Datasheet

TS2581
PWM Controller
2/7 Version: A11
Electrical Specifications (Ta = 25
o
C unless otherwise noted, V
IN
=12V)
Characteristics Symbol Conditions Min. Typ. Max. Units
Feedback Voltage V
FB
I
OUT
=10mA 0.98 1 1.02 V
Under Voltage Lockout U
VLO
Falling - 6 - V
UVLO Hysteresis - - 0.8 - V
OVP detect voltage V
OVP
Internal define 1.07 1.1 1.13 V
Line Regulation REG
LINE
V
IN
=10 ~ 40V, I
OUT
=10mA - 0.5 1 %
Load Regulation REG
LOAD
I
OUT
=0~3A, R
SENSE
= 33mΩ - 30 50 mV
Quiescent Current I
CCQ
V
FB
= 1.5V, force driver off. - 3 6 mA
Oscillator frequency F
OSC
I
OUT
= 0.5A 70 100 130 KHz
Max. Duty Cycle (ON)
DC
Force driver on V
FB
= 0.6V - 100 - %
Min. Duty Cycle (OFF) Force driver off V
FB
= 1.5V - 0 - %
Sense Voltage VCC-V
SENSE
- 110 - mV
EN/CT pin logic input threshold
voltage
V
EN1
Shutdown mode - - 0.4 V
V
CT
Auto restart, VFB<0.4V 0.5 - 1.5 V
Thermal shutdown Temp T
SD
- 160 - °C
Thermal
Shutdown Hysteresis
T
SH
- 45 - °C
Block Diagram
OSC.
+
+
_
Thermal
Shutdown
CONTROL
+
DRIVER
COMP.
GATE
_
COMP.
Current
limit
+
_
AMP
CURRENT
SOURCE
BIAS
1.23V
REFERENCE
2.5 V
REGULATOR
1.00V
110 mV
+
_
AMP
+
_
AMP
0.4V
SCP
OVP
Line
Compensation
VGATE
VCC
GND
FB
VSENSE
1.10V
START-UP and
Auto restart control
EN/CT
OVP
Pin Function Description
Name Description
EN/CT Shutdown and auto restart control pin
GND GND pin
V
GATE
Driver gate clamping pin. The pin must connect a 1uF capacitor to VIN
V
CC
Operating voltage input
GATE Switch pin. Connect external inductor and diode here
V
SENSE
Voltage Sense input
OVP Over voltage detect pin
FB Feedback pin