Download iSOLATeD DC/DC COnTrOLLerS fOr inTerMeDiATe BuS vOLTAgeS

V I S HAY INTERTE C HNOLO G Y , IN C .
Power ICs
ISOL ATED DC/DC CONTROLLERS FOR
INTERMEDIATE BUS VOLTAGES
in Se mi- Re gulate d a nd
Unre gulate d Half- B r idge Topologie s
p r o d uc t o v e r v i e w
w w w. v i s h a y. c o m
Isolated DC/DC Controllers for Intermediate Bus Voltages
in Semi-Regulated and Unregulated Half-Bridge Topologies
SiP11205 and SiP11206
FEATURES
• 36-V to 75-V input voltage range
• Fixed 50 % duty cycle for DC transformer mode
for SiP11206
• Withstand 100-V, 100-ms transient capability
• Integrated ±1.6 A typical high- and low-side
MOSFET drivers
• Hiccup mode
• Oscillator frequency is programmable from 200 kHz to
1 MHz (100-kHz to 500-kHz switching frequency) and
can be externally synchronized
• Chip UVLO function
• System low input voltage detection
• Voltage feed-forward compensation for SiP11205
• Programmable soft-start function
• Over temperature protection (160 °C)
• High voltage pre-regulator operates during start-up
• Greater than 95.5 % efficiency for 42-V to
55-V input range
• Current sensing on primary low-side switch
• Better than 2 % line regulation at 9 A
PACKAGE AND PIN CONFIGURATION
DH
BST
1
COMP
PGND
AGND
R DB
C OSC
VREF
R OSC
SS
1
2
3
4
96
5
6
94
7
8
98
DL
TOP VIEW
CS
100
LX
Efficiency (%)
V IN
VCC
V INDET
MLP44-16 PowerPAK Package and TSSOP-16 PowerPAK Package
Top View
16
15
14
13
12
11
10
9
92
90
88 to work on the primary side of an isolated halfThe new Vishay Siliconix SiP11205 and SiP11206 controllers are designed
bridge intermediate bus converter (IBC) in telecom and network equipment
and in 1/16 or 1/8 power modules
where
Efficiency @
42 Vin standard
86
Efficiency
@ 48 V
bus voltages such as 48 V need to be converted to 12 V or lower intermediate voltages. The new devices
simplify
designs
in
Efficiency @ 55 Vin
and reduce solution costs by eliminating the need for separate controller84and high-voltage MOSFET driver
components for
secondary synchronous rectification, while their half-bridge architecture further
reduces costs and space requirements by
82
enabling the use of lower-voltage components.
80
0 1Fixed
2 Duty
3 4 Cycle
5 6
SiP11206:
100
100
98
98
96
96
Efficiency (%)
Efficiency (%)
SiP11205: Feed-forward for Semi-Regulated Output
94
92
90
88
Efficiency @ 42 Vin
Efficiency @ 48 Vin
Efficiency @ 55 Vin
86
84
82
8
Io(A)
9
10 11 12 13 14 15
94
92
90
88
Efficiency @ 42 V
Efficiency @ 48 V
Efficiency @ 55 V
86
84
82
80
80
0
100
98
)
7
96
1
2
3
4
5
6
7
8
Io(A)
9
10 11 12 13 14 15
0
1
2
3
4
5
6
7
8
Io(A)
9
10
11
12
13
14
15
The SiP11205 and SiP11206 controllers step down voltages with > 95 % efficiency. They feature an input voltage range of 36 V
to 75 V and comfortably handle 100-V transients for 100 ms in compliance with ETSI 300-132-2. Integrated ±1.6-A high-voltage
MOSFET drivers allow each IC to drive both the low- and high-side switching devices in a half-bridge converter. The oscillator
frequency is programmable from 200 kHz to 1 MHz, the widest such range in the industry, and can be synchronized to an
external sync source. Self-driven synchronous rectification eliminates the requirement for secondary-side MOSFET drivers and
isolated pulse drivers, reducing costs and simplifying designs.
The SiP11205 features input voltage sensing and feed-forward circuitry that keeps the output voltage within a tight range
without the use of optocouplers or voltage feedback circuitry. The SiP11206 differs by allowing the converter to work at
the optimal duty cycle within its full input voltage range in DC transformer mode, which greatly improves system efficiency.
For designs requiring a fully regulated IBC, Vishay offers the Si9122A half-bridge controller with the SiP11203 or SiP11204
secondary synchronous rectifier driver.
SiP11206 Load and Line Regulation
SiP11205 Load and Line Regulation
VIN=42 V VIN=42 VVIN=48 V VIN=48 VVIN=55 V VIN=55 V
14.00
13.00
13.00
13.00
13.00
12.00
12.00
12.00
12.00
11.00
11.00
11.00
11.00
10.00
10.00
10.00
10.00
9.00
9.00
9.00
9.00
8.00
8.00
0
0
3
3
9
9
Load Current
(A)
Load Current
(A)
6
6
12
12
15
15
Output Voltage (V)
14.00
Output Voltage (V)
14.00
14.00
Output Voltage (V)
Output Voltage (V)
VIN=42 VVIN=42 VVIN=48 VVIN=48 VVIN=55 VVIN=55 V
8.00
8.00
0
0
3
3
6
9
9
Load(A)
Current (A)
Load Current
6
12
12
15
15
The SiP11205 and SiP11206 offer a comprehensive range of protection features. The controller supply voltage is linearly
regulated up to its target voltage with an on-chip pre-regulator circuit. Advanced current monitoring and control circuitry allows
the user to set the maximum current in the primary circuit. This feature protects against overcurrent conditions, output short
circuits, and errors when paralleling power supplies. Additional features include low input voltage detection, programmable
soft-start, and overtemperature protection.
Basic Application Circuit
Vin+
Si2303BDS
36 V to 75 V
100 V/100 ms
Vin-
5
6
7
8
BST
V IN
DH
V CC
LX
COMP
CS
AGND
DL
PGND
SS
V REF
R DB
R OSC
COSC
16
15
14
Si7848DP
4
V INDET
13
12
Si7848DP
2
Si7456DP
1
3
11
10
Vo+
Vo-
9
Si2303BDS
Si7456DP
SiP11206
R DB
Start-up Circuit
IBC
Controller
Power
Stage
Isolation
Transformer
Self-driven
Synchronous
Rectifiers
Output Filter
NOTICE Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information
contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay’s terms and
conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular
purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or
selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale.
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