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UCC28811DG4 Datasheet(PDF) 7 Page - Texas Instruments

Part # UCC28811DG4
Description  LED LIGHTING POWER CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC28811DG4 Datasheet(HTML) 7 Page - Texas Instruments

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BLOCK DESCRIPTION
BLOCK DIAGRAM
1
2
5
6
7
8
3
4
40 kW
5 pF
+
+
+
x
x
K
2.5 V
2.3 V
+
+
OVP
Enable
2.7/2.5 V
g
M VEA
0.67/0.57 V
0.23/0.15 V
Current Sense Comparator
S
Q
Q
R
+
Restart Timer
+
V
REF and
Bias Reg
V
REF
Init. Bias
1.7/1.4 V
UVLO
V
REF
GOOD
OVP
VSENSE
EAOUT
VINS
ISENSE
TZE
GND
GDRV
VDD
REF
Zero Energy
Detect
UDG-08130
75 mV
Current
Reference
Generator
UVLO and Reference Circuit
Error Amplifier
UCC28810
UCC28811
www.ti.com.............................................................................................................................................................................................. SLUS865 – OCTOBER 2008
This circuitry generates a precision reference voltage used to obtain a tightly controlled UVLO threshold. In
addition to generating a 2.5-V reference for the noninverting terminal of the gM amplifier, it generates the
reference voltages for OVP, enable, zero energy detect and the current reference generator circuits. An internal
rail of 7.5 V is also generated to drive all the internal circuitry.
The voltage error amplifier in the UCC2881x is a transconductance amplifier with a typical transconductance
value of 90
µS. The advantage in using a transconductance amplifier is that the inverting input of the amplifier is
solely determined by the external resistive-divider from the output voltage and not the transient behavior of the
amplifier itself. This allows the VSENSE pin to be used for sensing over voltage conditions.
The sink and source capability of the error amplifier is approximately 10
µA during normal operation of the
amplifier. But when the VSENSE pin voltage is beyond the normal operating conditions (VVSENSE >1.05 × VREF,
VVSENSE < 0.88 × VREF), additional circuitry to enhance the slew-rate of the amplifier is activated. Enhanced
slew-rate of the compensation capacitor results in a faster start-up and transient response. This prevents the
output voltage from drifting too high or too low, which can happen if the compensation capacitor were to be
driven by the normal drive current of 10-
µA. When VSENSE rises above the normal range, the enhanced sink
current capability increases to 1 mA, nominal. When VSENSE falls below the normal range, the UCC28810 can
source more than 1 mA and the UCC28811 sources approximately 300
µA. The limited source current in the
UCC28811 helps to gradually increase the error voltage on the EAOUT pin preventing a step increase in line
current. The actual rate of increase of the voltage on the EAOUT pin is dependent on the compensation network
externally connected to the EAOUT pin.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): UCC28810 UCC28811


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