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UC2843A の電気的特性と機能

UC2843AのメーカーはON Semiconductorです、この部品の機能は「High Performance Current Mode Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC2843A
部品説明 High Performance Current Mode Controllers
メーカ ON Semiconductor
ロゴ ON Semiconductor ロゴ 




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UC2843A Datasheet, UC2843A PDF,ピン配置, 機能
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 (SOIC−14). The SOIC−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).
Features
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 SENSEFETProducts
Pb−Free Packages are Available
http://onsemi.com
8
1
14
1
PDIP−8
N SUFFIX
CASE 626
SOIC−14
D SUFFIX
CASE 751A
8
1
SOIC−8
D1 SUFFIX
CASE 751
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8 Vref
7 VCC
6 Output
5 GND
(Top View)
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
NC 6
RT/CT 7
14 Vref
13 NC
12 VCC
11 VC
10 Output
9 GND
8 Power Ground
(Top View)
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 8
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.
1 Publication Order Number:
UC3842A/D

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UC2843A pdf, ピン配列
UC3842A, UC3843A, UC2842A, UC2843A
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted.)
UC284XA
UC384XA
Characteristics
Symbol Min Typ Max Min Typ Max
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Line Regulation (VCC = 12 V to 25 V)
Load Regulation (IO = 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz,
TJ = 25°C)
Long Term Stability (TA = 125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
Frequency Change with Voltage (VCC = 12 V to 25 V)
Frequency Change with Temperature
TA = Tlow to Thigh
Vref
Regline
Regload
TS
Vref
Vn
S
ISC
fosc
Dfosc/DV
Dfosc/DT
4.95
4.9
− 30
47
46
5.0 5.05 4.9
2.0 20
3.0 25
0.2 −
− 5.1 4.82
50 −
5.0 −
− 85 − 180 − 30
52 57
− 60
0.2 1.0
5.0 −
47
46
5.0 5.1
2.0 20
3.0 25
0.2 −
− 5.18
50 −
5.0 −
− 85 − 180
52 57
− 60
0.2 1.0
5.0 −
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (Vosc = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh
Vosc − 1.6 − − 1.6 −
Idischg
7.5 8.4 9.3 7.5 8.4 9.3
7.2 − 9.5 7.2 − 9.5
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB 2.45 2.5 2.55 2.42 2.5 2.58
Input Bias Current (VFB = 2.7 V)
IIB − −0.1 −1.0 − −0.1 −2.0
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
AVOL 65 90 − 65 90 −
Unity Gain Bandwidth (TJ = 25°C)
BW 0.7 1.0 − 0.7 1.0 −
Power Supply Rejection Ratio (VCC = 12 V to 25 V) PSRR 60 70 − 60 70 −
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
ISink 2.0 12 − 2.0 12 −
ISource
−0.5 −1.0
−0.5 −1.0
Output Voltage Swing
High State (RL = 15 k to ground, VFB = 2.3 V)
Low State (RL = 15 k to Vref, VFB = 2.7 V)
VOH 5.0 6.2 − 5.0 6.2 −
VOL − 0.8 1.1 − 0.8 1.1
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
−25°C for UC2842A, UC2843A
Thigh = +70°C for UC3842A, UC3843A
+85°C for UC2842A, UC2843A
Unit
V
mV
mV
mV/°C
V
mV
mV
mA
kHz
%
%
V
mA
V
mA
dB
MHz
dB
mA
V
http://onsemi.com
3


3Pages


UC2843A 電子部品, 半導体
UC3842A, UC3843A, UC2842A, UC2843A
100 0
VCC = 15 V
80
Gain
VO = 2.0 V to 4.0 V
RL = 100 K
30
TA = 25°C
60 60
40 90
Phase
20 120
0 150
− 20
10
100 1.0 k 10 k 100 k 1.0 M
f, FREQUENCY (Hz)
Figure 8. Error Amp Open Loop Gain and
Phase versus Frequency
180
10 M
1.2
VCC = 15 V
1.0
0.8 TA = 25°C
0.6
TA = 125°C
0.4 TA = −55°C
0.2
0
0 2.0 4.0 6.0 8.0
VO, ERROR AMP OUTPUT VOLTAGE (V)
Figure 9. Current Sense Input Threshold
versus Error Amp Output Voltage
0
−4.0
−8.0
−12
−16
−20
−24
0
VCC = 15 V
TA = 125°C
TA = 55°C
TA = 25°C
20 40 60 80 100
Iref, REFERENCE SOURCE CURRENT (mA)
Figure 10. Reference Voltage Change
versus Source Current
120
110
VCC = 15 V
RL 0.1 W
90
70
50
−55 −25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 11. Reference Short Circuit Current
versus Temperature
VCC = 15 V
IO = 1.0 mA to 20 mA
TA = 25°C
VCC = 12 V to 25 V
TA = 25°C
2.0 ms/DIV
Figure 12. Reference Load Regulation
2.0 ms/DIV
Figure 13. Reference Line Regulation
http://onsemi.com
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