Full-Bridge Controller. LTC1922-1 Datasheet

LTC1922-1 Controller. Datasheet pdf. Equivalent

Part LTC1922-1
Description Synchronous Phase ModEGZ12DCFulated Full-Bridge Controller
Feature U U LTC1922-1 Synchronous Phase Modulated Full-Bridge Controller FEATURES DESCRIPTIO s Adaptive.
Manufacture Linear
Datasheet
Download LTC1922-1 Datasheet



LTC1922-1
LTC1922-1
Synchronous Phase
Modulated Full-Bridge Controller
FEATURES
DESCRIPTIO
s Adaptive DirectSenseTM Zero Voltage Switching
s Integrated Synchronous Rectification Control for
Highest Efficiency
s Output Power Levels from 50W to Kilowatts
s Very Low Start-Up and Quiescent Currents
s Compatible with Voltage Mode and Current Mode
Topologies
s Programmable Slope Compensation
s Undervoltage Lockout Circuitry with 4.2V Hysteresis
and Integrated 10.3V Shunt Regulator
s Fixed Frequency Operation to 1MHz
s 50mA Outputs for Bridge Drive and Secondary Side
Synchronous Rectifiers
s Soft-Start, Cycle-by-Cycle Current Limiting and
Hiccup Mode Short-Circuit Protection
s 5V, 15mA Low Dropout Regulator
s 20-Pin PDIP and SSOP Packages
U
APPLICATIO S
s Telecommunications, Infrastructure Power Systems
s Distributed Power Architectures
s Server Power Supplies
s High Density Power Modules
The LTC®1922-1 phase shift PWM controller provides all
of the control and protection functions necessary to imple-
ment a high performance, zero voltage switched, phase
shift, full-bridge power converter with synchronous recti-
fication. The part is ideal for developing isolated, low
voltage, high current outputs from a high voltage input
source. The LTC1922-1 combines the benefits of the full-
bridge topology with fixed frequency, zero voltage switch-
ing operation (ZVS). Adaptive ZVS circuity controls the
turn-on signals for each MOSFET independent of internal
and external component tolerances for optimal perfor-
mance.
The LTC1922-1 also provides secondary side synchro-
nous rectifier control. The device uses peak current mode
control with programmable slope comp and leading edge
blanking.
The LTC1922-1 features extremely low operating and
start-up currents to simplify off-line start-up and bias
circuitry. The LTC1922-1 also includes a full range of
protection features and is available in 20-pin through hole
(N) and surface mount (G) packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
DirectSense is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
BIAS
SUPPLY
VIN
48V
LTC1922-1
VOUT
3.3V
ISOLATED
FEEDBACK
Efficiency
100
90
VIN = 48V
80
VIN = 36V
70
60
0
10 20 30
LOAD CURRENT (A)
40
1922 • TA01b
1922 TA01a
1



LTC1922-1
LTC1922-1
ABSOLUTE AXI U RATI GS
(Note 1)
VCC to GND
Low Impedance Source ......................... –0.3V to 10V
(Chip Self Regulates at 10.3V)
All Other Pins to GND
(Low Impedance Source) ..................... –0.3V to 5.5V
VCC (Current Fed) .................................................. 25mA
VREF Output Current ................................ Self Regulated
Outputs (A, B, C, D, E, F) Current ..................... ±100mA
Operating Temperature Range (Note 5)
LTC1922E ........................................... – 40°C to 85°C
LTC1922I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SYNC 1
RAMP 2
CS 3
COMP 4
RLEB 5
FB 6
SS 7
PDLY 8
SBUS 9
ADLY 10
20 CT
19 GND
18 OUTA
17 OUTB
16 OUTC
15 VCC
14 OUTD
13 OUTE
12 OUTF
11 VREF
ORDER PART
NUMBER
LTC1922EG-1
LTC1922IG-1
LTC1922EN-1
LTC1922IN-1
G PACKAGE
N PACKAGE
20-LEAD PLASTIC SSOP 20-LEAD PDIP
TJMAX = 125°C, θJA = 110°C/W (G)
TJMAX = 125°C,θJA = 62°C/W (N)
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at VCC = 9.5V, CT = 180pF, TA = TMIN to TMAX unless other wise noted.
SYMBOL
Input Supply
UVLO
UVHY
ICCST
ICCRN
VSHUNT
RSHUNT
Delay Blocks
DTHR
DHYS
DTMO
PARAMETER
Undervoltage Lockout
UVLO Hysteresis
Start-Up Current
Operating Current
Shunt Regulator Voltage
Shunt Resistance
Delay Pin Threshold
ADLY and PDLY
Delay Hysteresis Current
ADLY and PDLY
Delay Time-Out
DZRT
Phase Modulator
ROS
IRMP
ISLP
Zero Delay Threshold
RAMP Offset Voltage
RAMP Discharge Current
Slope Compensation Current
DCMX
DCMN
Maximum Phase Shift
Minimum Phase Shift
CONDITIONS
Measured on VCC
Measured on VCC
VCC = VUVLO – 0.3V
Current Into VCC = 10mA
Current Into VCC = 7mA to 17mA
SBUS = 1.5V
SBUS = 2.25V
SBUS = 1.5V, ADLY/PDLY = 1.6V
SBUS = 1.5V
SBUS = 2.25V
Measured on SBUS
Measured on COMP, RAMP = 0V
RAMP = 1V, COMP = 0V
Measured on CS, CT = 1.5V
CT = 3V
COMP = 4V
COMP = 0V
MIN TYP MAX UNITS
3.8
q
10.25
4.2
145
4
10.2
–1.5
10.7
250
7
10.8
2
V
V
µA
mA
V
1.38 1.50 1.62
2.08 2.25 2.42
1.1 1.3 1.45
600
900
3 4.15 5
V
V
mA
ns
ns
V
30
35
70
q 95
q
0.4
50
55 75
110 150
99.5
0.1 0.6
V
mA
µA
µA
%
%
2





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