IC CTRLR PWM GREEN CM OVP 8SOIC

 

UCC28600DRG4

Manufacturer Part NumberUCC28600DRG4
DescriptionIC CTRLR PWM GREEN CM OVP 8SOIC
ManufacturerTexas Instruments
UCC28600DRG4 datasheets

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Specifications of UCC28600DRG4

Output IsolationIsolatedFrequency Range40 ~ 130kHz
Voltage - Input8 ~ 32 VPower (watts)650mW
Operating Temperature-40°C ~ 105°CPackage / Case8-SOIC (0.154", 3.90mm Width)
Number Of Outputs1Duty Cycle (max)99 %
Output Current1.2 AMounting StyleSMD/SMT
Switching Frequency130 KHzMaximum Operating Temperature+ 105 C
Fall Time10 nsMinimum Operating Temperature- 40 C
Rise Time50 nsSynchronous PinNo
TopologyFlybackFor Use WithUCC28600EVM-65W - UCC28600EVM-65W296-23117 - EVAL MODULE 120W FOR UCC28600
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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UCC28600
SLUS646I – NOVEMBER 2005 – REVISED JANUARY 2010
UCC28600
UVLO
REF_OK
Thermal
Shutdown
OVR_T
LINE_OVP
REF
(QR Detect)
(5 V)
LOAD_OVP
(QR Detect)
Over−Current
Shutdown
20 k
FB
1.25 V
7
FB
SS_OVR
CS
Quasi-Resonant / DCM Control
Quasi-resonant (QR) and DCM operation occur for feedback voltages V
peak CS voltage is commanded to be between 0.4 V and 0.8 V. During this control mode, the rising edge of OUT
always occurs at the valley of the resonant ring after demagnetization. Resonant valley switching is an integral
part of QR operation. Resonant valley switching is also imposed if the system operates at the maximum
switching frequency clamp. In other words, the frequency varies in DCM operation in order to have the switching
event occur on the first resonant valley that occurs after a 7.7-ms (130-kHz) interval. Notice that the CS pin has
an internal dependent current source, 1/2 I
function that is discussed in the Protection Features section.
Frequency Foldback Mode Control
Frequency foldback mode uses elements of the FAULT LOGIC, shown in
shown in
Figure
6. At the minimum operating frequency, the internal oscillator sawtooth waveform has a peak of
4.0 V and a valley of 0.1 V. When the FB voltage is between 2.0 V and 1.4 V, the FB_CL signal in
commands the oscillator in a voltage controlled oscillator (VCO) mode by clamping the peak oscillator voltage.
The additional clamps in the OSCILLATOR restrict VCO operation between 40 kHz and 130 kHz. The FB_CL
voltage is reflected to the modulator comparator effectively clamping the reflected CS command to 0.4 V.
Green-Mode Control
Green mode uses element of the fault logic, shown in
The OSC_CL signal clamps the Green-mode operating frequency at 40 kHz. Thus, when the FB voltage is
between 1.4 V and 0.5 V, the controller is commanding an excess of energy to be transferred to the load which
in turn, drives the error higher and FB lower. When FB reaches 0.5 V, OUT pulses are terminated and do not
resume until FB reaches 0.7 V. In this mode, the converter operates in hysteretic control with the OUT pulse
terminated at a fixed CS voltage level of 0.4 V. The power limit offset is turned OFF during Green mode and it
returns to ON when FB is above 1.4 V, as depicted in
frequency in order to minimize switching losses and increase the efficiency at light load conditions.
16
Submit Documentation Feedback
REF
SET
D
Q
Q
CLR
+
0.5 V/0.7 V
Burst
+
Power−Up Reset
+
0.5 V/1.4 V
Figure 8. Fault Logic Details
. This current source is part of the cycle-by-cycle power limit
LINE
Figure 8
and the mode clamps circuit, shown in
Figure
8. Green mode reduces the average switching
Product Folder Link(s):
UCC28600
www.ti.com
Fault Logic
RUN
SS/DIS
S
Q
BURST
R
Q
8
STATUS
3
CS
between 2.0 V and 4.0 V. In turn, the
FB
Figure 8
and the mode clamp circuit,
Figure 6
Figure
Copyright © 2005–2010, Texas Instruments Incorporated
6.

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