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SI9122A Datasheet(Fiches technique) 2 Page - Vishay Siliconix

Numéro de pièce SI9122A
Description  500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers
Télécharger  15 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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Si9122A
Vishay Siliconix
www.vishay.com
2
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
TECHNICAL DESCRIPTION
Si9122A is a voltage mode controller for the half-bridge
topology. With 100-V depletion mode MOSFET capability, the
Si9122A is capable of powering directly from the high voltage
bus to VCC through an external PNP pass transistor, or may be
powered through an external regulator directly through the
VCC pin. With PWM control, Si9122A provides peak efficiency
throughout the entire line and load range. In order to simplify
the design of efficient secondary synchronous rectification
circuitry, Si9122A provides intelligent gate drive signals to
control the secondary MOSFETs. With independent gate drive
signals from the controller, transformer design is no longer
limited by the gate to source rating of the secondary–side
MOSFETs.
Si9122A
provides
constant
VGS voltage,
independent of line voltage to minimize the gate charge loss
as well as conduction loss. A break-before-make function is
included to prevent shoot through current or transformer
shorting. Adjustable Break-Before-Make time is incorporated
into the IC and is programmable by an external resistor value.
Si9122A is packaged in lead (Pb)–free TSSOP-20 and
MLP65-20 packages. To satisfy stringent ambient tempe–
rature requirements, Si9122A is rated to handle the industrial
temperature range of –40 to 85
_C. When a situation arises
which results in a rapid increase in primary (or secondary
current) such as output shorted or start-up with a large output
capacitor, control of the PWM generator is handed over to the
the current loop. Monitoring of the load current is by means of
an external current sense resistor in the source of the primary
low-side switch.
SI9122 BLOCK DIAGRAM
VREF
+
Pre-Regulator
+
+
REG_COMP
VINDET
VREF
VIN
+
Error Amplifier
132 k
W
EP
+
PWM
Comparator
SS
+
CS2
CS1
Over Current Protection
GND
VUVLO
VUV
VSD
VCC
Duty Cycle
Control
CL_CONT
Driver
Control
and
Timing
BBM
OTP
OSC
ROSC
VFF
Ramp
SRL
SRH
PGND
DL
DH
SYNC
Driver Low
SYNC
Driver High
Low-Side
Driver
High-Side
Primary
Driver
Int
BST
LX
Si9122
Peak DET
Figure 2.
V
REF
2
60 k
W
ISS
8.8 V
550 mV
20
mA
8 V
9.1 V
VCC
VCC
VCC




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