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UCC28C40 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. UCC28C40
Description  BICMOS LOW POWER CURRENT MODE PWM CONTROLLER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28C40 Datasheet(HTML) 3 Page - Texas Instruments

 
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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458C − AUGUST 2001 − REVISED SEPTEMBER 2003
3
www.ti.com
electrical characteristics VDD = 15 V (See Note 1), RT = 10 kΩ, CT = 3.3 nF, CVDD = 0.1µF and no load
on the outputs, TA = −40°C to 105°C for the UCC28C4x and TA = 0°C to 70°C for the UCC38C4x,
TA = TJ (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Reference Section
Output voltage, initial accuracy
TA = 25°C
IOUT = 1mA
4.9
5.0
5.1
V
Line regulation
VDD = 12 V to 18 V
0.2
20
mV
Load regulation
1mA to 20mA
3
25
mV
Temperature stability
See Note 2
0.2
0.4
mV/
°C
Total output variation
See Note 2
4.82
5.18
V
Output noise voltage
10 Hz to 10 kHz,
TA = 25°C,
See Note 2
50
µV
Long term stability
1000 hours,
TA = 125°C,
See Note 2
5
25
mV
Output short circuit
–30
–45
–55
mA
Oscillator Section
Initial accuracy
TA = 25°C,
See Note 3
50.5
53
55
kHz
Voltage stability
VDD = 12 V to 18 V
0.2%
1.0%
Temperature stability
TMIN to TMAX,
See Note 2
1%
2.5%
Amplitude
RT/CT Pin peak-to-peak
1.9
V
Discharge current
TA = 25°C,
RT/CT = 2 V,
See Note 4
7.7
8.4
9.0
mA
Discharge current
RT/CT = 2 V,
See Note 4
7.2
8.4
9.5
mA
Error Amplifier Section
Feedback input voltage, initial accuracy
VCOMP = 2.5 V,
TA = 25°C
2.475
2.500
2.525
V
Feedback input voltage, total variation
VCOMP = 2.5 V,
2.45
2.50
2.55
V
Input bias current
VFB = 5.0 V
–0.1
–2.0
µA
Open-loop voltage gain (AVOL)
VOUT = 2 V to 4 V
65
90
dB
Unity gain bandwidth
See Note 2
1.0
1.5
MHz
Power supply rejection ratio (PSRR)
VDD = 12 V to 18 V
60
dB
Output sink current
VFB = 2.7 V,
VCOMP = 1.1 V
2
14
mA
Output source current
VFB = 2.3 V,
VCOMP = 5V
–0.5
–1.0
mA
High-level output voltage (VOH)
VFB = 2.7 V,
RLOAD = 15 k to GND
5
6.8
V
Low-level output voltage (VOL)
VFB = 2.7 V,
RLOAD = 15 k to VREF
0.1
1.1
V
Current Sense Section
Gain
See Note 5, 6
2.85
3.00
3.15
V/V
Maximum input signal
VFB < 2.4 V
0.9
1.0
1.1
V
Power supply rejection ratio (PSRR)
VDD = 12 V to 18 V, See Note 2, 5
70
dB
Input bias current
–0.1
–2.0
µA
CS to output delay
35
70
ns
COMP to CS offset
VCS = 0 V
1.15
V
NOTE: 1. Adjust VDD above the start threshold before setting at 15 V.
NOTE: 2. Ensured by design. Not production tested.
NOTE: 3. Output frequencies of the UCC38C41, UCC38C44 and the UCC38C45 are half the oscillator frequency.
NOTE: 4. Oscillator discharge current is measured with RT = 10 kΩ to VREF.
NOTE: 5. Parameter measured at trip point of latch with VFB = 0 V.
NOTE: 6. Gain is defined as ACS
+
DV
COM
DV
CS
,0V
¬ V
CS ¬
900mV


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