Datasheet

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SLUS577C − SEPTEMBER, 2003 − REVISED MARCH 2009
5
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ELECTRICAL CHARACTERISTICS
T
A
= 0°C to 70°C for the UCC3817A and T
A
= −40°C to 85°C for the UCC2817A, T
A
= T
J,
VCC = 12 V, R
T
= 22 kΩ,
C
T
= 270 pF, (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Multiplier Section
I
MOUT
, high line, low power output
current, (0°C to 85°C)
I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 1.25 V 0 −6 −20
I
MOUT
, high line, low power output
current, (−40°C to 85°C)
I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 1.25 V 0 −6 −23
I
MOUT
, high line, high power output
current
I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 5 V −70 −90 −105
µA
I
MOUT
, low line, low power output
current
I
AC
= 150 µA, V
FF
= 1.4 V, VAOUT = 1.25 V −10 −19 −50
µA
I
MOUT
, low line, high power output
current
I
AC
= 150 µA, V
FF
= 1.4 V, VAOUT = 5 V −268 −300 −345
I
MOUT
, IAC limited output current I
AC
= 150 µA, V
FF
= 1.3 V, VAOUT = 5 V −250 −300 −400
Gain constant (K) I
AC
= 300 µA, V
FF
= 3 V, VAOUT = 2.5 V 0.5 1 1.5 1/V
I
MOUT
, zero current
I
AC
= 150 µA, V
FF
= 1.4 V, VAOUT = 0.25 V 0 −2
I
MOUT
, zero current
I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 0.25 V 0 −2
A
I
MOUT
, zero current, (0°C to 85°C) I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 0.5 V 0 −3
µA
I
MOUT
, zero current, (−40°C to 85°C) I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 0.5 V 0 −3.5
Power limit (I
MOUT
x V
FF
) I
AC
= 150 µA, V
FF
= 1.4 V, VAOUT = 5 V −375 −420 −485 µW
Feed-Forward Section
VFF output current I
AC
= 300 µA −140 −150 −160 µA
Soft Start Section
SS charge current −6 −10 −16 µA
Gate Driver Section
Pullup resistance I
O
= –100 mA to −200 mA 9 12
Ω
Pulldown resistance I
O
= 100 mA 4 10
Ω
Output rise time C
L
= 1 nF, R
L
= 10 Ω, V
DRVOUT
= 0.7 V to 9.0 V 25 50
ns
Output fall time C
L
= 1 nF, R
L
= 10 Ω, V
DRVOUT
= 9.0 V to 0.7 V 10 50
ns
Maximum duty cycle 93% 95% 99%
Minimum controlled duty cycle At 100 kHz 2%
Zero Power Section
Zero power comparator threshold Measured on VAOUT 0.20 0.33 0.50 V