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SI9102DN02-T1 数据表(PDF) 5 Page - Vishay Siliconix

部件名 SI9102DN02-T1
功能描述  3-W High-Voltage Switchmode Regulator
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制造商  VISHAY [Vishay Siliconix]
网页  http://www.vishay.com
标志 VISHAY - Vishay Siliconix

SI9102DN02-T1 数据表(HTML) 5 Page - Vishay Siliconix

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Document Number: 70001
S-70497-Rev. H, 19-Mar-07
www.vishay.com
5
Vishay Siliconix
Si9102
PIN CONFIGURATIONS
DETAIL DESCRIPTION
Pre-Regulator/Start-Up Section
Due to the low quiescent current requirement of the Si9102
control circuitry, bias power can be supplied from the unreg-
ulated input power source, from an external regulated low-
voltage supply, or from an auxiliary "bootstrap" winding on
the output inductor or transformer.
When power is first applied during start-up, + VIN will draw a
constant current. The magnitude of this current is determined
by a high-voltage depletion MOSFET device which is con-
nected between + VIN and VCC. This start-up circuitry pro-
vides initial power to the IC by charging an external bypass
capacitance connected to the VCC pin. The constant current
is disabled when VCC exceeds 9.4 V. If VCC is not forced to
exceed the 9.4 V threshold, then VCC will be regulated to a
nominal value of 9.4 V by the pre-regulator circuit.
As the supply voltage rises toward the normal operating con-
ditions, an internal undervoltage (UV) lockout circuit keeps
the output MOSFET disabled until VCC exceeds the under-
voltage lockout threshold (typically 8.8 V). This guarantees
that the control logic will be functioning properly and that suf-
ficient gate drive voltage is available before the MOSFET
turns on. The design of the IC is such that the undervoltage
lockout threshold will not exceed the pre-regulator turn-off
voltage. Power dissipation can be minimized by providing an
external power source to VCC such that the constant current
source is always disabled.
Note: During start-up or when VCC drops below 9.4 V the
start-up circuit is capable of sourcing up to 20 mA. This may
lead to a high level of power dissipation in the IC (for a 48 V
input, approximately 1 W). Excessive start-up time caused
by external loading of the VCC supply can result in device
damage. Figure 4 gives the typical pre-regulator current at
start-up as a function of input voltage.
PDIP-14
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Top View
PLCC-20
14
15
16
17
18
8
7
6
5
4
1
2
319
20
11
10
913
12
Top View
PIN DESCRIPTION
Function
Pin
14-Pin DIP
20-Pin PLCC*
BIAS
1
2
+ VIN
23
DRAIN
3
5
SOURCE
4
7
- VIN
58
VCC
69
OSC OUT
7
10
OSC IN
8
11
DISCHARGE
9
12
VREF
10
14
SHUTDOWN
11
16
RESET
12
17
COMP
13
18
FB
14
20
*Pins 1, 4, 6, 13, 15, and 19 = N/C
ORDERING INFORMATION
Standard
Part Number
Lead (Pb)-free
Part Number
Temperature
Range
Package
Si9102DJ02
Si9102DJ02-E3
- 40 to 85 °C
PDIP-14
Si9102DN02
Si9102DN02-E3
PLCC-20
Si9102DN02-T1
(With Tape
and Reel)
Si9102DN02-T1-E3
(With Tape
and Reel)


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