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Datasheet> All Categories > Power/power management> The power supply circuit> CS2844LDR14
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CS2844LDR14

Description
1 A SWITCHING CONTROLLER, PDSO16
CategoryPower/power management    The power supply circuit   
File Size148KB，6 Pages
ManufacturerCHERRY
Websitehttp://www.cherry-semi.com
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CS2844LDR14 Overview

1 A SWITCHING CONTROLLER, PDSO16

CS2844LDR14 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerCHERRY
package instructionSO-14
Reach Compliance Codeunknow
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage12 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G14
JESD-609 codee0
Number of functions1
Number of terminals14
Maximum operating temperature85 °C
Minimum operating temperature-25 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
surface mountYES
Switch configurationBUCK
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelOTHER
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL

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CS2844/3845 SERIES
CS2844/CS3844
CS2845/CS3845
Current Mode PWM Control Circuit
with 50% Max Duty Cycle
Description
The CS3844/45 provides all the neces-
sary features to implement off-line
fixed frequency current-mode control
with a minimum number of external
components.
The CS3844 family incorporates a new
precision temperature-controlled oscil-
lator to minimize variations in fre-
quency. An internal toggle flip-flop,
which blanks the output every other
clock cycle, limits the duty-cycle range
to less than 50%. An undervoltage
lockout ensures that V
REF
is stabilized
before the output stage is enabled. In
the CS2844/CS3844 turn on occurs at
16V and turn off at 10V. In the
CS2845/CS3845 turn on is at 8.4V and
turn off at 7.6V.
Other features include low start-up
current, pulse-by-pulse current limit-
ing, and a high-current totem pole out-
put for driving capacitive loads, such
as gate of a power MOSFET. The out-
put is low in the off state, consistent
with N-channel devices.
Features
s
Optimized for Offline
Control
s
Temp. Compensated
Oscillator
s
50% Max Duty-cycle Clamp
s
V
REF
Stabilized before
Output Stage is Enabled
s
Low Start-up Current
s
Pulse-by-pulse Current
Limiting
s
Improved Undervoltage
Lockout
s
Double Pulse Suppression
s
1% Trimmed Bandgap Ref.
s
High Current Totem Pole
Output
Absolute Maximum Ratings
Supply Voltage (I
CC
<30mA).........................................................................Self Limiting
Supply Voltage (Low Impedance Source) .................................................................30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load) ................................................................................5µJ
Analog Inputs (V
FB
, V
SENSE
) .........................................................................-0.3V to 5.5V
Error Amp Output Sink Current .............................................................................10mA
Package Options
8 Lead PDIP & SO Narrow
COMP
V
FB
Sense
OSC
1
2
3
4
8
7
6
5
Lead Temperature Soldering
Wave Solder (through hole styles only) ...................10 sec. max, 260°C peak
Reflow (SMD styles only) ....................60 sec. max above 183°C, 230°C peak
Block Diagram
V
REF
V
CC
V
OUT
Gnd
14 Lead SO Narrow
V
CC
V
CC
Undervoltage Lock-out
COMP
1
14
13
12
11
10
9
8
V
REF
NC
V
CC
V
CC
Pwr
V
OUT
Gnd
Pwr Gnd
V
CC
Pwr
NC
2
V
FB
3
34V
Gnd
16V/10V
(8.4V/7.6V)
V
FB
Error
Amplifier
-
+
OSC
2.50V
Set/
5.0 Volt
Reset Reference
Internal
Bias
R
V
REF
Undervoltage
Lockout
Toggle
Flip-Flop
V
REF
NC
4
Sense
5
NC
6
OSC
7
COMP
16 Lead SO Wide
NC
1
NC
2
16
15
14
13
12
11
10
9
NC
V
REF
V
CC
V
CCPwr
V
O
Gnd
Pwr Gnd
NC
R
NOR
V
OUT
COMP
3
V
FB
4
Oscillator
2 R
R
Sense
1V
S
Pwr Gnd
R
Current PWM
Sensing Latch
Comparator
SENSE
5
OSC
6
NC
7
NC
8
( ) indicates CS-2845/3845
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 3/17/99
1
A
®
Company

CS2844LDR14 Related Products

CS2844LDR14 CS2844LDWR16 CS2844LN8 CS2844 CS2845LDW16 CS2845LDWR16 CS3844GDW16 CS3844GDR8 CS3844GDWR16 CS3845GD14
Description 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16 1 A SWITCHING CONTROLLER, PDSO16
Is it Rohs certified? incompatible incompatible incompatible - incompatible incompatible incompatible incompatible incompatible incompatible
Maker CHERRY CHERRY CHERRY - CHERRY CHERRY CHERRY CHERRY CHERRY CHERRY
package instruction SO-14 SO-16 PLASTIC, DIP-8 - SO-16 SO-16 SO-16 SO-8 SO-16 SO-14
Reach Compliance Code unknow unknow unknow - unknow unknow unknow unknow unknow unknow
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE - CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 25 V 25 V 25 V - 25 V 25 V 25 V 25 V 25 V 25 V
Minimum input voltage 12 V 12 V 12 V - 12 V 12 V 12 V 12 V 12 V 12 V
Nominal input voltage 15 V 15 V 15 V - 15 V 15 V 15 V 15 V 15 V 15 V
JESD-30 code R-PDSO-G14 R-PDSO-G16 R-PDIP-T8 - R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G8 R-PDSO-G16 R-PDSO-G14
JESD-609 code e0 e0 e0 - e0 e0 e0 e0 e0 e0
Number of functions 1 1 1 - 1 1 1 1 1 1
Number of terminals 14 16 8 - 16 16 16 8 16 14
Maximum operating temperature 85 °C 85 °C 85 °C - 85 °C 85 °C 70 °C 70 °C 70 °C 70 °C
Maximum output current 1 A 1 A 1 A - 1 A 1 A 1 A 1 A 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP DIP - SOP SOP SOP SOP SOP SOP
Encapsulate equivalent code SOP14,.25 SOP16,.4 DIP8,.3 - SOP16,.4 SOP16,.4 SOP16,.4 SOP8,.25 SOP16,.4 SOP14,.25
Package shape RECTANGULAR RECTANGULAR RECTANGULAR - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE IN-LINE - SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Certification status Not Qualified Not Qualified Not Qualified - Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
surface mount YES YES NO - YES YES YES YES YES YES
Switch configuration BUCK BUCK BUCK - BUCK BUCK BUCK BUCK BUCK BUCK
Maximum switching frequency 500 kHz 500 kHz 500 kHz - 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz
technology BIPOLAR BIPOLAR BIPOLAR - BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR
Temperature level OTHER OTHER OTHER - OTHER OTHER COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING GULL WING THROUGH-HOLE - GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm 2.54 mm - 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm
Terminal location DUAL DUAL DUAL - DUAL DUAL DUAL DUAL DUAL DUAL

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