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UC2845BD Datasheet(PDF) 3 Page - STMicroelectronics

Part # UC2845BD
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ELECTRICAL CHARACTERISTICS ( [note 1] Unless otherwise stated, these specifications apply for
-25 < Tamb <85
°C for UC284XB; 0 < Tamb <70°C for UC384XB; Vi = 15V (note 5); RT = 10K; CT = 3.3nF)
Symbol
Parameter
Test Cond it ions
UC284XB
UC384XB
Uni t
Min. Typ. Max. Min. Typ. Max.
REFERENCE SECTION
VREF
Output Voltage
Tj =25
°CIo = 1mA
4.95
5.00
5.05
4.90
5.00
5.10
V
∆VREF
Line Regulation
12V
≤ Vi ≤ 25V
220
2
20
mV
∆VREF
Load Regulation
1
≤ Io ≤ 20mA
325
3
25
mV
∆VREF/∆T Temperature Stability
(Note 2)
0.2
0.2
mV/
°C
Total Output Variation
Line, Load, Temperature
4.9
5.1
4.82
5.18
V
eN
Output Noise Voltage
10Hz
≤ f ≤ 10KHz Tj =25°C
(note 2)
50
50
µV
Long Term Stability
Tamb
=
125
°C, 1000Hrs
(note 2)
525
5
25
mV
ISC
Output Short Circuit
-30
-100 -180
-30
-100
-180
mA
OSCILLATOR SECTION
fOSC
Frequency
Tj =25
°C
TA =Tlow to Thigh
TJ =25°C(RT =6.2k, CT =1nF)
49
48
225
52
250
55
56
275
49
48
225
52
250
55
56
275
KHz
KHz
KHz
∆fOSC/∆V Frequency Change with Volt. VCC = 12V to 25V
0.2
1
0.2
1
%
∆fOSC/∆T Frequency Change with Temp. TA =Tlow to Thigh
–1
––
0.5
%
VOSC
Oscillator Voltage Swing
(peak to peak)
1.6
1.6
V
Idischg
Discharge Current (VOSC =2V) TJ =25°C
TA =Tlow to Thigh
7.8
7.5
8.3
8.8
8.8
7.8
7.6
8.3
8.8
8.8
mA
mA
ERROR AMP SECTION
V2
Input Voltage
VPIN1 = 2.5V
2.45
2.50
2.55
2.42
2.50
2.58
V
Ib
Input Bias Current
VFB = 5V
-0.1
-1
-0.1
-2
µA
AVOL
2V
≤ Vo ≤ 4V
65
90
65
90
dB
BW
Unity Gain Bandwidth
TJ =25°C
0.7
1
0.7
1
MHz
PSRR
Power Supply Rejec. Ratio
12V
≤ Vi ≤ 25V
60
70
60
70
dB
Io
Output Sink Current
VPIN2 = 2.7V
VPIN1 = 1.1V
2
12
2
12
mA
Io
Output Source Current
VPIN2 = 2.3V VPIN1 = 5V
-0.5
-1
-0.5
-1
mA
VOUT High
VPIN2 = 2.3V;
RL = 15K
Ω to Ground
5
6.2
5
6.2
V
VOUT Low
VPIN2 = 2.7V;
RL = 15K
Ω to Pin 8
0.8
1.1
0.8
1.1
V
CURRENT SENSE SECTION
GV
Gain
(note 3 & 4)
2.85
3
3.15
2.85
3
3.15
V/V
V3
Maximum Input Signal
VPIN1 = 5V (note 3)
0.9
1
1.1
0.9
1
1.1
V
SVR
Supply Voltage Rejection
12
≤ Vi ≤ 25V (note 3)
70
70
dB
Ib
Input Bias Current
-2
-10
-2
-10
µA
Delay to Output
150
300
150
300
ns
THERMAL DATA
Symbo l
Descri ption
Minid ip
SO 8
Unit
Rth j-amb
Thermal Resistance Junction-ambient.
max.
100
150
°C/W
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
3/15


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