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UCC39421 Datasheet(PDF) 8 Page - Texas Instruments

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Part # UCC39421
Description  Multimode High Frequency PWM Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC39421 Datasheet(HTML) 8 Page - Texas Instruments

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UCC29421, UCC29422, UCC39421, UCC39422
MULTIMODE HIGHFREQUENCY PWM CONTROLLER
SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power saving modes (continued)
UDG−98107
7
9
8
3
2
4
6
12
5
17
11
20
18
16
19
13
14
15
1
10
+
1.24 V
+
RESET/POR
+
UCC29422
ONLY
1.18 V
+
0.2 V
1.22
+
+
Q
S
R
+
+
70 mV
PFM
1=SLEEP
1.24 V
0.6 V
+
1.24 V
VREF
SLOPECOMP
+
PWM
OSC
VDD
CONTROL
VPUMP
VOUT
1.2 V
+
S
R
Q
Q
Q
R
S
2.5
µS
MUX
A
B
A/B
+
+
PFM DISABLE
COMP
ERROR AMP
PWM
COMP
1 = LP_MODE
ILIM COMP
LEB
0.3 V
30 MHz AMP
+
X10
0.15 V
VOUT>2.5 V
VPUMP >2.5 V
Q
Q
R
S
START−UP
36 mV
ANTI−
CROSS
COND.
VPUMP
1=SD
VIN
VOUT+2 V
VIN
IZERO
PGND
PUMP
SWITCH
CONTROL
VIN
VGD
CLK
SYNC/SD
RT
GND
LOWBAT
VDET
RSADJ
PFM
COMP
FB
PGND
ISENSE
CHRG
RSEL
RECT
RSEN
VOUT
CP
VIN
VPUMP
VDD BIAS
CONTROL
AND UVLO
VDD
ADAPTIVE
ZERO
CURRENT
SENSING
10%−20% OF FULL
LOAD = LP_MODE
85%
DMAX
VGD
RESET
VIN
+
PFM COMP
+
20
µs
DELAY
Figure 2. Detailed Block Diagram


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