Datasheet

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   
SLUS517C − DECEMBER 2002 − REVISED SEPTEMBER 2005
5
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ELECTRICAL CHARACTERISTICS
T
A
= –40°C to 105°C for the UCC2851x, T
A
= T
J
, VCC = 12 V, R
T
= 156 kΩ, R
CT_BUFF
= 10 kΩ
(unless otherwise noted)
current amplifier
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input offset voltage V
CM
= 0 V, V
CAOUT
= 3 V –5 0 5 mV
Input bias current V
CM
= 0 V, V
CAOUT
= 3 V −50 −100
nA
Input offset current V
CM
= 0 V, V
CAOUT
= 3 V 25 100
nA
Open loop gain V
CM
= 0 V, 2 V ≤ V
CAOUT
≤ 5 V 90
dB
Common−mode rejection ratio 0 V ≤ V
CM
≤ 1.5 V, V
CAOUT
= 3 V 80
dB
High-level output voltage I
LOAD
= –500 µA 5.6 6.3 7.0
V
Low-level output voltage I
LOAD
= 500 µA 0 0.2 0.5
V
Gain bandwidth product
(1)
See Note 1 2.0 MHz
oscillator
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
f
PWM
, PWM frequency, initial accuracy T
A
= 25°C 170 200 230 kHz
Frequency, voltage stability 10.8 V ≤ V
CC
≤ 15 V −1% 1%
Frequency, total variation Line, Temp 160 240 kHz
dc-to-dc ramp peak voltage 4.5 5.0 5.5
dc-to-dc ramp amplitude voltage
(1)
(peak-to-peak)
4.0
V
PFC ramp peak voltage 4.5 5.0 5.5
V
PFC ramp amplitude voltage (peak-to-peak) 3.5 4.0 4.5
voltage reference
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input voltage
25°C 7.39 7.50 7.61 V
Input voltage
Over temperature 7.35 7.50 7.65 V
Load regulation I
REF
= −1 mA to −6 mA 5 15
mV
Line regulation 10.8 V ≤ V
CC
≤ 15 V 1 10
mV
Short circuit current VREF = 0V −20 –25 −50 mA
peak current limit
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
PKLMT reference voltage –20 0 20 mV
PKLMT propagation delay PKLMT to GT1 150 300 500 ns
multiplier
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
I
MOUT
, high-line low-power output current I
AC
= 500 µA, VFF = 4.7 V, VAOUT = 1.25 V −3 –6 −9
I
MOUT
, high-line high-power output current I
AC
= 500 µA, VFF = 4.7 V, VAOUT = 5 V −75 –90 −110
I
MOUT
, low-line low-power output current I
AC
= 150 µA, VFF = 1.4 V, VAOUT = 1.25 V −10 –15 −50
µA
I
MOUT
, low-line high-power output current I
AC
= 150 µA, VFF = 1.4 V, VAOUT = 5 V −245 –290 −330
µA
I
MOUT
, IAC-limited output current I
AC
= 150 µA, VFF = 1.3 V, VAOUT = 5 V −245 –290 −330
Gain constant (k) I
AC
= 300 µA, VFF = 2.8 V, VAOUT = 2.5 V 0.8 1 1.2 1/V
I
AC
= 150 µA, VFF = 1.4 V, VAOUT = 0.25 V 0 –0.2 µA
I
MOUT
, zero current
I
AC
= 500 µA, VFF = 4.7 V, VAOUT = 0.25 V 0 –0.2 µA
I
MOUT
, zero current
I
AC
= 500 µA, VFF = 4.7 V, VAOUT = 0.5 V 0 –0.2 µA
Power limit (I
MOUT
× V
FF
) I
AC
= 150 µA, VFF = 1.4 V, VAOUT = 5 V −343 –406 −462 µW
1. Ensured by design. Not 100% tested in production.