Datasheet

UCC28070
SLUS794E –NOVEMBER 2007–REVISED APRIL 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range −40°C < T
A
< 125°C, T
J
= T
A
, VCC = 12 V, GND = 0 V, R
RT
= 75 kΩ, R
DMX
= 68.1
kΩ, R
RDM
= R
SYN
= 100 kΩ, C
CDR
= 2.2 nF, C
SS
= C
VREF
= 0.1 μF, C
VCC
= 1 μF, I
VREF
= 0 mA (unless otherwise noted)
SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Over Voltage
Measured as VSENSE (rising) / VSENSE
V
OVP
OVP threshold 104 106 108 %
(regulation)
OVP hysteresis Measured at VSENSE (falling) 100 mV
Measured between VSENSE (rising) and
OVP propagation delay 0.2 0.3 μs
GDx (falling)
Zero-Power
V
ZPWR
Zero-power detect threshold Measured at VAO (falling) 0.65 0.75
V
Zero-power hysteresis 0.15
Multiplier
VAO ≥ 1.5 V, T
A
= 25°C 16 17 18
VAO = 1.2 V, T
A
= 25°C 14.5 17.0 19.5
k
MULT
Gain constant
VAO ≥ 1.5 V 15 17 19
μA
VAO = 1.2 V 13 17 21
VINAC = 0.9 V
PK
, VAO = 0.8 V -0.2 0 0.2
I
IMO
Output current: zero
VINAC = 0 V, VAO = 5 V -0.2 0 0.2
Quantized Voltage Feed Forward
V
LVL1
Level 1 threshold
(3)
0.6 0.7 0.8
V
LVL2
Level 2 threshold 1
V
LVL3
Level 3 threshold 1.2
V
LVL4
Level 4 threshold 1.4
Measured at VINAC (rising) V
V
LVL5
Level 5 threshold 1.65
V
LVL6
Level 6 threshold 1.95
V
LVL7
Level 7 threshold 2.25
V
LVL8
Level 8 threshold 2.6
Current Amplifiers
CAOx high voltage 5.75 6
V
CAOx low voltage 0.1
g
MC
CAOx transconductance 100 μS
CAOx sink current, overdriven 50
μA
CAOx source current, overdriven −50
Input common mode range 0 3.6 V
RSYNTH = 6 V, T
A
= 25°C -4 -8 -13
Input offset Voltage mV
RSYNTH = 6 V 0 -8 -20
Input offset voltage 0 −8 −20
mV
Measured as Phase A’s input offset minus
Phase mismatch -12 0 12
Phase B’s input offset
CAOx pull-down current VSENSE = 0.5 V, CAOx = 0.2 V 0.5 0.9 mA
(3) The Level 1 threshold represents the “zero-crossing detection” threshold above which VINAC must rise to initiate a new input half-cycle,
and below which VINAC must fall to terminate that half-cycle.
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