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UCC28511N Datasheet(PDF) 8 Page - Texas Instruments

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Part # UCC28511N
Description  ADVANCED PFC/PWM COMBINATION CONTROLLERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC28511N Datasheet(HTML) 8 Page - Texas Instruments

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UCC28510, UCC28511, UCC28512, UCC28513,
UCC28514, UCC28515, UCC28516, UCC28517
SLUS517C − DECEMBER 2002 − REVISED SEPTEMBER 2005
8
www.ti.com
BLOCK DIAGRAM
VREF
20
14
12
11
9
17
16
GT1
PWRGND
ISENSE1
VCC
VAOUT
1.9 V
PKLMT
7.5 V
REFERENCE
UVLO
16 V, 9.7 V
10.2 V, 9.7 V
VCC
15
Q
S
CAOUT
SS2
gMVOLTAGE
ERROR AMP
8.0 V
13
1
3
VSENSE
VFF
19
IAC
18
MOUT
MIRROR
2:1
7.5 V
ENABLE
PFCOVP
÷
X
X
MULT
CLK1
CURRENT
AMP
6.75 V
GND
10
GT2
VCC
8
CLK2
1.5 V
1.3 V
R
ILIMIT
VERR ISENSE2
ILIMIT
S
Q
UVLO2
PWM
0.33 V
(VFF)
2
ZERO
POWER
PWM STAGE
SOFT START
+
PWM
+
+
+
+
+
7
6
OSC
CLK2
CLK1
+
+
PWM
+
+
PFC
CLK1
CLK2
2
RT
+
D_MAX
4
CT_BUFF
5
D_MAX
COMP
3 V
+
R
R
R
PWM
PFC
PWM
PFC
IRT
PFC:PWM
Frequency
1:1 = IRT
1:2 = 0.5IRT
1x:2x Option Only
DETAILED PIN DESCRIPTIONS
CAOUT (Pin 15): This is the output of a wide-bandwidth operational amplifier that senses line current and
commands the PFC stage PWM comparator to force the correct duty cycle. This output can swing close to GND
to command maximum duty cycle, and above the PFC ramp peak voltage to force zero duty cycle when
necessary. Connect current loop compensation components between CAOUT and MOUT.
CT_BUFF (Pin 5): The 4-V amplitude oscillator ramp is internally buffered at this pin to allow a resistor to be
connected directly from this pin to ISENSE2 for slope compensation. The internal buffer can drive a typical
500-
µA resistive load at this pin.
D_MAX (Pin 4): Program the maximum duty cycle at GT2 by applying a dc voltage to this pin. Between 0.09
and 0.90, the maximum duty ratio is linearly related to D_MAX. Usually, this voltage is set with a precision
resistor divider powered by VREF. A first order approximation, with the CT_BUFF frequency near 200 kHz, is
estimated by:
D
MAX ^
V
DX * 1.15 V
4V
where, DMAX is a dimensionless ratio
VDX is the voltage at D_MAX in volts
This pin can also be used to set DMAX to 0 by setting VDX less than 0.7 V.


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