l6611 STMicroelectronics, l6611 Datasheet - Page 6

• Manufacturer Part Number: l6611
• Description: Digitally Programmable Secondary Housekeeping Controller
• Manufacturer: STMicroelectronics

FUNCTION DESCRIPTION (continued)
L6611
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
(*) mounted on board
6/28
Symbol
Symbol
R
T
Latch-mode
th j-amb
Vdd
Bounce or
T
STO
T
Soft-start
J
L
Name
Supply voltage
Voltage on PROG, PS-ON/Clock, DFAULT, VREF, and error
amplifier pins
Voltage on MFAULT, PW-OK, Dmon and positive UV, OV, OC, AC
sense pins.
Voltage on and -12V UV/OV sense pin
Maximum current in ESD clamp diodes
Operating Junction Temperature
Storage Temperature
Lead Temperature (soldering, 10 seconds)
Max. Thermal Resistance junction-to-ambient (*)
The IC provides an on-board 8ms soft-start, a quasi-monotonic ramp from 0V to 2.5V for the A
error amplifier reference voltage, in order to avoid high current peaks in the primary circuit and
output voltage overshoots at start-up. In fact, if this reference gets the nominal value as soon as
the power-up occurs, the A E/A will go out of regulation and tend to sink much more current, thus
forcing PWM to work with the maximum duty-cycle.
This option allows setting either latched-mode or auto restart after 1 second delay in case of
undervoltage faults.
Parameter
Parameter
Description
DIP20
70
-0.5 to Vdd+0.5
-0.5 to +16
-25 to 150
-50 to 150
-0.5 to +7
-16 to +5
Value
300
10
SO20
120
°C/W
Unit
Unit
mA
°C
°C
°C
V
V
V
V