R2A20124AFP/R2A20124ASP
Preliminary
Electrical Characteristics (cont.)
(Ta = 25°C, Vcc = 12 V, RT = 180 k, Rdelay = 51 k, Rramp-slp = 27 k, unless otherwise specified.)
Item
Symbol
Min
Typ
Max Unit
Test Conditions
OVER CURRENT PROTECTION: R2A20124AFP/ASP
Pulse-by-pulse current limit
threshold
Delay to OUT pins *1
VCS-PP
Tpd-cs
1.26
1.4
1.54
V
SEC-CONT = 0.3 V (AFP)
—
100
200
ns CS = 0 V to 1.57 V,
SEC-CONT = 0.3 V (AFP)
CS sink current
OUTPUT: R2A20124AFP/ASP
ISINK-CS
2
5
—
mA CS = 0.15 V, COMP = 0 V
High voltage
Low voltage
Rise time
VOH-OUT
VOL-OUT
tr
11.5 11.9
—
—
0.05
0.2
—
30
100
V IOUT = –2 mA
V IOUT = 2 mA
ns COUT = 100 pF
Fall time
tf
—
Timing offset *2
TD4
—
POWER INFORMATION AMPLIFIER: R2A20124AFP
30
100
ns COUT = 100 pF
20
140
ns
Tranceconductance
gm
15
20
25
s CS = 0.4 V
SECONDARY CONTROL: R2A20124AFP
Forced synchronous rectification Von-sec-cont 4.6
—
—
V
CS = 1 V
on voltage
Forced synchronous rectification Voff-sec-cont —
off voltage
—
0.4
V
CS = 0 V
Input bias current-1
Input bias current-2
Current hysteresis
Notes: 1. Tpd-cs is defined as;
1.57 V
CS
0
ISEC-CONT1
ISEC-CONT2
dISEC-CONT
50%
5
10
20
A CS = 0 V, SEC-CONT = 2.1 V
10
20
40
A CS = 1 V, SEC-CONT = 2.1 V
5
10
20
A
OUT-C/D
50%
2. TD4 is defined as;
OUT-D
50%
Tpd-cs
OUT-C
50%
OUT-E
50%
TD4
OUT-F
50%
TD4
R03DS0031EJ0300 Rev.3.00
Mar 11, 2011
Page 10 of 12