Datasheet

UCC28061
SLUS837A – JUNE 2008 – REVISED JULY 2009 .............................................................................................................................................................. 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 k Ω ; 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 CONDITIONS MIN TYP MAX UNIT
PULSE-WIDTH MODULATOR
K
TL
On-time factor, phases A and B VINAC = 3.2 V, VSENSE = 5.8 V
(3)
3.6 4.0 4.4
µ s/V
VINAC = 3.2 V, VSENSE = 5.8 V,
K
TLS
On-time factor, single-phase, A 7.2 8 8.9
PHB = 0 V
(3)
Phase B to phase A on-time matching VSENSE = 5.8 V, VINAC = 3.2 V – 6% 6%
COMP = 0.25 V, VINAC = 1 V 1.2 2 2.7
Zero-crossing distortion correction additional on
µ s
time
COMP = 0.25 V, VINAC = 0.1 V 12.6 20 29
PHB threshold falling, to single-phase operation To GDB output shutdown VINAC = 1.5 V 0.7 0.8 0.9
V
PHB threshold rising, to two-phase operation To GDB output running VINAC = 1.5 V 0.9 1.0 1.1
T
(min)
Minimum switching period R
TSET
= 133 k Ω
(3)
1.7 2.2 2.5
µ s
PWM restart time ZCDA = ZCDB = 2 V
(4)
165 200 265
THERMAL SHUTDOWN
Thermal shutdown temperature T
J
, temperature rising
(5)
+160
° C
Thermal restart temperature T
J
, temperature falling
(5)
+140
(3) Gate drive on-time is proportional to V
COMP
– 125 mV. The on-time proportionality factor, K
T
, is different in two-phase and single-phase
modes. The on-time factor, K
T
, scales linearly with the value of R
TSET
. The minimum switching period is proportional to R
TSET
.
(4) 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.
(5) 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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