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UCC2570 Datasheet(PDF) 3 Page - Texas Instruments

Part # UCC2570
Description  Low Power Pulse Width Modulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC2570 Datasheet(HTML) 3 Page - Texas Instruments

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UCC1570
UCC2570
UCC3570
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0 to 70°C for the
UCC3570, TA= –40 to 85°C for the UCC2570, TA=–55 to 125°C for the UCC1570, RISET=100k, RSLOPE=121k, CFREQ=180pF,
CRAMP=150pF, VCC=11V and TA=TJ.
PARAMETER
TEST CONDITIONS
Min
Typ
Max
Units
Line Sense
Vth High Line Comparator
3.9
4
4.1
V
Vth Low Line Comparator
0.96
1
1.04
V
lib (VFWD)
0
±100
nA
Oscillator
Frequency
90
100
110
kHz
Ramp Generator
IRAMP/ISLOPE
9
10
11
A/A
–IRAMP/IISET
9
10
11
A/A
Peak Ramp Voltage
3.8
4
4.2
V
Valley Ramp Voltage
0.95
1
1.05
V
ISET Voltage Level
0.95
1
1.05
V
Soft Start
Saturation
VCC = 11V, VCC Comparator Off
25
100
mV
ISOFTST/IISET
0.8
1
1.2
A/A
Pulse Width Modulator
lib(FEEDBK)
0
±100
n A
FEEDBK
Zero Duty Cycle
0.9
1
1.1
V
Maximum Duty Cycle, (Note 1)
3.8
4
4.2
V
Current Limit
lib(CURLIM)
0
±100
nA
Vth Current Limit
180
200
220
mV
Vth Shutdown
500
600
700
mV
Fault Counter
Vth
3.8
4
4.2
V
Vsat
0
100
mV
ICOUNT/IISET
0.8
1
1.2
A/A
Output Driver
Vsat High
IOUT = –100mA
0.4
1
V
Vsat Low
IOUT = 100mA
0.4
1
V
Rise/Fall Time
COUT = 1nF, (Note 1)
20
100
ns
Note 1: This parameter guaranteed by design but not 100% tested in production.
VCC: Chip supply voltage pin. Bypass to PGND with a
low ESL/ESR 0.1
µF capacitor plus a capacitor for gate
charge storage. Lead lengths must be minimum.
PGND: Ground pin for the output driver. Keep connec-
tions less than 2cm. Carefully maintain low impedance
path for high current return.
OUT: Gate drive output pin. Connect to the gate of a
power MOSFET with a resistor greater than 2
Ω. Keep
connection lengths under 2cm.
VFWD: Voltage Feed Forward and Line Sense pin. Con-
nect to input DC line using a resistive divider.
SLOPE: Program the charging current for RAMP with a
resistor from this pin to GND. This pin will follow VFWD.
FEEDBK: Input to the pulse width modulator comparator.
Drive this pin with an optocoupler to GND and a resistor
to VREF. Modulation input range is from 1V to 4V.
ISET: A resistor from this pin to GND programs RAMP
discharge current, FREQ current, SOFTST current, and
COUNT current.
PIN DESCRIPTIONS


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