Datasheet

t
DELAY
= t
f(OUTA)
- t
f(OUTC)
t
PERIOD
OUTA
OUTC
t
DELAY
= t
R(OUTB)
- t
f(OUTA)
OUTA
OUTB
( ) ( ) ( ) ( )
f OUTC f OUTA f OUTC f OUTB
PERIOD PERIOD
t t t t
180 or 180
t t
- -
F = ´ F = ´
UCC1895, UCC2895, UCC3895
www.ti.com SLUS157P –DECEMBER 1999–REVISED JUNE 2013
ELECTRICAL CHARACTERISTICS (continued)
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 and no load on the
outputs, T
A
= T
J
. T
A
= 0°C to 70°C for UCC3895x, T
A
= –40°C to +85°C for UCC2895x and T
A
= –55°C to +125°C for the
UCC1895x. (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OUTPUT
V
OH
High--level output voltage (all I
OUT
= –10 mA, VDD to output 250 400 mV
outputs)
V
OL
Low-level output voltage (all outputs) I
OUT
= 10 mA 150 250 mV
t
R
Rise time
(4)
C
LOAD
= 100 pF 20 35 ns
t
F
Fall time
(4)
C
LOAD
= 100 pF 20 35 ns
PWM COMPARATOR
EAOUT to RAMP input offset voltage RAMP = 0 V 0.72 0.85 1.05 V
DELAB = DELCD = REF
Minimum phase shift
(5)
RAMP = 0 V 0.0% 0.85% 1.4%
(OUTA to OUTC, OUTB to OUTD) EAOUT = 650 mV
t
DELAY
Delay
(6)
0 V < RAMP < 2.5 V, EAOUT = 1.2 V 70 120 ns
(RAMP to OUTC, RAMP to OUTD) DELAB = DELCD = REF
I
R(bias)
RAMP bias current RAMP < 5 V, CT = 2.2 V –5 5 µA
I
R(sink)
RAMP sink current RAMP = 5 V, CT = 2.6 V 12 19 mA
(4) Ensured by design. Not production tested.
(5) Minimum phase shift is defined as:
where
(a) t
f(OUTA)
= falling edge of OUTA signal
(b) t
f(OUTB)
= falling edge of OUTB signal
(c) t
f(OUTC)
= falling edge of OUTC signal,
(d) t
f(OUTD)
= falling edge of OUTD signal
(e) t
PERIOD
= period of OUTA or OUTB signal
(6) Output delay is measured between OUTA and OUTB, or OUTC and OUTD. Output delay is defined as shown below where: t
f(OUTA)
=
falling edge of OUTA signal, t
r(OUTB)
= rising edge of OUTB signal (see Figure 1 and Figure 2).
Figure 2. Same Applies to OUTC and OUTD
Figure 1. Same Applies to OUTB and OUTD
Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: UCC1895 UCC2895 UCC3895