TS19372_10 Datasheet, PDF (2/9 Pages) Taiwan Semiconductor Company, Ltd – Buck (Step-down) WLED Driver with External Switch

TS19372
Buck (Step-down) WLED Driver with External Switch
Absolute Maximum Rating
Parameter
Symbol
Limit
Unit
Input Voltage
Supply Voltage (Recommended)
FB Voltage
SW Voltage
Power Dissipation
Ambient Temperature Range
Junction Temperature Range
V_IN
40
V
V_IN
6 ~ 40
V
V_FB
-0.3 ~ 40
V
V_SW
36
V
P_D
450
mW
T_A
-40 to +85
o_C
T_J
+150
o_C
Electrical Specifications (Ta = 25^oC, unless otherwise noted)
Parameter
Symbol
Test Conditions
Min Typ Max Units
Input Voltage Range
V_IN
6
--
40
V
Line Regulation
REG_LINE
--
1.4
5
mV
Charge Current
I_CHARGE
V_IN =6V~40V
--
30
45
uA
Discharge Current
I_DISCHARGE V_IN =6V~40V
180
230
290
uA
Switching Frequency
F_OSC
C_T = 100pF,
--
180
--
kHz
Current Limit Sense Voltage
V_SENSE
I_DISCHARGE = I_CHARGE
250
--
350
mV
Switch V_CESAT
V_SAT
I_SW =300mA
--
1.0
1.3
V
Supply Current
I_CC
V_IN =6V~40V, C_T =1nF
--
3
4
mA
Collector off-state Current
I_C(OFF)
V_CE =40V
1
100
uA
Note: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
temperature as possible
Pin Description
Pin
Function
1
SW
2
Ground
3
Timing Capacitor
4
I_SENSE
5
VIN
Description
Driver Switching Pin
Ground Pin.
Timing capacitor oscillator input
Peak current sense input to monitor the voltage drop across an external
resistor to limit the peak current through the circuit
Input Voltage Supply pin
2/9
Version: D09