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PDF FSDH0370RNB Data sheet ( Hoja de datos )
| Número de pieza | FSDH0370RNB | |
| Descripción | (FSDH0x70RNB) Green Mode Fairchild Power Switch | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
March 2006
FSDH0170RNB/FSDH0270RNB/FSDH0370RNB
Green Mode Fairchild Power Switch (FPS™)
Features
Internal Avalanche Rugged 700V Sense FET
Consumes only 0.8W at 230 VAC & 0.5W load with
Burst-Mode Operation
Frequency Modulation for EMI Reduction
Precision Fixed Operating Frequency, 100kHz
Internal Start-up Circuit and Built-in Soft Start
Pulse-by-Pulse Current Limiting and Auto-Restart
Mode
Over Voltage Protection (OVP), Over Load Protection
(OLP), Internal Thermal Shutdown Function (TSD)
Under Voltage Lockout (UVLO)
Low Operating Current (3mA)
Adjustable Peak Current Limit
Applications
Auxiliary Power Supply for PC and Server
SMPS for VCR, SVR, STB, DVD & DVCD Player
SMPS for Printer, Facsimile & Scanner
Adapter for Camcorder
Related Application Notes
AN-4137, AN-4141, AN-4147 (Flyback)
AN-4134 (Forward)
Description
The FSDH0170RNB/FSDH0270RNB/FSDH0370RNB
consists of an integrated current mode Pulse Width Mod-
ulator (PWM) and an avalanche rugged 700V Sense
FET. It is specifically designed for high performance off-
line Switch Mode Power Supplies (SMPS) with minimal
external components. The integrated PWM controller
features include : a fixed oscillator with frequency mod-
ulation for reduced EMI, Under Voltage Lock Out (UVLO)
protection, Leading Edge Blanking (LEB), an optimized
gate turn-on/ turn-off driver, Thermal Shut Down (TSD)
protection, and temperature compensated precision cur-
rent sources for loop compensation and fault protection
circuitry. Compared to a discrete MOSFET and controller
or RCC switching converter solution, the FSDH0170RNB/
FSDH0270RNB/FSDH0370RNB reduces total compo-
nent count, design size, and weight while increasing
efficiency, productivity, and system reliability. These
devices provide a basic platform that is well suited for the
design of cost-effective flyback converters, as in PC
auxiliary power supplies.
Ordering Information
Product Number
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
Package
8DIP
8DIP
8DIP
Marking Code
DH0170R
DH0270R
DH0370R
BVDSS
700V
700V
700V
fOSC
100KHz
100KHz
100KHz
RDS(ON) (MAX.)
11Ω
7.2Ω
4.75Ω
©2006 Fairchild Semiconductor Corporation
1
FSDH0170RNB/FSDH0270RNB/FSDH0370RNB Rev. 1.0.2
www.fairchildsemi.com
1 page  
www.DataSheet4U.com
Electrical Characteristics
(TA = 25°C unless otherwise specified)
Symbol
Parameter
Sense FET Section11
IDSS Zero-Gate-Voltage Drain Current
RDS(ON)
Drain-Source
On-State
Resistance10
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
CISS
Input Capacitance
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
COSS
Output Capacitance
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
CRSS
Reverse Transfer
Capacitance
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
td(on)
Turn-On Delay Time
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
tr Rise Time
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
td(off)
Turn-Off Delay Time
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
tf Fall Time
FSDH0170RNB
FSDH0270RNB
FSDH0370RNB
Control Section
fOSC
ΔfMOD
ΔfOSC
DMAX
DMIN
VSTART
VSTOP
IFB
tS/S
Switching Frequency
Switching Frequency Modulation
Switching Frequency Variation11
Maximum Duty Cycle
Minimum Duty Cycle
UVLO Threshold Voltage
Feedback Source Current
Internal Soft Start Time11
Condition
VDS = 700V, VGS = 0V
VDS = 560V, VGS = 0V,
TC = 125°C
VGS = 10V, ID = 0.5A
VGS = 0V, VDS = 25V,
f = 1MHz
VDS = 350V, ID = 1.0A
-25°C ≤ TA ≤ 85°C
Measured @0.1 x Vds
VFB = GND
VFB = GND
VFB = GND
VFB = 4V
Min. Typ. Max. Unit
– – 50 μA
– – 200
– 8.8 11 Ω
– 6.0 7.2
– 4.0 4.75
– 250 –
pF
– 550 –
– 315 –
– 25 –
– 38 –
– 47 –
– 10 –
– 17 –
–9–
– 12 – ns
– 20 –
– 11.2 –
–4–
– 15 –
– 34 –
– 30 –
– 55 –
– 28.2 –
– 10 –
– 25 –
– 32 –
92 100 108 KHz
±2 ±3 ±4 KHz
– ±5 ±10 %
62 67 72 %
0 0 0%
11 12 13
V
789
0.7 0.9 1.1 mA
– 10 – ms
5
FSDH0170RNB/FSDH0270RNB/FSDH0370RNB Rev. 1.0.2
www.fairchildsemi.com
5 Page 
www.DataSheet4U.com
fs=1/ts
103kHz
100kHz
97kHz
Drain
Current
ts
4ms t
Figure 9. Frequency Modulation Waveform
8. Adjusting Peak Current Limit: As shown in Figure
10, a combined 2.8kΩ internal resistance is connected to
the non-inverting lead on the PWM comparator. An
external resistance of Rx on the current limit pin forms a
parallel resistance with the 2.8kΩ when the internal
diodes are biased by the main current source of 900µA.
Vcc Vcc
Vfb IDELAY
3
5uA
IFB
900uA
2kΩ
Ipk
4
0.8kΩ
Rx
PWM
Comparator
SenseFET
Current
Sense
Figure 10. Peak Current Limit Adjustment
For example, FSDH0270RNB has a typical Sense FET
peak current limit (ILIM) of 0.9A. ILIM can be adjusted to
0.6A by inserting Rx between the Ipk pin and the ground.
The value of the Rx can be estimated by the following
equations:
0.9A : 0.6A = 2.8kΩ : XkΩ,
X = Rx || 2.8kΩ.
(X represents the resistance of the parallel network)
11
FSDH0170RNB/FSDH0270RNB/FSDH0370RNB Rev. 1.0.2
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet FSDH0370RNB.PDF ] | |
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