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SI9122 Datasheet(Fiches technique) 2 Page - Vishay Siliconix

Numéro de pièce SI9122
Description  500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Drivers
Télécharger  17 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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Si9122
Vishay Siliconix
www.vishay.com
2
Document Number: 71815
S-41944—Rev. F, 18-Oct-04
TECHNICAL DESCRIPTION
Si9122 is a voltage mode controller for the half-bridge
topology. With 100-V depletion mode MOSFET capability, the
Si9122 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, Si9122 provides peak efficiency
throughout the entire line and load range. In order to simplify
the traditional secondary synchronous rectification, Si9122
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 a source rating of the MOSFETs. Si9122 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.
Si9122 is packaged in TSSOP-20 and MLP65-20 packages.
In TSSOP-20 packaging, both standard and lead (Pb)-free
options are available. The MLP65-20 package is
lead (Pb)-free.
In order to satisfy the stringent ambient
temperature requirements, Si9122 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 a sense resistor on the primary low-side switch.
DETAILED BLOCK DIAGRAM
VREF
+
Pre-Regulator
+
+
REG_COMP
VINDET
VREF
VIN
+
Error Amplifier
132 kW
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.
VREF
2
60 kW
ISS
8.8 V
550 mV
20 mA
8 V
9.1 V
VCC
VCC
VCC




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