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UCC2581DTR Datasheet(PDF) 3 Page - Texas Instruments

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Part # UCC2581DTR
Description  Micropower Voltage Mode PWM
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC2581DTR Datasheet(HTML) 3 Page - Texas Instruments

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3
UCC1581
UCC2581
UCC3581
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 10V, 0.1
µF capacitor
from VDD to GND, 1.0
µF capacitor from REF to GND, RT1 = 680kΩ, RT2 = 12kΩ, CT = 750pF and TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Current Sense Section
Input Bias Current
–150
20
150
nA
Overcurrent Threshold
0.4
0.5
0.6
V
Output Section
OUT Low Level
I = 100mA
0.6
1.2
V
OUT High Level
I = –100mA, VDD – OUT
0.6
1.2
V
Rise/Fall Time
(Note 1)
20
100
ns
Soft start Section
Soft start Current
SS = 2V
–9
–11.5
–14
µA
Chip Enable Section
VIH
1.9
2.0
2.1
V
VIL
1.7
1.8
1.9
V
Hysteresis
180
230
280
mV
Source Current
510
15
µA
Overall Section
Start-Up Current
VDD < Start Threshold
85
130
µA
Operating Supply Current
VC = 0V
300
600
µA
VDD Zener Shunt Voltage
IDD = 10mA
13.5
15
16.5
V
IDD Stand-by Shunt Voltage
EN = 0V
100
150
µA
Note 1: Guaranteed by design. Not 100% tested in production
CT: Oscillator timing capacitor pin. Minimum value is
100pF.
DCMIN: Input for programming minimum duty cycle
where pulse skipping begins. This pin can be grounded
to disable minimum duty cycle feature and pulse
skipping.
EN: Enable input. This pin has an internal 10
µA pull-up.
A logic low input inhibits the PWM output and causes the
soft start capacitor to be discharged.
GND: Circuit ground.
GT: Pin for controlling the gate of an external depletion
mode N-MOSFET for the startup supply. The external
N-MOSFET regulates VDD to 7.5V until the bootstrap
supply comes up, then GT goes low.
ISEN: Input for overcurrent comparator. This function can
be used for pulse-by-pulse current limiting. The threshold
is 0.5V nominal.
OUT: Gate drive output to external N-MOSFET.
REF: 4.0V reference output. A minimum value bypass
capacitor of 1.0
µF is required for stability.
RT1: Resistor pin to program oscillator charging current.
The oscillator charging current is 92
20
1
.
.
• 
V
RT
.
See Application Diagram Fig. 1.
The current into this pin is
20
1
.
V
RT
 .
The value of RT1 should be between 220k and 1M
Ω.
RT2: Resistor pin to program oscillator discharge time.
The minimum value of RT2 is 10k
Ω. See Application
Diagram Fig. 1.
SS: Soft start capacitor pin. The charging current out of
SS is 3.75X the current in RT1.
SYNC: Oscillator synchronization pin. Rising edge
triggered CMOS/TTL compatible input with a 2.1V
threshold. SYNC should be grounded if not used. The
minimum pulse width of the SYNC signal is 100ns.
VC: Control voltage input to PWM comparator. The
nominal control range of VC is 1.0V to 2.5V.
VDD: Chip input power with an 15V internal clamp. VDD
is regulated by startup FET to 7.5V until the bootstrap
voltage comes up. VDD should be bypassed at the chip
with a 0.1
µF minimum capacitor.
PIN DESCRIPTIONS


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