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SC1933C 数据表(PDF) 7 Page - Power Integrations, Inc.

部件名 SC1933C
功能描述  Off-Line CV/CC QR Flyback Switcher IC with Integrated Primary Switch, Synchronous Rectification and FluxLink Feedback
PDF  28 Pages
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制造商  POWERINT [Power Integrations, Inc.]
网页  http://www.powerint.com
标志 POWERINT - Power Integrations, Inc.

SC1933C 数据表(HTML) 7 Page - Power Integrations, Inc.

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Rev. C 11/18
7
SC1933C/SC1936C
www.power.com
Figure 9. Cable Drop Compensation Characteristics.
Figure 10. Intelligent Quasi-Resonant Mode Switching.
PI-8035-072516
X × VFB
VFB
Onset of CC
Regulation
No-Load
Cable Drop
Compensation
Load Current
Output Voltage
Request Window
Time
Time
FEEDBACK Pin Short Detection
If the sensed FEEDBACK pin voltage is below V
FB(OFF) at start-up, the
secondary controller will complete the handshake to take control of
the primary and complete t
SS(RAMP) and will stop requesting cycles to
initiate auto-restart (no cycle requests made to primary for longer
than t
AR(SK) second triggers auto-restart).
During normal operation, the secondary will stop requesting pulses
from the primary to initiate an auto-restart cycle when the FEEDBACK
pin voltage falls below the V
FB(OFF) threshold. The deglitch filter on the
protection mode is on for less than ~10 ms. By this mechanism, the
secondary will relinquish control after detecting that the FEEDBACK
pin is shorted to ground.
Cable Drop Compensation (CDC)
The amount of cable drop compensation is a function of the load with
respect to the constant current regulation threshold as illustrated in
Figure 9.
Auto-Restart Thresholds
The OUTPUT VOLTAGE pin includes a comparator to detect when the
output voltage falls below V
FB(AR) or VVOUT(AR), for a duration exceeding
t
FB(AR) or tVOUT(AR)respectively. The secondary controller will relinquish
control when this fault condition is detected. This threshold is meant
to limit the range of constant current (CC) operation and is included
to support high power charger applications.
SECONDARY BYPASS Pin Overvoltage Protection
The SC1933C/SC1936C secondary controller features a SECONDARY
BYPASS pin OV feature similar to the PRIMARY BYPASS pin OV feature.
When the secondary is in control, in the event that the SECONDARY
BYPASS pin current exceeds I
BPS(SD) (~7 mA) the secondary will send a
command to the primary to initiate an auto-restart off-time (t
AR(OFF)) or
latch-off (see Secondary Fault Response in Feature Code Addendum).



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