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UC3842B Datasheet PDF - American First Semiconductor


UC3842B/3B/4B/5B - High Performance Current Mode Controllers

Numéro de référence UC3842B
Description UC3842B/3B/4B/5B - High Performance Current Mode Controllers
Fabricant American First Semiconductor 
Logo American First Semiconductor Logo 
avant-première
1 Page
		
UC3842B Datasheet
UC3842B Fiche technique
UC3842B/3B/4B/5B,UC2842B/3B
Electrical Characteristics(VCC = 15 V [Note 4], 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 5], unless otherwise noted.)
UC284XB
UC384XB
Characteristics
Symbol Min Typ Max Min Typ Max
Error Amplifier Section
Voltage Feedback Input (VO = 2.5 V)
Input Bias Current (VFB = 5.0 V)
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
Unity Gain Bandwidth (TJ = 25°C)
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
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)
VFB
IIB
AVOL
BW
PSRR
2.45 2.5 2.55 2.42 2.5 2.58
– – 0.1 –1.0 – – 0.1 – 2.0
65 90 – 65 90 –
0.7 1.0 – 0.7 1.0 –
60 70 – 60 70 –
ISink 2.0 12 – 2.0 12 –
ISource
– 0.5 –1.0
– 0.5 –1.0
VOH 5.0 6.2 – 5.0 6.2 –
VOL
– 0.8 1.1 – 0.8 1.1
Current Sense Section
Current Sense Input Voltage Gain (Notes 6 & 7)
(UC284XB, UC384XB)
Maximum Current Sense Input Threshold (Note 6)
(UC284XB, UC384XB)
Power Supply Rejection Ratio (VCC = 12 V to 25 V, Note 6)
Input Bias Current
Propagation Delay (Current Sense Input to Output)
Output Section
Output Voltage
Low State (ISink = 20 mA)
(ISink = 200 mA) (UC284XB, UC384XB)
High State (ISource = 20 mA) (UC284XB, UC384XB)
(ISource = 200 mA)
Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA)
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
Undervoltage Lockout Section
Startup Threshold (VCC)
UCX842B/4B
UCX843B/5B
AV
Vth
PSRR
IIB
tPLH(In/Out)
VOL
VOH
VOL(UVLO)
tr
tf
Vth
2.85
0.9
13
12
15
7.8
3.0
1.0
70
– 2.0
150
0.08
1.4
13.5
13.0
0.1
45
35
16
8.4
3.15
1.1
–10
300
0.4
2.2
1.1
150
150
17
9.0
2.85
0.9
13
12
14.5
7.8
3.0
1.0
70
– 2.0
150
0.08
1.4
13.5
13.0
0.1
45
35
16
8.4
3.15
1.1
–10
300
0.4
2.2
1.1
150
150
17.5
9.0
Minimum Operating Voltage After Turn–On (VCC)
UCX842B/4B
UCX843B/5B
VCC(min)
9.0 10 11 8.5 10
7.0 7.6 8.2 7.0 7.6
4. Adjust VCC above the Startup threshold before setting to 15 V.
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for UC3842B/3B/4B/5B; –25°C for UC2842B/3B
Thigh = +70°C for UC3842B/3B/4B/5B; +85°C for UC2842B/3B
6. This parameter is measured at the latch trip point with VFB = 0 V.
7. Comparator gain is defined as: AV
V Output Compensation
V Current Sense Input
11.5
8.2
Unit
V
µA
dB
MHz
dB
mA
V
V/V
V
dB
µA
ns
V
V
ns
ns
V
V
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Page 3/16
UC3842B pdf
UC3842B/3B/4B/5B,UC2842B/3B
VCC = 15 V
IO = 1.0 mA to 20 mA
TA = 25°C
VCC = 12 V to 25
TA = 25°C
2.0 ms/DIV
Figure 12. Reference Load Regulation
0
ÄÄÄ ÄÄÄÄÄÄÄÄÄVCC
Source Saturation
VCC = 15 V
(Load to Ground) 80 µs Pulsed Load
ÄÄÄÄÄÄÄÄÄÄÄÄÄ-1.0 TA=25°C
120 Hz Rate
ÄÄÄÄÄ-Ă2.0
ÄÄÄÄTA = -Ă55°C
3.0
ÄÄÄTA = -Ă55°C
ÄÄÄ ÄÄÄ2.0
TA = 25°C
ÄÄÄÄ ÄÄ1.0 Sink Saturation
(Load to VCC)
Gnd
ÄÄÄÄ ÄÄ0
0 200 400 600 800
IO, OUTPUT LOAD CURRENT (mA)
Figure 14. Output Saturation Voltage
versus Load Current
VCC = 30 V
CL = 15 pF
TA = 25°C
100 ns/DIV
Figure 16. Output Cross Conduction
2.0 ms/DIV
Figure 13. Reference Line Regulation
90%
VCC = 15 V
CL = 1.0 nF
TA = 25°C
10%
50 ns/DIV
Figure 15. Output Waveform
25
20
15
10
RT = 10 k
ÄÄÄÄCT = 3.3 nF
5 VFB = 0 V
ÄÄÄÄISense = 0 V
ÄÄÄÄTA = 25°C
0
0 10 20 30 40
VCC, SUPPLY VOLTAGE (V)
Figure 17. Supply Current versus Supply Voltage
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