Datasheet

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SLUS542F − OCTOBER 2003 − REVISED JULY 2009
3
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THERMAL RESISTANCE INFORMATION
PACKAGE THERMAL RESISTANCE UNITS
SOIC−16 (D)
θjc 36.9 to 38.4
°C/W
SOIC−16 (D)
θja (0 LFM) 73.1 to 111.6
°C/W
TSSOP−16 (PW)
θjc 33.6 to 35.0
°C/W
TSSOP−16 (PW)
θja (0 LFM) 108.4 to 147.0
°C/W
PIN ASSIGNMENTS
RTDEL
RTON
RTOFF
VREF
SYNC
GND
CS
RSLOPE
LINEOV
LINEUV
VDD
OUT
AUX
PGND
SS/SD
FB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
UCC2892 AND UCC2894
D AND PW PACKAGE
(TOP VIEW)
RTDEL
RTON
RTOFF
VREF
SYNC
GND
CS
RSLOPE
VIN
LINEUV
VDD
OUT
AUX
PGND
SS/SD
FB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
UCC2891 AND UCC2893
D and PW PACKAGEs
(TOP VIEW)
ELECTRICAL CHARACTERISTICS
V
DD
= 12 V
(1)
, 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VREF to GND, R
ON
= R
OFF
= 75 kΩ, R
DEL
= 10 kΩ,
R
SLOPE
= 50 kΩ, −40 °C ≤ T
A
= T
J
≤ 125°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
OVERALL
I
STARTUP
Start-up current V
DD
< V
UVLO
300 500 µA
I
DD
Operating supply current
(1)(2)
V
FB
= 0 V, V
CS
= 0 V,
Outputs not switching
2 3 mA
HIGH-VOLTAGE BIAS SECTION (UCC2891, UCC2893)
I
DD−ST
VDD startup current
Current available from VDD during Start-
up, VIN = 36 V, T
A
= −40°C to 85°C
(3)
4 11 mA
I
VIN
JFET leakage current VIN = 120 V; VDD = 14 V 75 µA
UNDERVOLTAGE LOCKOUT
Start threshold voltage
(1)
12.2 12.7 13.2
Minimum operating voltage after start 7.6 8.0 8.4
V
Hysteresis 4.4 4.7 5.0
V
LINE MONITOR
V
LINEUV
Line UV and Line OV voltage threshold 1.243 1.268 1.293 V
I
LINEHYS
Line UV and Line OV hysteresis current 11.8 12.5 14.5 µA
SOFT-START
I
SS
Charge current R
TON
= 75 kΩ −10.5 −18.5
A
I
SS
Discharge current R
TON
= 75 kΩ 10.5 18.5
µA
V
SS/SD
Discharge/shutdown threshold voltage 0.4 0.5 0.6 V
(1)
Set VDD above the start threshold before setting at 12 V.
(2)
Does not include current of the external oscillator network.
(3)
The power supply starts with I
DD−ST
load on VDD, part will start up with no load up to 125°C. For more detailed information, see pin descriptions
for VIN and VDD.
(4)
I
SSC
and I
SS/SD
are directly proportional to I
RON
. See equation 7.