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UCC2540 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. UCC2540
Description  HIGH EFFICIENCY SECONDARY SIDE SYNCHRONOUS BUCK PWM CONTROLLER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC2540 Datasheet(HTML) 4 Page - Texas Instruments

 
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UCC2540
SLUS539A − JUNE 2004 − REVISED AUGUST 2004
4
www.ti.com
ELECTRICAL CHARACTERISTICS
VDD = 12 V, 1-µF capacitor from VDD to GND, 1-µF capacitor from BST to SW, 1-µF capacitor from REF to GND, 0.1-µF and 2.2-µF capacitors
from VDRV to PGND, fSYNCIN = 200 kHz, TA = TJ = −40°C to 105°C, (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OVERALL
IVDD
Operating current
DC
8
11
13
mA
IVDD
Operating current
fS = 200 kHz,
CLOAD = 2.2 nF
9
12
30
mA
UNDERVOLTAGE LOCKOUT
VVDD
Start threshold voltage
MODE 1
8.0
8.5
9.0
VVDD
Stop threshold voltage
MODE 1
7.5
8.0
8.5
VVDD
Hysteresis
MODE 1
0.3
0.5
0.8
VVDRV
Start threshold voltage
MODE 2,
VVDD = 4 V
4.30
4.65
4.85
VVDRV
Stop threshold voltage
MODE 2
4.0
4.3
4.6
V
VVDRV
Hysteresis
MODE 2
0.15
0.35
0.55
V
VREF
Start threshold voltage
MODE 3
VVDD= VVDRV= 2.7 V
2.75
3.00
3.20
VREF
Stop threshold voltage
MODE 3
2.25
2.50
2.70
VREF
Hysteresis
MODE 3
0.3
0.5
0.8
VOLTAGE REFERENCE (REF)
VREF
Reference output voltage
TA = 25°C
3.28
3.30
3.32
V
VREF
Reference output voltage
Total variation
3.2
3.3
3.4
V
ISC
Short circuit current
VREF = 0 V,
TA = 25°C
10
13
20
mA
Line regulation
5.25 V
≤ VREF ≤ 7.2 V
0
1.5
15
mV
Load regulation
0 mA
≤ IREF ≤ 5 mA
0
30
70
mV
PWM (RAMP)
DMIN
Minimum duty cycle
0%
VRAMP
Offset voltage
0.10
0.25
0.45
V
Timeout threshold voltage
2.3
2.5
2.8
V
tDEAD
G1 deadtime at maximum duty cycle ratio
fSYNC = 200 kHz
150
175
200
ns
IRAMP
Ramp charge current
RRSET = 10 kΩ
−325
−300
−275
µA
CURRENT ERROR AMPLIFIER
VCEA+
Offset voltage
Total variation
45
50
55
mV
GBW
Gain bandwidth(3)
3
4
MHz
VOL
Low-level output voltage
ICOMP = 0 A,
VCEA− = 3.3 V,
VVEA− = 2.0 V
0.1
V
VOL
Low-level output voltage
ICOMP = 200 µA, VCEA− = 1.5 V
VVEA− = 1 V
0
0.60
0.83
V
VOH
High-level output voltage
ICOMP = 0 A,
VCEA− = 0 V,
VVEA− = 1 V
2.2
2.5
3.0
V
AVOL
Open loop
60
100
140
dB
IBIAS
Bias current
−200
−80
−10
nA
ISINK
Sink current
VCOMP = 1.0 V,
VCEA− = 1.5 V,
VVEA− = 0 V
0.35
0.80
1.70
mA
CMR
Common mode input range(3)
0
2
V
(3) Ensured by design. Not production tested.


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