Datasheet

TS2581
PWM Controller
3/7 Version: A11
Function Description
Feedback
Sense the regulated output voltage to complete the feedback loop, when VFB <0.4V, the SCP is happened.
VSENSE
The current limit sense pin, if V
IN
-V
SENSE
≧ 110mV, the over current is happened that it can turn-off driver cycle by
cycle.
OVP
The Over Voltage sense pin, If VOVP >1.10V, the OVP is happened that it can turn-off the driver. You can set
VOUT OVP voltage by outside resistances (R3 and R4), Please see below formula to set.
)
5R
2
R
+1(×10.1=VOUT
)OVP(
The Over Voltage Protect, If VOVP >1.10V, the OVP is happened that it can turn-off the driver.
Under Voltage Lockout (UVLO)
To avoid error-operation of the device at low input voltages an under voltage lockout is included that disables the
device, if the input voltage falls below 6.0V
Thermal Consderation
The SOP-8L package needs a heat sink under most conditions. The heat sink connect exposed pad of TS2581 to
obtain best effect. The size of the heat sink depends on the input voltage, output voltage, output current and
ambient temperature.
Typical Application Circuit
VCC 10~36V 5V/3A
U2
AX3304/A
1
2
3
4 5
6
7
8
EN/CT
GND
VGATE
VCC GATE
VSENSE
OVP
FB
D S
U1
P-MOS
4
51
6
7
8
2
3
C3
1uF
D1
B340A
C5
Option
L1 66uH / 33uH
C7
0.1u
C6
Option
R4
Option
R5
3K
R2
12K
R1 0R
RSENSE1 33mR
R6
3K
R3
12K
C4
470uF
C2
0.1u
C1
470uF
ICL = ( VCC - Vsense ) / Rsense
TS2581