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UCC2541 Datasheet(PDF) 10 Page - Texas Instruments

Part # UCC2541
Description  HIGH-EFFICIENCY SYNCHRONOUS BUCK PWM CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC2541 Datasheet(HTML) 10 Page - Texas Instruments

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UCC2541
SLUS621A − AUGUST 2004 − SEPTEMBER 2005
10
www.ti.com
APPLICATION INFORMATION
RLOAD
RS
RI1
RV1
RI2
RV2
RFI
CFI
RFV
CFV
ZFV
ZIV
CFIR
VERR to
1.5 V
VEA−
7
8
9
CEA−
UCC2541
+
+
+
Voltage
Error
Amplifier
COMP
Modulator
Current
Error
Amplifier
C
+
SS
TR
R
+
1.5 R
50 mV
ZFV
ZIV
From Power MOSFET
Switch Node
1.5 V
Inverting
Amplifier
0.7 V
CST
Figure 3. Error Amplifier Configuration
Component selection includes setting the voltage regulation threshold, then the current limit threshold, as
described below.
Voltage vs. Current Programming (refer to Figure 3):
1.
Determine the ratio
R
V1
R
V2
+
V
LOAD(reg)
V
VEA
* ) Threshold Voltage
* 1V +
V
LOAD(reg)
1.5 V (typ)
* 1V
2.
Sense resistor R
S +
1
)
R
V1
R
V2
V
CEA
)offset voltage
I
S(max)
, where IS(max) is the current limit level,
VCEA+offset = 50 mV (typ).
3.
Arbitrarily select either RV1 or RV2 so that the smallest of the two resistors is between 6.5 kΩ and 20 kΩ.
Then calculate the value of the other resistor using the equation in the first step.
If the converter is in a current-limit condition and the output voltage falls below half of the regulated output
voltage, the UCC2541 enters into a hiccup (restart-retry) mode. Figure 4 shows typical signals during hiccup
mode.


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