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UCC256301 Datasheet(PDF) 4 Page - Texas Instruments

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Part # UCC256301
Description  Hybrid Hysteretic Mode Wide VIN LLC Resonant Controller Enabling Ultra-Low Standby Power
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC256301 Datasheet(HTML) 4 Page - Texas Instruments

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4
6
5
3
1
10
11
14
15
16
HV
LO
GND
LL/SS
HO
VCC
VCR
FB
BLK
7
UCC256301
LLC
Controller
HB
HS
12
RVCC
9
BW
ISNS
8
4
UCC256301
SLUSCU6B – AUGUST 2017 – REVISED AUGUST 2017
www.ti.com
Product Folder Links: UCC256301
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Copyright © 2017, Texas Instruments Incorporated
5 Pin Configuration and Functions
DDB Package
16-Pin SOIC
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
NO.
BLK
4
I
This pin is used to sense the PFC output voltage level. A resistive divider should be used to
attenuate the signal before it is applied to this pin. The voltage level on this pin will determine
when the LLC converter start/stops switching. The sensed BLK voltage is also used to adjust
the burst mode threshold to improve efficiency over the input voltage range.
BW
8
I
This pin is used to sense the output voltage through the bias winding. The sensed voltage is
used for output over voltage protection.
FB
5
I
LLC stage control feedback input. The amount of current sourced from this pin will determine
the LLC input power level.
GND
11
G
Ground reference for all signals.
HB
14
I
High-side gate-drive floating supply voltage. The bootstrap capacitor is connected between
this pin and pin HS. A high voltage, high speed diode should be connected from RVCC to
this pin to supply power to the upper MOSFET driver during the period when the lower
MOSFET is conducting.
HO
15
O
High-side floating gate-drive output.
HS
16
I
High-side gate-drive floating ground. Current return for the high-side gate-drive current.
HV
1
I
Connects to Internal HV startup JFET. This pin provides start up power for both PFC and
LLC stage. This pin also monitors the AC line voltage for x-capacitor discharge function.
ISNS
6
I
Resonant current sense. The resonant capacitor voltage is differentiated with a first order
filter to measure the resonant current
LL/SS
9
I
The capacitance value connected from this pin to ground will define the duration of the soft-
start period. This pin is also used to program the burst mode threshold; the resistor divider
on this pin programs the burst mode threshold and the threshold scaling factor with BLK pin
voltage.
LO
10
O
Low-side gate-drive output.
Missing
2
N/A
Functional creepage and clearance
Missing
13
N/A
Functional creepage and clearance
RVCC
12
P
Regulated 12-V supply. This pin is used to supply the gate driver and PFC controller.
VCC
3
P
Supply input.
VCR
7
I
Resonant capacitor voltage sense


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