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UC284XBDG Fiches technique(PDF) 2 Page - ON Semiconductor

No de pièce UC284XBDG
Description  High Performance Current Mode Controllers
Download  19 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC284XBDG Fiches technique(HTML) 2 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
2
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1)
VCC, VC
36
V
Total Power Supply and Zener Current
(ICC + IZ)
30
mA
Output Current, Source or Sink (Note 2)
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
UC3844BV, UC3845BV
TA
0 to +70
−25 to +85
−40 to +105
°C
Storage Temperature Range
Tstg
− 65 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The voltage is clamped by a zener diode (see page 9 Under Voltage Lockout section). Therefore this voltage may be exceeded as long as
the total power supply and zener current is not exceeded.
2. Maximum package power dissipation limits must be observed.
3. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JEDEC Standard
JESD22-A114B, Machine Model Method 200 V per JEDEC Standard JESD22-A115-A
4. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 5], 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 6], unless otherwise noted.)
UC284xB
UC384xB, xBV, NCV384xBV
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, & 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 w/ Temperature (TA = Tlow to Thigh) DfOSC/DT
1.0
0.5
%
Oscillator Voltage Swing (Peak−to−Peak)
VOSC
1.6
1.6
V
5. Adjust VCC above the Startup threshold before setting to 15 V.
6. 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 UC384xBV, NCV384xBV
=+105°C for UC3844BV, UC3845BV
= +125°C for NCV384xBV


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