Datasheet

UCC2895-Q1
www.ti.com SLUS783C –MAY 2008–REVISED AUGUST 2012
RECOMMENDED OPERATING CONDITIONS
(1)
(continued)
MIN NOM MAX UNIT
R
DEL_AB
Delay resistor 2.5 40 kΩ
R
DEL_CD
T
J
Operating junction temperature
(4)
–55 125 °C
(4) It is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time.
ELECTRICAL CHARACTERISTICS
V
DD
= 12 V, R
T
= 82 kΩ, C
T
= 220 pF, R
DELAB
= 10 kΩ, R
DELCD
= 10 kΩ, C
REF
= 0.1 μF, C
VDD
= 0.1 μF, no load on the outputs,
T
A
= T
J
= –40°C to 125°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Undervoltage Lockout (UVLO)
UVLO
(on)
Start-up voltage threshold 10.2 11 11.8 V
Minimum operating voltage after start-
UVLO
(off)
8.2 9 9.8 V
up
UVLO
(hys)
Hysteresis 1 2 3 V
Supply
I
START
Start-up current V
DD
= 8 V 150 250 μA
I
DD
Operating current 5 6 mA
V
DD_CLAMP
VDD clamp voltage I
DD
= 10 mA 16.5 17.5 18.5 V
Voltage Reference
T
J
= 25°C 4.94 5 5.06
V
REF
Output voltage V
10 V < V
DD
< V
DD_CLAMP
,
4.85 5 5.15
0 mA < I
REF
< 5 mA, T
J
= –40°C to 125°C
I
SC
Short-circuit current REF = 0 V, T
J
= 25°C 10 20 mA
Error Amplifier
Common-mode input voltage –0.1 3.6 V
V
IO
Offset voltage –7 7 mV
I
BIAS
Input bias current (EAP, EAN) –1 1 μA
V
OH_EAOUT
High-level output voltage EAP – EAN = 500 mV, I
EAOUT
= –0.5 mA 4 4.5 5 V
V
OL_EAOUT
Low-level output voltage EAP – EAN = –500 mV, I
EAOUT
= 0.5 mA 0 0.2 0.4 V
I
SOURCE
Error amplifier output source current EAP – EAN = 500 mV, EAOUT = 2.5 V 1 1.5 mA
I
SINK
Error amplifier output sink current EAP – EAN = –500 mV, EAOUT = 2.5 V 2.5 4.5 mA
A
VOL
Open-loop dc gain 75 85 dB
GBW Unity gain bandwidth
(1)
5 7 MHz
1 V < EAN < 0 V, EAP = 500 mV,
Slew rate
(1)
1.5 2.2 V/μs
0.5 V < EAOUT < 3 V
No-load comparator turn-off threshold 0.45 0.5 0.55 V
No-load comparator turn-on threshold 0.55 0.6 0.69 V
No-load comparator hysteresis 0.035 0.1 0.165 V
Oscillator
f
OSC
Frequency T
J
= 25°C 473 500 527 kHz
Frequency total variation
(1)
Over line and temperature 2.5% 5%
V
IH_SYNC
High-level input voltage, SYNC 2.05 2.1 2.4 V
V
OH_SYNC
High-level input voltage, SYNC I
SYNC
= –400 μA, V
CT
= 2.6 V 4.1 4.5 5 V
V
OL_SYNC
Low-level output voltage, SYNC I
SYNC
= 100 μA, V
CT
= 2.6 V 0 0.5 1 V
SYNC output pulse width LOAD
SYNC
= 3.9 kΩ and 30 pF in parallel 85 135 ns
V
RT
Timing resistor voltage 2.9 3 3.1 V
V
CT(peak)
Timing capacitor peak voltage 2.25 2.35 2.55 V
V
CT(valley)
Timing capacitor valley voltage 0 0.2 0.4 V
(1) Specified by design
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