Datasheet

UCC28063
SLUSAO7 – SEPTEMBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At VCC = 16 V, AGND = PGND = 0 V, VINAC = 3 V, VSENSE = 6 V, HVSEN = 3 V, PHB = 5 V, R
TSET
= 133 kΩ, all voltages
are with respect to GND, all outputs unloaded, −40°C < T
J
= T
A
< 125°C, and currents are positive into and negative out of
the specified terminal, unless otherwise noted.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
VINAC Input
I
VINAC
VINAC input bias current, VINAC = 2 V
±0.03 ±0.5 µA
above brownout
V
BODET
VINAC brownout detection VINAC falling
1.33 1.39 1.44 V
threshold
t
BODLY
VINAC brownout filter time VINAC below the brownout detection
340 440 540 ms
threshold for the brownout filter time
V
BOHYS
VINAC brownout threshold VINAC rising
30 62 75 mV
hysteresis
I
BOHYS
VINAC brownout hysteresis VINAC = 1 V for > t
BODLY
1.6 2 2.5 µA
current
V
DODET
VINAC dropout detection VINAC falling
0.315 0.35 0.38 V
threshold
t
DODLY
VINAC dropout filter time VINAC below the dropout detection
3.5 5 7.0 ms
threshold for the dropout filter time
V
DOCLR
VINAC dropout clear threshold VINAC rising 0.67 0.71 0.75 V
Pulse-Width Modulator
K
T
On-time factor, phases A and B VSENSE = 5.8 V
(4)
3.6 4.0 4.4
µs/V
K
TS
On-time factor, single-phase, A VSENSE = 5.8 V, PHB = 0 V
(4)
7.2 8.0 8.9
Phase B to phase A on-time VSENSE = 5.8 V
±2% ±6%
matching error
Zero-crossing distortion COMP = 0.25 V, VINAC = 1 V 1.2 2 2.8
µs
correction additional on time
COMP = 0.25 V, VINAC = 0.1 V 12.6 20 29
V
PHBF
PHB threshold falling, to To GDB output shutdown, VINAC = 1.5 V
0.7 0.8 0.9
single-phase operation
V
V
PHBR
PHB threshold rising, to To GDB output running, VINAC = 1.5 V
0.9 1.0 1.1
two-phase operation
T
MIN
Minimum switching period R
TSET
= 133 kΩ
(4)
1.7 2.2 3.0
µs
T
START
PWM restart time ZCDA = ZCDB = 2 V
(5)
165 210 265
Thermal Shutdown
T
J
Thermal shutdown temperature Temperature rising
(6)
160
°C
T
J
Thermal restart temperature Temperature falling
(6)
140
(4) Gate drive on-time is proportional to (V
COMP
– 0.125 V). The on-time proportionality factor, K
T
, scales linearly with the value of R
TSET
and is different in two-phase and single-phase modes. The minimum switching period is proportional to R
TSET
.
(5) An output on-time is generated at both GDA and GDB if both ZCDA and ZCDB negative-going edges are not detected for the restart
time. In single-phase mode, the restart time applies for the ZCDA input and the GDA output.
(6) Thermal shutdown occurs at temperatures higher than the normal operating range. Device performance above the normal operating
temperature is not specified or assured.
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