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UC3843BVDR2 Datasheet

  • UC3843BVDR2

  • Current-Mode SMPS Controller

  • 20頁(yè)

  • ETC

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UC3842B, UC3843B,
UC2842B, UC2843B,
NCV3843BV
High Performance
Current Mode Controllers
The UC3842B, UC3843B series are high performance fixed
frequency current mode controllers. They are specifically designed for
Off鈥揕ine and dc鈥搕o鈥揹c converter applications offering the designer a
cost鈥揺ffective 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.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle鈥揵y鈥揷ycle
current limiting, programmable output deadtime, and a latch for single
pulse metering.
These devices are available in an 8鈥損in dual鈥搃n鈥搇ine and surface
mount (SO鈥?) plastic package as well as the 14鈥損in plastic surface
mount (SO鈥?4). The SO鈥?4 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 off鈥搇ine converters. The UCX843B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
鈥?/div>
Trimmed Oscillator for Precise Frequency Control
鈥?/div>
Oscillator Frequency Guaranteed at 250 kHz
鈥?/div>
Current Mode Operation to 500 kHz
鈥?/div>
Automatic Feed Forward Compensation
鈥?/div>
Latching PWM for Cycle鈥揃y鈥揅ycle Current Limiting
鈥?/div>
Internally Trimmed Reference with Undervoltage Lockout
鈥?/div>
High Current Totem Pole Output
鈥?/div>
Undervoltage Lockout with Hysteresis
鈥?/div>
Low Startup and Operating Current
V
CC
V
ref
8(14)
R
R
R
T
/C
T
4(7)
Voltage
Feedback
Input
+
-
http://onsemi.com
8
1
PDIP鈥?
N SUFFIX
CASE 626
8
1
SO鈥?
D1 SUFFIX
CASE 751
14
1
SO鈥?4
D SUFFIX
CASE 751A
PIN CONNECTIONS
Compensation
Voltage Feedback
Current Sense
R
T
/C
T
1
2
3
4
8
7
6
5
V
ref
V
CC
Output
Gnd
(Top View)
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
R
T
/C
T
1
2
3
4
5
6
7
14
13
12
11
10
9
8
7(12)
5.0V
Reference
V
ref
Undervoltage
Lockout
Oscillator
Latching
PWM
V
CC
Undervoltage
Lockout
V
C
7(11)
Output
6(10)
Power
Ground
5(8)
Current
Sense
3(5) Input
V
ref
NC
V
CC
V
C
Output
Gnd
Power Ground
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 17 of this data sheet.
2(3)
Output
Compensation
1(1)
Error
Amplifier
Gnd 5(9)
Pin numbers in parenthesis are for the D suffix SO-14 package.
Figure 1. Simplified Block Diagram
漏
Semiconductor Components Industries, LLC, 2001
1
December, 2001 鈥?Rev. 3
Publication Order Number:
UC3842B/D

UC3843BVDR2 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 275kHz

  • 96%

  • 7.6 V ~ 30 V

  • 無(wú)

  • 是

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 是

  • -40°C ~ 105°C

  • 14-SOIC（0.154"，3.90mm 寬）

  • 帶卷 (TR)

  • UC3843BVDR2OSTR

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