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Si8284 датащи(PDF) 10 Page - Silicon Laboratories

номер детали Si8284
подробное описание детали  4.0 Amp ISODrivers with Integrated DC-DC Converters
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
Logo SILABS - Silicon Laboratories

Si8284 датащи(HTML) 10 Page - Silicon Laboratories

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The high supply voltage configuration is used when a higher voltage power supply rail (up to 24 V) is available. All product options of
the Si8282 and Si8284 are intended for this configuration. The dc-dc converter uses the isolated flyback topology. With this topology,
the switch and sense resistor are external, allowing higher switching voltages.
The output voltage is sensed on the secondary side without requiring additional optocouplers and support circuitry to bias those opto-
couplers. This allows the dc-dc to operate with superior line and load regulation.
The figure below shows the block diagram of an Si828x with external components. The Si8284 product option has externally controlled
switching frequency and soft start. The dc-dc requires input capacitor C28, transformer T1, switch Q4, sense resistor Rsense, rectifying
diodes D1 and D2, and output capacitors C26 and C27. To supply VDDA, Q3 transistor is biased by R23, 5.6 V Zener diode D5 and
filtered by C30 and C11. External frequency and soft start behavior is set by CSS and RFSW. Resistors R1 and R2 divide the output
voltage to match the internal reference of the error amplifier. The ratio of the two secondary windings splits the output voltage into two
portions. The positive VDDB and the negative VSSB with common reference to VMID (IGBT Emitter).
VDDB = VOUT ×
( S1
S1 + S2 )
VSSB = − VOUT ×
( S2
S1 + S2 )
Type 1 loop compensation made by RCOMP and CCOMP are required at the COMP pin. The combination of RCOMP = 49.9 kΩ and
CCOMP = 1.5 nF satisfies most Si8282 and Si8284 dc-dc applications. Though it is not necessary for normal operation, we recommend
to use RC snubbers (not shown) on both primary and secondary windings to minimize high-frequency emissions.
RDY
/FLT
VH
VL
Si8282/Si8284
Error Amp
and
Compensation
Encoder
UVLO
VDDB
VSNS
COMP
VSSB
R1
VSSB
Vin
T1
D1
C26
HF RX
HF TX
R2
C28
RCOMP
CCOMP
DSAT
Detection
HF RX
Driver
Miller
Clamp
CLMP
DSAT
VMID
HF TX
Decoder
Encoder
Decoder
/RST
+IN
-IN
Input
Control &
Reset
D2
C27
Freq. Control
and Shutdown
Soft Start
DC-DC Controller
Current
Sensing
UVLO
FET
Driver
ESW
VDDA
RSN
GNDP
Rsense
R23
Q4
Q3
FC_SH
SS
CSS
RFSW
5.6V
C11
C30
D5
Figure 2.6. Si8282/84 Block Diagram: >5.5 V Input to Split Voltage Output
Si8281/82/83/84 Data Sheet
System Overview
silabs.com | Smart. Connected. Energy-friendly.
Preliminary Rev. 0.5 | 9


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