Datasheet

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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009
4
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electrical characteristics, T
A
= 0°C to 70°C for the UCC3817 and T
A
= −40°C to 85°C for the UCC2817, T
A
= T
J,
VCC = 12 V, R
T
= 22 kΩ, C
T
= 270 pF, (unless otherwise noted)
voltage reference section
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input voltage
T
A
= 0°C to 70°C 7.387 7.5 7.613 V
Input voltage
T
A
= −40°C to 85°C 7.369 7.5 7.631 V
Load regulation I
REF
= 1 mA to 2 mA 0 10 mV
Line regulation VCC = 10.8 V to 15 V, See Note 2 0 10 mV
Short-circuit current V
REF
= 0 V −20 −25 −50 mA
NOTES: 2. Reference variation for V
CC
< 10.8 V is shown in Figure 8.
oscillator section
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Initial accuracy T
A
= 25°C 85 100 115 kHz
Voltage stability VCC = 10.8 V to 15 V −1 1 %
Total variation Line, temp 80 120 kHz
Ramp peak voltage 4.5 5 5.5 V
Ramp amplitude voltage
(peak to peak)
3.5 4 4.5 V
peak current limit section
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
PKLMT reference voltage −15 15 mV
PKLMT propagation delay 150 350 500 ns
multiplier section
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
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 µA
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 µA
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 µA
I
MOUT
, IAC limited output current I
AC
= 150 µA, V
FF
= 1.3 V, VAOUT = 5 V −250 −300 −400 µA
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 µA
I
MOUT
, zero current
I
AC
= 500 µA, V
FF
= 4.7 V, VAOUT = 0.25 V 0 −2 µA
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 µA
Power limit (I
MOUT
x V
FF
) I
AC
= 150 µA, V
FF
= 1.4 V, VAOUT = 5 V −375 −420 −485 µW