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UC3844D Datasheet

  • UC3844D

  • HIGH PERFORMANCE CURRENT MODE CONTROLLERS

  • 14頁

  • ONSEMI

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Order this document by UC3844/D
UC3844, 45
UC2844, 45
High Performance
Current Mode Controllers
The UC3844, UC3845 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 effective
solution with minimal external components. These integrated circuits feature
an oscillator, 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,
a latch for single pulse metering, and a flip鈥揻lop which blanks the output off
every other oscillator cycle, allowing output deadtimes to be programmed for
50% to 70%.
These devices are available in an 8鈥損in dual鈥搃n鈥搇ine 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 UCX844 has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off鈥搇ine converters. The UCX845 is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
鈥?/div>
Current Mode Operation to 500 kHz Output Switching Frequency
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO鈥?4)
14
1
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
(Top View)
8
7
6
5
Vref
VCC
Output
Gnd
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle鈥揃y鈥揅ycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Input Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Direct Interface with Motorola SENSEFET Products
Compensation
NC
Voltage Feedback
NC
Current Sense
1
2
3
4
5
6
7
(Top View)
14 Vref
13 NC
12 VCC
11 VC
10 Output
9
8
Gnd
Power Ground
Simplified Block Diagram
VCC
Vref
8(14)
R
R
RTCT
4(7)
Voltage
Feedback
2(3)
1(1)
Output
Comp.
Vref
Undervoltage
Lockout
Oscillator
Flip
Flop
&
Latching
PWM
5.0V
Reference
7(12)
NC
RT/CT
VCC
Undervoltage
Lockout
VC
7(11)
Output
6(10)
PWR GND
5(8)
Current
Sense
3(5)
ORDERING INFORMATION
Device
UC3844D
UC3845D
UC3844N
UC3845N
UC2844D
UC2845D
TA = 鈥?25擄 to +85擄C
TA = 0擄 to +70擄C
Operating
Temperature Range
Package
SO鈥?4
SO鈥?4
Plastic
Plastic
SO鈥?4
SO鈥?4
Plastic
Plastic
Rev 1
+
鈥?/div>
Error
Amplifier
Gnd
5(9)
UC2844N
UC2845N
Pin numbers in parenthesis are for the D suffix SO鈥?4 package.
漏
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1

UC3844D 產(chǎn)品屬性

  • 4,860

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 500kHz

  • 50%

  • 10 V ~ 30 V

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 14-SOIC（0.154"，3.90mm 寬）

  • 管件

  • UC3844DFS

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