UCC29900_15 Datasheet, PDF (1/24 Pages) Texas Instruments – Integral Cycle Controller

UCC29900
www.ti.com
Integral Cycle Controller
Check for Samples: UCC29900
SLUS923B – APRIL 2009 – REVISED JUNE 2010
FEATURES
1
• Integral Cycle Control for High Efficiency
Burst Mode Operation at all Load Levels
• Allows Easy Use of Low Cost Self-Driven
Secondary-Side Synchronous Rectifiers (SRs)
• Advanced Drive Signal Timing Control for
Volt-Sec Balance
• Light-Load Mode for Reduced Power
Consumption at No Load and Light Load
• Integrated Soft-Start Function
• Frequency Dithering for Improved EMI
Reduction
• Bus Voltage UVLO and OVP Sensing
• Current Sense Input for Overcurrent
Protection
• SCP Input Pin to Flag Short-Circuit Condition
• Selectable Latching or Hiccup Mode OCP/SCP
• START Output – Ease Startup Bias Design,
(allow improved PFC stage startup transient)
• FAULT Output to Indicate Latched Fault State
APPLICATIONS
• High Efficiency AC-DC Converters
• Low Profile & High Density AC-DC Adapters
DESCRIPTION
The UCC29900 is a new class of Integral Cycle
Control (ICC) controller designed to implement
ultra-high efficiency isolated switching power stages.
ICC can be employed to achieve ultra-high
conversion efficiency over a wide range of load
current. The hysteretic mode output voltage control
employed exhibits fast transient response, with
almost zero output overshoot. Isolation stage
efficiencies of >96% have been demonstrated in
reference designs.
ICC controllers operate the switching power stage in
high efficiency burst mode at all load levels, rather
than the more conventional PWM mode.
The UCC29900 is a highly integrated ICC controller,
incorporating all the features necessary to implement
a wide range of high efficiency designs. The
UCC29900 has been designed for ease of use, and
incorporates many useful features, including
over-current and short-circuit protection, bus under- &
over-voltage detection, soft-start and light load
management.
SIMPLIFIED APPLICATION DIAGRAM
V
+ ^BUS
3.3 V
5
1
9
CLAMP VDD OC
2 FB
MODE
11
NC
HG 7
8 VIN UCC29900
LG 4
6 SCP
START VDD
12 10
CS 3
VSS FAULT
14 13
M1
M2
T1
VOUT
C
OUT
+
1
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