Datasheet

UCC28089
SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006
4
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ELECTRICAL CHARACTERISTICS:
T
A
=--40°C to 105°C for UCC28089, V
DD
=9V(seeNote1),1μF capacitor from VDD to GND, RA = 110 kΩ, RB = 182 Ω, CT = 220 pF, T
A
=T
J
,
(unless otherwise noted).
PARAMETER
TEST CONDITION
MIN TYP MAX UNITS
Overall Section
Startup current VDD < UVLO start threshold (see Note 2) 130 260 μA
Operating supply current CS = 0 V, (see Note 1, Note 2) 1.4 2.0 mA
Undervoltage Lockout
Start threshold SeeNote1 9.5 10.5 11.5
Minimum operating voltage after start 7.4 8.0 8.4
V
Hysteresis 2.1 2.5 2.9
V
Oscillator
Oscillator frequency 2 x OUTx frequency, Measured at output(s) 180 200 220 kHz
Current Sense
Current Shutdown threshold Resetting current limit 0.650 0.725 0.800 V
CS to output delay CS from 0 mV to 900 mV 45 100 ns
Output
D
e
a
d
T
i
m
e
Measured at OUTA or OUTB 90 100 110
n
s
Dead Time
Over temperature 80 125
ns
Minimum duty cycle CS = 0.9 V 0 %
VOL (OUTA or OUTB) I
OUT
=75mA 0.5 1
V
VOH (OUTA or OUTB) I
OUT
=--35mA,(VDD–VOUT) 1.0 1.3
V
Output resistance high T
A
=25°CI
OUT
= --1 mA (see Note 4) 70 80 90
T
A
= full range I
OUT
= --1 mA (see Note 4) 40 80 135
Ω
Output resistance low T
A
=25°CI
OUT
= 1 mA (see Note 4) 6.5 7.5 8.5
Ω
T
A
= full range I
OUT
= 1 mA (see Note 4) 4 7.5 14
tr, Rise Time C
LOAD
=1nF 28 50
n
s
tf, Fall Time C
LOAD
=1nF 13 30
ns
SYNC
SYNC duration Measured at SYNC pin 75 95 115
tr, delay Rising SYNC until falling OUTA or OUTB 0 8.5 30
ns
tf, delay Falling SYNC until rising OUTA or OUTB 0 14 50
n
s
SYNC V
OH
I
SYNC
= --5 mA (VDD – VSYNC) 0.3 1
V
SYNC V
OL
I
SYNC
=5mA 0.3 1
V
tr, Rise Time C
LOAD
= 100 pF 15 30
n
s
tf, Fall Time C
LOAD
= 100 pF 15 30
ns
Soft Start & Fault
OUTA/OUTB start delay time Cycles as measured at CT pin 57 59 62
OUTA/OUTB soft start duration
First output stage cycle to first full output stage cycle,
CS ≤ 0.6 V
4 5 7
cycles
NOTES: 1. Set VDD above the start threshold before setting at 9V.
2. Does not include current of the external oscillator network.
3. Ensured by design. Not 100% tested in production.
4. The pullup / pulldown circuits of the driver are bipolar and MOSFET transistors in parallel. The output resisstance is the RDS(ON)
of the MOSFET transistor when the voltage of the driver output is less than the saturation voltage of the bipolar transistor.