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PDF UC3843B Data sheet ( Hoja de datos )
| Número de pieza | UC3843B | |
| Descripción | HIGH PERFORMANCE CURRENT MODE CONTROLLERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC3843B (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
DESCRIPTION
The UTC UC3842B/3843B are specifically designed for
off-line and dc-to-dc converter applications offering the designer
a cost-effective solution with minimal external components.
The UC3842B has UVLO thresholds 16V (on) and 10V(off),
ideally suited for off-line converters. The UC3843B is tailored for
lower voltage applications having UVLO thresholds of 8.4V(on)
and 7.6V(off).
FEATURES
* Trimmed oscillator for precise frequency control
* Oscillator frequency guaranteed at 250kHz
* Current mode operation to 500kHz
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* Internally trimmed reference with undervoltage lockout
* High current totem pole output
* Undervoltage lockout with hysteresis
* Low startup and operating current
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3842BL-D08-T
UC3842BP-D08-T
- UC3842BP-S08-R
UC3843BL-D08-T
UC3843BP-D08-T
- UC3843BP-S08-R
Package
DIP-8
SOP-8
DIP-8
SOP-8
Packing
Tube
Tape Reel
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
ERROR AMPLIFIER SECTION
Voltage Feedback Input
Input Bias Current
Open Loop Voltage Gain
Unity Gain Bandwidth
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
Output Voltage Swing High State
Output Voltage Swing Low State
CURRENT SENSE SECTION
Current Sense Input Voltage Gain
Maximum Current Sense Input
Threshold
VFB
II(BIAS)
GVO
GBW
PSRR
ISINK
ISOURCE
VOH
VOL
GV
VI(THR)
Vo=2.5V
VFB=5.0V
2 ≤VO≤4V
TJ =25°C
I2V≤VCC≤25V
VO=1.1V,VFB =2.7V
VO=5.0V,VFB=2.3V
VFB=2.3V, RL=15k to GND
VFB=2.7V, RL=15k to VREF
(Note 2, 3)
(Note 2)
Power Supply Rejection Ratio
Input Bias Current
Propagation Delay
OUTPUT SECTION
Output Low Voltage
Output High Voltage
Output Voltage with UVLO
Activated
PSRR
II(BIAS)
tD(IN/OUT)
12≤Vcc≤25V (Note 2)
Current Sense Input to Output
VOL
VOH
ISINK=20mA
ISINK=200mA
ISOURCE=20mA
ISOURCE=200mA
VOL (UVLO) VCC=6.0V,ISINK=1.0mA
Output Voltage Rise Time
Output Voltage Fall Time
tR TJ =25°C, CL=1nF
tF TJ =25°C, CL=1nF
UNDER-VOLTAGE LOCKOUT SECTION
Startup Threshold
VTHR
Min. Operating Voltage After
Turn-on(VCC)
VCC(MIN)
UC3842B
UC3843B
UC3842B
UC3843B
PWM SECTION
Duty Cycle
MAX
MIN
DC
Total DEVICE
Power Startup Supply Current
ICC+IC
VCC=6.5V for UC3843B
VCC=14V for UC3842B
Power Operating Supply Current
ICC+IC Note 1
Power Supply Zener Voltage
VZ ICC=25mA
Note: 1. Adject VCC above the Startup threshold before setting to 15V.
2. This parameter is measured at the latch trip point with VFB=0V.
3. Comparator gain is defined as : GV
V Output Compensation
V Current Sense Input
MIN TYP MAX UNIT
2.42 2.50 2.58 V
-0.1 -2.0 μA
65 90
dB
0.7 1.0
MHz
60 70
dB
2.0 12
mA
-0.5 -1.0
mA
5.0 6.2
V
0.8 1.1
V
2.85 3.0 3.15 V/V
0.9 1.0 1.1
V
70
-2 -10
150 300
dB
μA
ns
0.1 0.4
1.6 2.2
13 13.5
12 13.4
0.1 1.1
50 150
50 150
V
V
V
V
V
ns
ns
14.5 16 17.5
7.8 8.4
9
8.5 10 11.5
7.0 7.6 8.2
V
V
V
V
94 96
%
0%
0.3 0.5 mA
12 17 mA
30 36
V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UC3842B/3843B
TYPICAL CHARACTERISTICS(Cont.)
LINEAR INTEGRATED CIRCUIT
Fig. 13 Output Saturation Voltage Versus Load Current
0
-10
Source Saturation
VCC
(Load to Ground)
TA=25°C
VCC=15V
80µs Pulsed Load
120Hz Rate
-20
TA=-55°C
30
TA=-
20 55°C
TA=25°
C
10 Sink Saturation GND
0 (Load to VCC)
0 200 400 600 800
Output Load Current, IOUT (mA)
90
%
10
%
Fig. 14 Output Waveform
VCC=15V
CL=1.0nF
TA=25°C
50ns/DIV
Fig. 15 Output Cross Conduction
VCC=30V
CL=15pF
TA=25°C
Fig. 16 Supply Current vs. Supply Voltage
25
20
15
10
RT=10k
CT=3.3nF
5 VFB=0V
ISENSE=0V
TA=25°C
0 0 10 20 30 40
Supply Voltage, VCC (V)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
11 of 11
QW-R103-012.F
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet UC3843B.PDF ] | |
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