UCC35705 MODULATOR Datasheet

UCC35705 Datasheet, PDF, Equivalent


Part Number

UCC35705

Description

HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR

Manufacture

etcTI

Total Page 23 Pages
Datasheet
Download UCC35705 Datasheet


UCC35705
UCC25705, UCC25706, UCC35705, UCC35706
HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR
D Greater Than 4-MHz Operation
D Integrated Oscillator / Voltage Feed Forward
Compensation
D >4:1 Input Voltage Range
D 25-ns Current Limit Delay
D Programmable Maximum Duty Cycle Clamp
D Optocoupler Interface
D 50-μA Start-Up Current
D 4.2-mA Operating Current @ 1 MHz
D Smallest Footprint of the 8-pin MSOP
Package Minimizes Board Area and Height
SLUS473B -- NOVEMBER 1999 -- REVISED OCTOBER 2010
D, OR P PACKAGE
(TOP VIEW)
DGK PACKAGE
(TOP VIEW)
ILIM
FB
VFF
DISCH
1
2
3
4
1 ILIM
2 FB
3 VFF
4 DISCH
VDD
OUT
GND
RC
8
7
6
5
8 VDD
7 OUT
6 GND
5 RC
description
The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current
protection. These devices are used as core high-speed building blocks in high performance isolated and non-isolated
power converters.
UCC35705/UCC35706 devices feature a high speed oscillator with integrated feed-forward compensation for
improved converter performance. A typical current sense to output delay time of 25 ns provides fast response to
overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for increased
protection which can also be disabled for the oscillator to run at maximum possible duty cycle.
Two UVLO options are offered. The UCC35705 with lower turn-on voltage is intended for dc-to-dc converters while
the higher turn-on voltage and the wider UVLO range of the UCC35706 is better suited for offline applications.
The UCC35705/UCC35706 family is offered in 8-pin MSOP (DGK), SOIC (D) and PDIP (P) packages.
typical application schematic
++
VIN VO-U- T
--
4 DISCH VDD 8
FB 2
5 RC
3 VFF
OUT 7
6 GND ILIM 1
MODE = 1
UCC35705/6
TPS2829
FET DRIVER
SOFT
START
CIRCUIT
UDG-99181
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001 -- 2010, Texas Instruments Incorporated
1

UCC35705
UCC25705, UCC25706, UCC35705, UCC35706
HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR
SLUS473B -- NOVEMBER 1999 -- REVISED OCTOBER 2010
absolute maximum ratings over operating free-air temperature (unless otherwise noted)}
Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V
Input voltage (VFF,RC,ILIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage (FB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V
Input current (DISCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 mA
Output current (OUT) dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 150°C
Lead temperature (soldering, 10 sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the Power
Supply Control Data Book (TI Literature Number SLUD003) for thermal limitations and considerations of packages.
AVAILABLE OPTIONS
TA = TJ
UVLO Option
Packaged Devices
SOIC-8
Small Outline (D)
PDIP-8
Plastic Dip (P)
MSOP-8
Small Outline
(DGK)
--40°C to 85°C
0°C to 70°C
8.8V/8V
12V/8V
8.8V/8V
12V/8V
UCC25705D
UCC25706D
UCC35705D
UCC35706D
UCC25705P
UCC25706P
UCC35705P
UCC35706P
UCC25705DGK
UCC25706DGK
UCC35705DGK
UCC35706DGK
D (SOIC--8) and DGK (MSOP--8) packages are available taped and reeled. Add R suffix to device type (e.g.
UCC35705DR) to order quantities of 2500 devices per reel for SOIC-8 and 2000 devices per reel for the MSOP-8.
CfeolVerDctDhtre=icU0a.lC1cCμh2Fa5,ra7an0cxdte,nrTiosAtli=ocasTd,JV,o(DnuDnth=lee1so1suVot,pthVueItNrsw,=0is3°e0C
Vsp,TReAcTif=i7e40d7°)Ck,foRrDtIhSCeHU=C4C03057k0, xRFaFnd=
1--440k°,CCT
= 220 pF,
TA 85°C
UVLO section (UCCx5705)
PARAMETER
Start threshold
Stop threshold
Hysteresis
UVLO section (UCCx5706)
PARAMETER
Start threshold
Stop threshold
Hysteresis
supply current section
PARAMETER
Start-up current
IDD active
TEST CONDITIONS
TEST CONDITIONS
TEST CONDITIONS
VDD = UVLO start – 1 V, VDD comparator off
VDD comparator on, oscillator running at 1 MHz
MIN
8.0
7.4
0.3
TYP
8.8
8.2
0.6
MAX
9.6
9.0
1.0
UNITS
V
V
V
MIN
11.2
7.2
3.5
TYP
12.0
8.0
4.0
MAX
12.8
8.8
4.5
UNITS
V
V
V
MIN TYP MAX UNITS
30 90 μA
4.2 5.0 mA
2 www.ti.com


Features UCC25705, UCC25706, UCC35705, UCC35706 H IGH-SPEED VOLTAGE MODE PULSE WIDTH MODU LATOR D Greater Than 4-MHz Operation D Integrated Oscillator / Voltage Feed F orward Compensation D >4:1 Input Voltag e Range D 25-ns Current Limit Delay D P rogrammable Maximum Duty Cycle Clamp D Optocoupler Interface D 50-μA Start-Up Current D 4.2-mA Operating Current @ 1 MHz D Smallest Footprint of the 8-pin MSOP Package Minimizes Board Area and H eight SLUS473B -- NOVEMBER 1999 -- REV ISED OCTOBER 2010 D, OR P PACKAGE (TOP VIEW) DGK PACKAGE (TOP VIEW) ILIM FB VFF DISCH 1 2 3 4 1 ILIM 2 FB 3 VFF 4 DISCH VDD OUT GND RC 8 7 6 5 8 VDD 7 OUT 6 GND 5 RC description The UCC3 5705 and UCC35706 devices are 8-pin vol tage mode primary side controllers with fast over-current protection. These de vices are used as core high-speed build ing blocks in high performance isolated and non-isolated power converters. UCC 35705/UCC35706 devices feature a high s peed oscillator with integrated feed-forward compensation for im.
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