Image UC3842BNG
型号: UC3842BNG
厂商: ON Semiconductor ON Semiconductor
标准:
分类: 半导体集成电路 - IC
描述: switching controllers 52khz 1A current pwm w/96% duty cycle max
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UC3842BNG的详细信息

Manufacturer: ON Semiconductor
Product Category: Switching Controllers
RoHS: Yes
Brand: ON Semiconductor
Topology: Boost, Flyback, Forward
Number of Outputs: 1
Switching Frequency: 500 kHz
Duty Cycle - Max: 96 %
Output Voltage: 4.9 V to 5.1 V
Output Current: 1000 mA
Maximum Operating Temperature: + 70 C
Mounting Style: Through Hole
Package / Case: PDIP-8
Packaging: Tube
Fall Time: 50 ns
Minimum Operating Temperature: 0 C
Operating Supply Voltage: 30 V
Rise Time: 50 ns
Series: UC3842B
Factory Pack Quantity: 50
UC3842B, UC3843B,  
UC2842B, UC2843B  
High Performance  
Current Mode Controllers  
The UC3842B, UC3843B series are high performance fixed  
frequency current mode controllers. They are specifically designed for  
OffLine and DCDC converter applications offering the designer a  
costeffective solution with minimal external components. These  
integrated circuits feature a trimmed oscillator for precise duty cycle  
control, a temperature compensated reference, high gain error  
amplifier, current sensing comparator, and a high current totem pole  
output ideally suited for driving a power MOSFET.  
PDIP8  
N SUFFIX  
CASE 626  
8
Also included are protective features consisting of input and  
reference undervoltage lockouts each with hysteresis, cyclebycycle  
current limiting, programmable output deadtime, and a latch for single  
pulse metering.  
These devices are available in an 8pin dualinline and surface  
mount (SOIC8) plastic package as well as the 14pin plastic surface  
mount (SOIC14). The SOIC14 package has separate power and  
ground pins for the totem pole output stage.  
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),  
ideally suited for offline converters. The UCX843B is tailored for  
lower voltage applications having UVLO thresholds of 8.5 V (on) and  
7.6 V (off).  
1
SOIC14  
D SUFFIX  
CASE 751A  
14  
1
SOIC8  
D1 SUFFIX  
CASE 751  
8
1
Features  
Trimmed Oscillator for Precise Frequency Control  
Oscillator Frequency Guaranteed at 250 kHz  
Current Mode Operation to 500 kHz  
Automatic Feed Forward Compensation  
Latching PWM for CycleByCycle Current Limiting  
Internally Trimmed Reference with Undervoltage Lockout  
High Current Totem Pole Output  
PIN CONNECTIONS  
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
V
V
ref  
CC  
Output  
GND  
R /C  
T
T
(Top View)  
Compensation  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
Undervoltage Lockout with Hysteresis  
Low Startup and Operating Current  
ref  
NC  
Voltage Feedback  
NC  
NC  
V
V
CC  
This is a PbFree and HalideFree Device  
C
V
CC  
7(12)  
Current Sense  
NC  
Output  
V
V
GND  
CC  
ref  
5.0V  
Reference  
Undervoltage  
Lockout  
8
R /C  
T
Power Ground  
T
8(14)  
R
R
(Top View)  
V
ref  
V
C
Undervoltage  
Lockout  
7(11)  
ORDERING INFORMATION  
R /C  
T
Output  
T
Oscillator  
dimensions section on page 17 of this data sheet.  
6(10)  
4(7)  
Latching  
PWM  
Power  
Ground  
5(8)  
Voltage  
Feedback  
Input  
2(3)  
Output  
Compensation  
+
-
DEVICE MARKING INFORMATION  
Error  
Amplifier  
Current  
Sense  
Input  
3(5)  
1(1)  
GND 5(9)  
Pin numbers in parenthesis are for the D suffix SOIC14 package.  
Figure 1. Simplified Block Diagram  
© Semiconductor Components Industries, LLC, 2013  
1
Publication Order Number:  
September, 2013 Rev. 17  
UC3842B/D  

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