SM74202 Datasheet, PDF (4/12 Pages) Texas Instruments – 100V Current Mode PWM Controller

SM74202
SNOSBA4A – NOVEMBER 2011 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
Specifications in standard type face are for T_J= +25°C and those in boldface type apply over the full operating junction
temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, and RT = 31.6kΩ. ⁽¹⁾
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CS Sink Impedance (clocked)
35
Ω
Soft Start
Softstart Current Source
7
10
13
µA
Softstart to COMP Offset
0.35
0.55
0.75
V
Oscillator
Frequency1 (RT = 31.6k)
(3)
Frequency2 (RT = 9.76k)
(3)
175
200
560
630
225
kHz
700
kHz
Sync threshold
2.4
3.2
3.8
V
PWM Comparator
Delay to Output
COMP set to 2V,
25
ns
CS stepped 0 to 0.4V,
Time to onset of OUT
transition low
Min Duty Cycle
COMP=0V
0
%
Max Duty Cycle
50
%
COMP to PWM Comparator Gain
0.33
COMP Open Circuit Voltage
4.3
5.2
6.1
V
COMP Short Circuit Current
COMP=0V
0.6
1.1
1.5
mA
Output Section
Output High Saturation
Output Low Saturation
Rise Time
Iout = 50mA, V_CC - V_OUT
I_OUT = 100mA, V_OUT
Cload = 1nF
0.25
0.75
V
0.25
0.75
V
18
ns
Fall Time
Cload = 1nF
15
ns
Thermal Shutdown
Tsd
Thermal Shutdown Temp.
165
°C
Thermal Shutdown Hysteresis
25
°C
(3) Specification applies to the oscillator frequency. The operational frequency of the SM74202 is divided by two.
4
Submit Documentation Feedback
Product Folder Links: SM74202
Copyright © 2011–2013, Texas Instruments Incorporated