UC2845BAC 查看數據表（PDF） - ON Semiconductor
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UC2845BAC Datasheet PDF : 20 Pages
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UC3844B, UC3845B, UC2844B, UC2845B
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
Output Energy (Capacitive Load per Cycle)
(ICC + IZ)
IO
W
30
mA
1.0
A
5.0
mJ
Current Sense and Voltage Feedback Inputs
Error Amp Output Sink Current
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
Operating Junction Temperature
Operating Ambient Temperature
UC3844B, UC3845B
UC2844B, UC2845B
Vin
IO
PD
RqJA
PD
RqJA
PD
RqJA
TJ
TA
− 0.3 to + 5.5
V
10
mA
862
145
702
178
1.25
100
+150
0 to + 70
− 25 to + 85
mW
°C/W
mW
°C/W
W
°C/W
°C
°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)
Line Regulation (VCC = 12 V to 25 V)
Vref
Regline
4.95 5.0 5.05 4.9
5.0
5.1
−
2.0
20
−
2.0
20
Load Regulation (IO = 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, and 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
Regload
TS
Vref
Vn
S
ISC
−
3.0
25
−
3.0
25
−
0.2
−
−
0.2
−
4.9
−
5.1 4.82
−
5.18
−
50
−
−
50
−
−
5.0
−
−
5.0
−
− 30 − 85 −180 − 30 − 85 −180
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)
Frequency Change with Voltage (VCC = 12 V to 25 V)
Frequency Change with Temperature (TA = Tlow to Thigh)
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (VOSC = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh (UC284XB, UC384XB)
TA = Tlow to Thigh (UC384XBV)
fOSC
DfOSC/DV
DfOSC/DT
VOSC
Idischg
49
52
55
49
52
55
48
−
56
48
−
56
225 250 275 225 250 275
−
0.2 1.0
−
0.2 1.0
−
1.0
−
−
0.5
−
−
1.6
−
−
1.6
−
7.8
8.3
8.8
7.8
8.3
8.8
7.5
−
8.8 7.6
−
8.8
−
−
−
7.2
−
8.8
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
= − 25°C for UC2844B, UC2845B
Thigh = + 70°C for UC3844B, UC3845B
= + 85°C for UC2844B, UC2845B
= − 40°C for UC3844BV, UC3845BV
= +105°C for UC3844BV, UC3845BV
V
mV
mV
mV/°C
V
mV
mV
mA
kHz
%
%
V
mA
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