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UC2845BD1R2G Datasheet

  • UC2845BD1R2G

  • HIGH PERFORMANCE CURRENT MODE CONTROLLERS

  • 20頁

  • ONSEMI

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UC3844B, UC3845B,
UC2844B, UC2845B
High Performance
Current Mode Controllers
The UC3844B, UC3845B series are high performance fixed
frequency current mode controllers. They are specifically designed for
Off鈭扡ine and dc鈭抎c converter applications offering the designer a
cost鈭抏ffective 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鈭抌y鈭抍ycle
current limiting, a latch for single pulse metering, and a flip鈭抐lop
which blanks the output off every other oscillator cycle, allowing
output deadtimes to be programmed from 50% to 70%.
These devices are available in an 8鈭抪in dual鈭抜n鈭抣ine and surface
mount (SOIC鈭?) plastic package as well as the 14鈭抪in plastic surface
mount (SOIC鈭?4). The SOIC鈭?4 package has separate power and
ground pins for the totem pole output stage.
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off鈭抣ine converters. The UCX845B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
http://onsemi.com
8
1
PDIP鈭?
N SUFFIX
CASE 626
8
1
SOIC鈭?
D1 SUFFIX
CASE 751
14
1
SOIC鈭?4
D SUFFIX
CASE 751A
PIN CONNECTIONS
Compensation
Voltage Feedback
Current Sense
R
T
/C
T
1
2
3
4
8
7
6
5
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Pb鈭扚ree Packages are Available
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
Current Mode Operation to 500 kHz Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle鈭払y鈭扖ycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
(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
V
ref
V
CC
Output
GN
D
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 2 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
漏
Semiconductor Components Industries, LLC, 2004
1
September, 2004 鈭?Rev. 3
Publication Order Number:
UC3844B/D

UC2845BD1R2G 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

  • 50%

  • 7.6 V ~ 30 V

  • 無

  • 是

  • 是

  • 是

  • 無

  • 無

  • 無

  • 是

  • -25°C ~ 85°C

  • 8-SOIC（0.154"，3.90mm 寬）

  • 帶卷 (TR)

  • UC2845BD1R2G-NDUC2845BD1R2GOSTR

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