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UC3844B Datasheet(PDF) 3 Page - ON Semiconductor

Part No. UC3844B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3844B Datasheet(HTML) 3 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
3
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
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
mJ
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
D Suffix, Plastic Package, SOIC−14 Case 751A
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction−to−Air
D1 Suffix, Plastic Package, SOIC−8 Case 751
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction−to−Air
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction−to−Air
PD
RqJA
PD
RqJA
PD
RqJA
862
145
702
178
1.25
100
mW
°C/W
mW
°C/W
W
°C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature
UC3844B, UC3845B
UC2844B, UC2845B
TA
0 to + 70
− 25 to + 85
°C
Storage Temperature Range
Tstg
− 65 to +150
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Maximum package power dissipation limits must be observed.
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 2], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values
TA is the operating ambient temperature range that applies [Note 3], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Vref
4.95
5.0
5.05
4.9
5.0
5.1
V
Line Regulation (VCC = 12 V to 25 V)
Regline
2.0
20
2.0
20
mV
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
3.0
25
3.0
25
mV
Temperature Stability
TS
0.2
0.2
mV/
°C
Total Output Variation over Line, Load, and Temperature
Vref
4.9
5.1
4.82
5.18
V
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)
Vn
50
50
mV
Long Term Stability (TA = 125°C for 1000 Hours)
S
5.0
5.0
mV
Output Short Circuit Current
ISC
−30
−85
−180
−30
−85
−180
mA
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)
fOSC
49
48
225
52
250
55
56
275
49
48
225
52
250
55
56
275
kHz
Frequency Change with Voltage (VCC = 12 V to 25 V)
DfOSC/DV
0.2
1.0
0.2
1.0
%
Frequency Change with Temperature (TA = Tlow to Thigh)
DfOSC/DT
1.0
0.5
%
Oscillator Voltage Swing (Peak−to−Peak)
VOSC
1.6
1.6
V
Discharge Current (VOSC = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh (UC284XB, UC384XB)
TA = Tlow to Thigh (UC384XBV)
Idischg
7.8
7.5
8.3
8.8
8.8
7.8
7.6
7.2
8.3
8.8
8.8
8.8
mA
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 UC3844B, UC3845B
Thigh =+ 70°C for UC3844B, UC3845B
=− 25
°C for UC2844B, UC2845B
= + 85
°C for UC2844B, UC2845B
=− 40
°C for UC3844BV, UC3845BV
= +105
°C for UC3844BV, UC3845BV


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