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UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F?SEPTEMBER 2002 ? REVISED MARCH 2009
description (continued)
In the transition mode operation, the PWM circuit is self-oscillating with the turn-on being governed by an
inductor zero-current detector (ZCD pin) and the turn-off being governed by the current-sense comparator.
Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection
(OVP) and enable.
The UCC38050 and UCC38051, while being pin compatible with other industry controllers providing similar
functionality, offer many feature enhancements and tighter specifications, leading to an overall reduction in
system implementation cost. The system performance is enhanced by incorporation of zero power detect
function which allows the controller output to shut down at light load conditions without running into overvoltage.
The device also features innovative slew rate enhancement circuits which improve the large signal transient
performance of the voltage error amplifier. The low start-up and operating currents of the device results in low
power consumption and ease of start-up. Highly accurate internal bandgap reference leads to tight regulation
of output voltage in normal and OVP conditions, resulting in higher system reliability. The enable comparator
ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low.
There are two key parameteric differences between UCC38050 and UCC38051. The UVLO turn-on threshold
of UCC38050 is 15.8 V while for UCC38051 it is 12.5 V. Secondly, the g M amplifier ’s source current for
UCC38050 is typically 1.3 mA while for UCC38051 it is 300 μ A. The higher UVLO turn-on threshold of the
UCC38050 allows quicker and easier start-up with a smaller V CC capacitance while the lower UVLO turn-on
threshold of UCC38051 allows the operation of the PFC chip to be easily controlled by the downsteam PWM
controller in two-stage power converters. The UCC38050 g M amplifier also provides a full 1.3-mA typical source
current for faster start-up and improved transient response when output is low either at start-up or during
transient conditions. The UCC38051 scales this source current back down to 300- μ A typical source current to
gradually increase the error voltage preventing a step increase in line currents at start-up but still provides good
transient response. The UCC38051 is suitable for multiple applications including AC adapters where a
two-stage power conversion is needed. The UCC38050 is suitable for applications such as electronic ballasts
where there is no down-stream PWM conversion and the advantages of smaller V CC capacitor and improved
transient response can be realized.
Devices are available in either the industrial temperature range of –40 ° C to 105 ° C (UCC2805x) or commercial
temperature range of 0 ° C to 70 ° C (UCC3805x). Package offerings are 8-pin SOIC (D) or 8-pin PDIP (P)
packages.
ORDERING INFORMATION
UVLO Threshold
g M Amplifier
Packaged Devices (1)
T A = T J
?40 ° C to 105 ° C
0 ° C to 70 ° C
Voltage ON/OFF
(V)
15.8 / 9.7
12.5 / 9.7
15.8 / 9.7
12.5 / 9.7
Source Current
( μ A)
?1300
?300
?1300
?300
SOIC-8 (D)
UCC28050D
UCC28051D
UCC38050D
UCC38051D
PDIP-8 (P)
UCC28050P
UCC28051P
UCC38050P
UCC38051P
2
(1)
D (SOIC-8) package is available taped and reeled. Add R suffix to device type (e.g.
UCC28050DR) to order quantities of 2,500 devices per reel.
www.ti.com
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