UCC3960D ,Primary Side Startup Controllermaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
UCC3960P ,Primary Side Startup Controllerfeatures such as multimodeovercurrent protection, volt-second clamp, programmable overvoltage and u ..
UCC3961D ,Advanced Primary Side Startup Controller . / SLUS431A – MAY 2000 – REVISED DECEMBER 2000 Opera ..
UCC3972 ,BiCMOS Cold Cathode Fluorescent Lamp Driver Controllerfeatures as a feedback controlled PWM driver stage, open lamp pro-• PWM Frequency Synchronized tote ..
UCC3972PW ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerUCC1972/3UCC2972/3UCC3972/3BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972PWTR ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerFEATURES DESCRIPTION• 1mA Typical Supply Current Design goals for a Cold Cathode Fluorescent Lamp ( ..
UPB551C ,150 Mhz PrescalerBLOCK DIAGRAM (Top View)
CONNECTION DIAGRAM
Pin Number Symbol Function
1 VCC Power Supply (V ..
UPB553AC ,Low Power Prescalersu... A f 199]
NEC 150 MHz DIVIDE-BY-16/17
LOW POWER PRESCALERS UPB553AC
DESCRIPTION
. _ ..
UPB556C ,150 Mhz Divide By 16/17 Low Power PrescalerFEATURES
0 High frequency operation: 150 MHz (+16)
130 MHz (+17)
NEC's original pulse swallowi ..
UPB571C ,500 MHz DUAL-MODULUS PRESCAPERJ51}! f 7 799'
NEC®
500 MHz DUAL-MODULUS
PRESCALER UPB571C
DESCRIPTION
The UPBS71C is ..
UPB581B , DIVIDE- BY- 2 PRESCALER
UPB581C ,3 GHz INPUT DIVIDE BY 2 PRESCALER IC FOR DBS TUNERSDATA SHEETBIPOLAR DIGITAL INTEGRATED CIRCUITμ μPB1508GVμ μ3 GHz INPUT DIVIDE BY 2 PRESCAL ..
UCC3960D-UCC3960P
Primary Side Startup Controller
Duty-Cycle Clamping Up to 400-kHz Synchronizable Switching
Frequency High-Current FET Drive (1.5-A Sink, 0.75-A
Source) Overcurrent Protection Undervoltage Lockout with 2-V Hysteresis Low-Current Startup
descriptionThe UCC3960 primary-side startup controller is a unique solution that provides all the primary-side functions
required for a single-ended, isolated offline, switch-mode power converter that uses secondary-side PWM
control. It is usable with a wide range of secondary circuits and is especially well suitable for systems where
sophisticated handling of overload conditions is required.
Secondary-side control assumes that output voltage and current measurements are interfaced directly to an
output ground-referenced PWM stage that develops the power switch command for the supply. This digital
PWM command can then be transmitted to the primary-side power switch through a simple and low-cost
isolating pulse transformer. With secondary-side control, it is much easier to monitor and control the system load
with tightly coupled analog control loops. Load-oriented features such as output current sharing and
synchronous rectification are implemented more easily.
The UCC3960 provides all the circuitry required on the primary side of a secondary–side controlled power
supply. It features a free running 60-kHz to 360-kHz oscillator that is synchronizable to the secondary-side PWM
signal and also has the ability to accept start/stop PWM commands from the isolating pulse edge transformer.
The use of an extremely small and low-cost pulse transformer allows for higher converter bandwidth. This also
eliminates the loop-gain variations due to initial accuracy and aging of an opto-coupler feedback element or the
size penalty of a gate transformer. It also includes an undervoltage lockout circuit with 2-V hysteresis, a low
current startup with active low during UVLO, a soft-start capability, a 5-V reference and a high current power
output.
In a non-typical use, the UCC3960 can accommodate an analog feedback signal through an opto-isolator where
it can operate in voltage-mode control mode with primary-side peak current limiting.
The UCC3960 and the UCC2960 are available in the 8-pin SOIC (D) and PDIP (P) packages. A 14-pin package
version is available as UCC2961 and UCC3961 that includes additional protection features such as multimode
overcurrent protection, volt-second clamp, programmable overvoltage and undervoltage sense lines, and the
self-bias regulator.
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.
FEED
SOFT
START
FREQ
SET
GND
OUT
REF
VDD
Figure 1
