Datasheet Texas Instruments UC3856Q

Manufacturer	Texas Instruments
Series	UC3856
Part Number	UC3856Q

Improved Current Mode PWM Controller 20-PLCC 0 to 70

Datasheets

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PDF, 3.3 Mb, Revision: A, File published: Oct 7, 2010

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PACKAGE OPTION ADDENDUM www.ti.com 5-Dec-2011 PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) (Requires Login) 5962-9453001M2A ACTIVE LCCC FK 20 1 TBD Call TI Call TI 5962-9453001MEA ACTIVE CDIP J 16 1 TBD Call TI Call TI UC1856J ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type UC1856J883B ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type UC1856L OBSOLETE TO/SOT L 28 TBD Call TI Call TI UC1856L20 ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type UC1856L20883B ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type UC1856L883B OBSOLETE TO/SOT L 28 UC2856DW ACTIVE SOIC DW 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2856DWG4 ACTIVE SOIC DW 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2856DWTR ACTIVE SOIC DW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2856DWTRG4 ACTIVE SOIC DW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2856J ACTIVE CDIP J 16 1 TBD UC2856N ACTIVE PDIP N 16 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type UC2856NG4 ACTIVE PDIP N 16 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type UC3856DW ACTIVE SOIC DW 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3856DWG4 ACTIVE SOIC DW 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3856DWTR ACTIVE SOIC DW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3856DWTRG4 ACTIVE SOIC DW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3856N ACTIVE PDIP N 16 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type UC3856NG4 ACTIVE PDIP N 16 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type TBD Addendum-Page 1 Call TI A42 Samples Call TI N / A for Pkg Type PACKAGE OPTION ADDENDUM www.ti.com 5-Dec-2011 Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login) UC3856Q ACTIVE PLCC FN 20 46 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR UC3856QG3 ACTIVE PLCC FN 20 46 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR (1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. …

Prices

Status

Lifecycle Status	NRND (Not recommended for new designs)
Manufacture's Sample Availability	No

Packaging

Pin	20
Package Type	FN
Industry STD Term	PLCC
JEDEC Code	S-PQCC-J
Package QTY	46
Carrier	TUBE
Device Marking	UC3856Q
Width (mm)	8.96
Length (mm)	8.96
Thickness (mm)	4.06
Pitch (mm)	1.27
Max Height (mm)	4.57
Mechanical Data	Download

Parametrics

Control Method	Current
Duty Cycle(Max)	50 %
Frequency(Max)	1000 kHz
Gate Drive(Typ)	1.5 A
Operating Temperature Range	0 to 70 C
Package Group	PDIP,SOIC
Rating	Catalog
Special Features	Error Amplifier,Multi-topology,Soft Start,Synchronization Pin
Topology	Boost,Buck,Flyback,Forward,Full-Bridge,Half-Bridge,Push-Pull
UVLO Thresholds On/Off	7.7/7 V
Vin(Max)	40 V
Vin(Min)	8 V

Eco Plan

RoHS

Compliant

Application Notes

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DN-45 UC3846 UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs
PDF, 27 Kb, File published: Sep 5, 1999
The UC3856 is a pin-for-pin-compatible high-performance bipolar version of the industry standard UC3846. It can replace the UC3846 with few circuit modifications and it features increased speed higher gate-drive current and reduced propagation delays. The UCC3806 is a BiCMOS pin-for-pin compatible ultra-low-power version ideal for battery low-power and high-speed applications. The UCC3806
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DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode
PDF, 66 Kb, File published: Sep 5, 1999
This design note explains the differences between voltage-mode and current-mode switching power supply topologies. It includes a circuit diagram for each mode and suggests criteria for choosing which mode to use.

Model Line

Series: UC3856 (8)

UC3856DW UC3856DWG4 UC3856DWTR UC3856DWTRG4 UC3856N UC3856NG4 UC3856Q UC3856QG3

Manufacturer's Classification

Semiconductors > Power Management > Offline and Isolated DC/DC Controllers and Converters > PWM and Resonant Controller