Part Number |
BF2520 |
Manufacturers |
ETC |
Logo |
|
Description |
Precision constant voltage / constant current power supply primary side controller |
Datasheet |
BF2520 Datasheet (PDF) |
AC/DC TL431
PFM
SOT23-6
PSR CS
Rs VDD
1 CC/CV
AC AC
CV CC
5% TL431
1uA VDD OVP
LEB UVLO
1
AC/DC PC TV
/ RCC LED
SOT23 6
SOT23 6
2
VDD VC BASE CS FB
/ /
Tj 10
I/O 1 GND P 2 CS I 3 BASE O 4 FB I
5 VC I 6 VDD P
-0.3 -0.3 -0.3 -0.3 -0.3 -40 -55 260
30V 7V 7V 7V 7V 150 150
BJT
3
TA=25 VDD=15V
VDD
IDD ST IDD OP UVLO
ON
VDD
UVLO OFF VDD
VDD_MAX
VDD
VDD_OVP
TLEB Vth_ocp Td_oc FB Vref_fb
LEB OCP
Tpause_min Tpause_max I_comp_cable
VDD=11V VDD=15V VDD VDD IDD=10mA
6.0 11.5
25
1 600
12.8
27
3 700 7.6 13.5 25 29
uA uA V V V V
500 ns 480 500 515 mV
100 ns
1.97 2
2.03 V
2 US 8 10 12 MS 42 48 uA
Is_max Is_preoff Rdson_l
Pre-off
20 0.5
1
40 mA 1.5 mA
ohm
TL431
PSR
CC/CV , LED
VDD UVLO
AC/DC
600uA /
/1
4
CC/CV 1 DCM
Is=(Np/Ns) Ip
Vaux=(Naux/Ns) (Vo+ V) V
1 2
DCM
FB 4 Vref
2 Vref(2V)
RS CC
CS
RS 3
5
3 RS
Po max=(1/2)LpFswIp2 Lp Ip
3
Fsw=1/(2Tdemag) Tdemag
4 Ip fsw
DCM 3
FB
V/Vout=(Icomp_cableX(R1//R2)X10e-6/2)X100%
V-
R1//R2=3K
6.75%
BJT .