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UC2845B Fiches technique(PDF) 3 Page - ON Semiconductor

No de pièce UC2845B
Description  High Performance Current Mode Controllers
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
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UC2845B Fiches technique(HTML) 3 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
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3
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 7], 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 8], unless otherwise noted.)
UC284xB
UC384xB, xBV,
NCV384xBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
OSCILLATOR SECTION
Discharge Current (VOSC = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh (UC284XB, UC384XB)
(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
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB
2.45
2.5
2.55
2.42
2.5
2.58
V
Input Bias Current (VFB = 5.0 V)
IIB
− 0.1
−1.0
− 0.1
− 2.0
mA
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
AVOL
65
90
65
90
dB
Unity Gain Bandwidth (TJ = 25°C)
BW
0.7
1.0
0.7
1.0
MHz
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
PSRR
60
70
60
70
dB
Output Current − Sink (VO = 1.1 V, VFB = 2.7 V)
Output Current − Source (VO = 5.0 V, VFB = 2.3 V)
ISink
ISource
2.0
− 0.5
12
−1.0
2.0
− 0.5
12
−1.0
mA
Output Voltage Swing
High State (RL = 15 k to ground, VFB = 2.3 V)
Low State (RL = 15 k to Vref, VFB = 2.7 V)
(UC284XB, UC384XB)
(UC384XBV)
VOH
VOL
5.0
6.2
0.8
1.1
5.0
6.2
0.8
0.8
1.1
1.2
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 9 & 10)
(UC284XB, UC384XB)
(UC384XBV)
AV
2.85
3.0
3.15
2.85
2.85
3.0
3.0
3.15
3.25
V/V
Maximum Current Sense Input Threshold (Note 9)
(UC284XB, UC384XB)
(UC384XBV)
Vth
0.9
1.0
1.1
0.9
0.85
1.0
1.0
1.1
1.1
V
Power Supply Rejection Ratio (VCC = 12 V to 25 V) (Note 9)
PSRR
70
70
dB
Input Bias Current
IIB
− 2.0
−10
− 2.0
−10
mA
Propagation Delay (Current Sense Input to Output)
tPLH(In/Out)
150
300
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
(ISink = 200 mA, UC284XB, UC384XB)
(ISink = 200 mA, UC384XBV)
High State (ISource = 20 mA, UC284XB, UC384XB)
(ISource = 20 mA, UC384XBV)
(ISource = 200 mA)
VOL
VOH
13
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12.9
12
0.1
1.6
1.6
13.5
13.4
0.4
2.2
2.3
V
Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA) VOL(UVLO)
0.1
1.1
0.1
1.1
V
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
tr
50
150
50
150
ns
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
tf
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX844B, BV
UCX845B, BV
Vth
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After Turn−On
UCX844B, BV
UCX845B, BV
VCC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
V
7. Adjust VCC above the Startup threshold before setting to 15 V.
8. 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
9. This parameter is measured at the latch trip point with VFB = 0 V.
10.Comparator gain is defined as: AV = DV Output/Compensation
DV Current Sense Input


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