UC3845BD Просмотр технического описания (PDF) - Motorola => Freescale
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UC3845BD Datasheet PDF : 16 Pages
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UC3844B, 45B UC2844B, 45B
MAXIMUM RATINGS
Rating
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
Output Energy (Capacitive Load per Cycle)
Current Sense and Voltage Feedback Inputs
Error Amp Output Sink Current
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, SO–14 Case 751A
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air
D1 Suffix, Plastic Package, SO–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
Storage Temperature Range
Symbol
(ICC + IZ)
IO
W
Vin
IO
Value
Unit
30
mA
1.0
A
5.0
µJ
– 0.3 to + 5.5 V
10
mA
PD
RθJA
PD
RθJA
PD
RθJA
TJ
TA
Tstg
862
mW
145
°C/W
702
mW
178
°C/W
1.25
100
+150
0 to + 70
– 25 to + 85
– 65 to +150
W
°C/W
°C
°C
°C
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
Line Regulation (VCC = 12 V to 25 V)
Regline
–
2.0
20
–
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
–
3.0
25
–
Temperature Stability
TS
–
0.2
–
–
Total Output Variation over Line, Load, and Temperature
Vref
4.9
–
5.1 4.82
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)
Vn
–
50
–
–
Long Term Stability (TA = 125°C for 1000 Hours)
S
–
5.0
–
–
Output Short Circuit Current
ISC
– 30 – 85 –180 – 30
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)
fOSC
49
52
55
49
48
–
56
48
225 250 275 225
Frequency Change with Voltage (VCC = 12 V to 25 V)
∆fOSC/∆V
–
0.2 1.0
–
Frequency Change with Temperature
TA = Tlow to Thigh
∆fOSC/∆T
–
1.0
–
–
Oscillator Voltage Swing (Peak–to–Peak)
VOSC
–
1.6
–
–
Discharge Current (VOSC = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh (UC284XB, UC384XB)
TA = Tlow to Thigh (UC384XBV)
Idischg
7.8 8.3 8.8 7.8
7.5
–
8.8 7.6
–
–
–
7.2
NOTES: 1. Maximum package power dissipation limits must be observed.
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
5.0
2.0
3.0
0.2
–
50
5.0
– 85
52
–
250
0.2
0.5
1.6
8.3
–
–
5.1
20
25
–
5.18
–
–
–180
V
mV
mV
mV/°C
V
µV
mV
mA
kHz
55
56
275
1.0
%
–
%
–
V
mA
8.8
8.8
8.8
2
MOTOROLA ANALOG IC DEVICE DATA
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