Datasheet

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(6) Gain is defined as
ACS +
DV
COM
DV
CS
, 0 V v V
CS
v 900 mV
Electrical Characteristics
UCC28C4x-EP
BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
SGLS352B – DECEMBER 2006 – REVISED MAY 2007
V
DD
= 15 V
(1)
, R
T
= 10 k Ω , C
T
= 3.3 nF, C
VDD
= 0.1 µ F and no load on the outputs, T
A
= T
J
= –55 ° C to 125 ° C for the
UCC28C4x
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Reference
Output voltage, initial accuracy T
A
= 25 ° C , I
OUT
= 1 mA 4.9 5 5.1 V
Line regulation V
DD
= 12 V to 18 V 0.2 20 mV
Load regulation 1 mA to 20 mA 3 25 mV
Temperature stability
(2)
0.2 0.4 mV/ ° C
Total output variation
(2)
4.82 5.18 V
Output noise voltage 10 Hz to 10 kHz, T
A
= 25 ° C 50 µ V
Long term stability 1000 hours, T
A
= 125 ° C
(2)
5 25 mV
Output short circuit –30 –45 –55 mA
Oscillator
T
A
= 25 ° C
(3)
50.5 53 55 kHz
Initial accuracy
T
A
= Full Range
(3)
50.5 57 KHz
Voltage stability V
DD
= 12 V to 18 V 0.2 2.85 %
Temperature stability T
MIN
to T
MAX
(2)
1 2.5 %
Amplitude RT/CT pin peak to peak 1.9 V
T
A
= 25 ° C, RT/CT = 2 V
(4)
7.7 8.4 9 mA
Discharge current
RT/CT = 2 V
(4)
7.2 8.4 9.5 mA
Error Amplifier
Feedback input voltage, initial accuracy V
COMP
= 2.5 V, T
A
= 25 ° C 2.475 2.500 2.525 V
Feedback input voltage, total variation V
COMP
= 2.5 V 2.45 2.50 2.55 V
Input bias current –0.1 –2 µ A
A
VOL
Open-loop voltage gain V
OUT
= 2 V to 4 V 65 90 dB
Unity gain bandwidth 1.5 MHz
PSRR Power-supply rejection ratio V
DD
= 12 V to 18 V 60 dB
Output sink current V
FB
= 2.7 V, V
COMP
= 1.1 V 2 14 mA
Output source current V
FB
= 2.3 V, V
COMP
= 5 V –0.5 –1 mA
V
OH
High-level output voltage V
FB
= 2.3 V, R
LOAD
= 15 k to GND 5 6.8 V
V
OL
Low-level output voltage V
FB
= 2.7 V, R
LOAD
= 15 k to VREF 0.1 1.1 V
Current Sense
T
A
= 25 ° C
(5) (6)
2.85 3 3.15 V/V
Gain
T
A
= Full Range
(5) (6)
2.825 3.15 V/V
Maximum input signal V
FB
< 2.4 V 0.9 1 1.1 V
PSRR Power-supply rejection ratio V
DD
= 12 V to 18 V
(2) (5)
70 dB
Input bias current –0.1 –2 µ A
CS to output delay 35 70 ns
COMP to CS offset V
CS
= 0 V 1.15 V
Output
V
OUT
low (R
DS(on)
pull-down) I
SINK
= 200 mA 5.5 15 Ω
V
OUT
high (R
DS(on)
pull-up) I
SOURCE
= 200 mA 10 25 Ω
(1) Adjust V
DD
above the start threshold before setting at 15 V.
(2) Not production tested.
(3) Output frequencies of the UCC28C41, UCC28C44, and UCC28C45 are one-half the oscillator frequency.
(4) Oscillator discharge current is measured with R
T
= 10 k Ω to V
REF
.
(5) Parameter measured at trip point of latch with V
FB
= 0 V.
4
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