (Hz)
Figure 3. Output Deadtime versus
Oscillator Frequency
I dischg , DISCHARGE CURRENT (mA)
9.0
VCC = 15 V
VOSC = 2.0 V
8.5
8.0
7.5
7.0 |
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-55 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Oscillator Discharge Current
versus Temperature
(%) |
100 |
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CYCLE |
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VCC = 15 V |
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TA |
= 25°C |
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90 |
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CT |
= 3.3 nF |
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DUTY |
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80 |
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Idischg |
= 7.2 mA |
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OUTPUT |
70 |
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MAXIMUM, |
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50 |
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Idischg |
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= 9.5 mA |
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max |
60 |
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D |
40 |
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800 |
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1.0 k |
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2.0 k |
3.0 k 4.0 k |
6.0 k 8.0 k |
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RT, TIMING RESISTOR (Ω) |
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Figure 5. Maximum Output Duty Cycle
versus Timing Resistor
2.55V
2.5V
2.45V
VCC = 15 V
AV = -1.0
TA = 25°C
20 mV/DIV
0.5 μs/DIV
Figure 6. Error Amp Small Signal
Transient Response
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VCC = 15 V |
3.0 V |
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AV = -1.0 |
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TA = 25°C |
2.5 V |
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2.0 V |
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0.1 |
μs/DIV |
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Figure 7. Error Amp Large Signal
Transient Response
200 mV/DIV
http://onsemi.com
5
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UC3842A, UC3843A, UC2842A, UC2843A |
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(dB) |
100 |
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0 |
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(V) |
1.2 |
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VCC = 15 V |
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φ PHASEEXCESS, (DEGREES) |
SENSECURRENTINPUT THRESHOLD |
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VCC = 15 V |
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VOL |
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VO = 2.0 V to 4.0 V |
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GAIN |
80 |
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Gain |
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RL = 100 K |
30 |
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1.0 |
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VOLTAGE |
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TA = 25°C |
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60 |
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60 |
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0.8 |
TA = 25°C |
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LOOP |
40 |
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90 |
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0.6 |
TA = 125°C |
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Phase |
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, OPEN |
20 |
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120 |
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0.4 |
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TA = -55°C |
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0 |
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150 |
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0.2 |
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A |
- 20 |
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180 |
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th |
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, |
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10 |
100 |
1.0 k |
10 k |
100 k |
1.0 M |
10 M |
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V |
0 |
2.0 |
4.0 |
6.0 |
8.0 |
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0 |
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f, FREQUENCY (Hz) |
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VO, ERROR AMP OUTPUT VOLTAGE (V) |
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Figure 8. Error Amp Open Loop Gain and |
Figure 9. Current Sense Input Threshold |
Phase versus Frequency |
versus Error Amp Output Voltage |
, REFERENCE VOLTAGE CHANGE(mV) |
0 |
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SHORT CIRCUIT CURRENT(mA) |
110 |
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VCC = 15 V |
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VCC = 15 V |
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-4.0 |
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RL ≤ 0.1 Ω |
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-8.0 |
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90 |
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-12 |
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-16 |
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TA = 125°C |
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TA = 55°C |
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70 |
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-20 |
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TA = 25°C |
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ref |
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REFERENCE |
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V |
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, |
50 |
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-24 |
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SC |
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0 |
20 |
40 |
60 |
80 |
100 |
120 |
-55 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
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I |
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Iref, REFERENCE SOURCE CURRENT (mA) |
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TA, AMBIENT TEMPERATURE (°C) |
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|||||||
Figure 10. Reference Voltage Change |
Figure 11. Reference Short Circuit Current |
versus Source Current |
versus Temperature |
OUTPUT, CHANGEVOLTAGE mV/DIV)(2.0
O V
VCC = 15 V
IO = 1.0 mA to 20 mA
TA = 25°C
2.0 ms/DIV
Figure 12. Reference Load Regulation
OUTPUT, CHANGEVOLTAGE mV/DIV)(2.0
O V
VCC = 12 V to 25 V
TA = 25°C
2.0 ms/DIV
Figure 13. Reference Line Regulation
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6
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