Datasheet

UCC28070
www.ti.com SLUS794E –NOVEMBER 2007–REVISED APRIL 2011
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
Current Synthesizer
VSENSE = 3 V, VINAC = 0 V 2.91 3 3.09
V
RSYNTH
Regulation voltage
VSENSE = 3 V, VINAC = 2.85 V 0.10 0.15 0.20 V
Synthesizer disable threshold Measured at RSYNTH (rising) 5 5.25
VINAC input bias current 0.250 0.500 μA
Peak Current Limit
Peak current limit threshold PKLMT = 3.30 V, measured at CSx (rising) 3.27 3.3 3.33 V
Measured between CSx (rising) and GDx
Peak current limit propagation delay 60 100 ns
(falling) edges
PWM Ramp
V
RMP
PWM ramp amplitude 3.8 4.0 4.2
V
PWM ramp offset voltage T
A
= 25°C, R
RT
= 75 kΩ 0.65 0.7
PWM ramp offset temperature
−2 mV/ °C
coefficient
Gate Drive
GDA, GDB output voltage, high,
VCC = 20 V, C
LOAD
= 1 nF 11.5 13 15
clamped
V
GDA, GDB output voltage, High C
LOAD
= 1 nF 10 10.5
GDA, GDB output voltage, Low C
LOAD
= 1 nF 0.2 0.3
Rise time GDx 1 V to 9 V, C
LOAD
= 1 nF 18 30
ns
Fall time GDx 9 V to 1 V, C
LOAD
= 1 nF 12 25
GDA, GDB output voltage, UVLO VCC = 0 V, I
GDA
, I
GDB
= 2.5 mA 0.7 2 V
Thermal Shutdown
Thermal shutdown threshold 160
°C
Thermal shutdown recovery 140
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