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PDF FAN302HLMY_F117 Data sheet ( Hoja de datos )
| Número de pieza | FAN302HLMY_F117 | |
| Descripción | PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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June 2012
FAN302HLMY_F117
PWM Controller for Low Standby Power Battery-
Charger Applications — mWSaver™ Technology
Features
mWSaver™ Technology Provides Industry’s
Best-in-Class Standby Power
- Achieves <10mW Below Energy Star’s 5-Star
Level: <30mW
- Proprietary 500V High-Voltage JFET Startup
Reduces Startup Resistor Loss
- Low Operation Current in Burst Mode:
350µA Maximum
Constant-Current (CC) Control without Secondary-
Feedback Circuitry
Fixed PWM Frequency at 85kHz with Frequency
Hopping to Reduce EMI
High-Voltage Startup
Low Operating Current: 3.5mA
Peak-Current-Mode Control with Slope
Compensation
Cycle-by-Cycle Current Limiting
VDD Over-Voltage Protection (Auto-Restart)
VS Over-Voltage Protection (Latch Mode)
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 15V
Fixed Over-Temperature Protection (Latch Mode)
Available in an 8-Lead SOIC Package
Applications
Battery Chargers for Cellular Phones, Cordless
Phones, PDAs, Digital Cameras, and Power Tools
Replaces Linear Regulators and RCC SMPS
Ordering Information
Part Number
Operating
Temperature Range
FAN302HLMY_F117
-40°C to +105°C
Description
The FAN302HLMY_F117 advanced PWM controller
significantly simplifies isolated power supply design that
requires CC regulation of the output. The output current
is precisely estimated with information in the primary
side of the transformer and controlled with an internal
compensation circuit. This removes the output current
sensing loss and eliminates all external Control Circuitry
(CC). The Green-Mode function, with an extremely low
operating current (200µA) in Burst Mode, maximizes the
light-load efficiency, enabling conformance to worldwide
Standby Mode efficiency guidelines.
Integrated protections include two-level pulse-by-pulse
current limit, Over-Voltage Protection (OVP), brownout
protection, and Over-Temperature Protection (OTP).
Compared with a conventional approach using an
external control circuit in the secondary side for CC
regulation, the FAN302HLMY_F117 can reduce total
cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability.
VO Maximum
Typical
Minimum
IO
Figure 1. Typical Output V-I Characteristic
Package
8-Lead, Small Outline Package (SOIC),
JEDEC MS-012, .150-Inch Narrow Body
Packing
Method
Tape & Reel
© 2012 Fairchild Semiconductor Corporation
FAN302HLMY_F117 • Rev. 1.0.1
www.fairchildsemi.com
1 page  
Electrical Characteristics
VDD=15V and TA=25°C unless noted.
Symbol
Parameter
HV Section
VHV-MIN Minimum Startup Voltage on HV Pin
IHV Supply Current Drawn from HV Pin
IHV-LC Leakage Current Drawn from HV Pin
VDD Section
VOP Continuous Operation Voltage
VDD-ON
VDD-OFF
VDD-LH
IDD-ST
IDD-OP
IDD-BURST
VDD-OVP
tD-VDDOVP
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Threshold Voltage for Latch-Off Release
Startup Current
Operating Supply Current
Burst-Mode Operating Supply Current
VDD Over-Voltage Protection Level
VDD Over-Voltage Protection Debounce
Time
Oscillator Section
fOSC Frequency
Center Frequency
Hopping Range
fOSC-CM-MIN
fOSC-CCM
Minimum Frequency for Continuous
Conduction Mode (CCM) Prevention
Circuit(4)
Minimum Frequency in Constant Current
(CC) Regulation
Feedback Input Section
AV
Internal Voltage Scale-Down Ratio of FB
Pin(5)
ZFB FB Pin Input Impedance
VFB-OPEN FB Pin Pull-Up Voltage
VFB-L
FB Threshold to Disable Gate Drive in
Burst Mode
VFB-H
FB Threshold to Enable Gate Drive in
Burst Mode
Over-Temperature Protection Section
TOTP
Threshold for Over-Temperature
Protection (OVP)
Condition
Min. Typ. Max. Unit
50 V
VHV=100V, VDD=0V,
Controller Off
0.8 1.5 5.0 mA
VHV=500V, VDD=15V
(Controller On with Auxiliary
Supply)
0.8 3.0 μA
Limited by VDD Over-Voltage
Protection (OVP)
VDD Rising
VDD Falling
VDD Falling
VDD=VDD-ON – 0.16V
VDD=18V, f=fOSC, CGATE=1nF
VDD=8V, CGATE=1nF
15
4.7
25.0
f=85kHz
16
5.0
2.5
400
3.5
200
26.5
100
25
17
5.3
450
4.0
350
28.0
180
V
V
V
V
μA
mA
μA
V
μs
VCS=5V, VS=2.5, VFB=5V
VCS=5V, VS=0V
82 85 88
kHz
±3
13 18 23 kHz
23 26 29 kHz
FB Pin Open
VFB Falling,VCS=5V, VS=0V
1/3.5 1/3.0 1/2.5 V/V
38 42 44 kΩ
5.3 V
1.2 1.4 1.6 V
VFB Rising,VCS=5V, VS=0V
1.3 1.5 1.7
V
+130 +140 +150 °C
Continued on the following page…
© 2012 Fairchild Semiconductor Corporation
FAN302HLMY_F117 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
I PK
I PK
⋅
NP
NS
< ID >AVG = IO
Figure 26. Key Waveforms of DCM Flyback
Converter
Figure 28. tDIS Variation in CC Mode
Figure 27. Detailed Waveform for ZCD
Frequency Reduction in CC Mode
An important design consideration is that the
transformer guarantee DCM operation across the whole
range since the output current is properly estimated only
in DCM operation. As can be seen in Figure 28, the
discharge time (tDIS) of the diode current increases as
the output voltage decreases in CC Mode. The
converter tends to go into CCM as output voltage drops
in CC Mode when operating at the fixed switching
frequency. To prevent this CCM operation while
maintaining good output current estimation in DCM,
FAN302HLMY_F117 decreases switching frequency as
output voltage drops, as shown in Figure 28 and Figure
29. FAN302HLMY_F117 indirectly monitors the output
voltage by the sample-and-hold voltage (VSH) of VS,
which is taken at 85% of diode current discharge time of
the previous switching cycle, as shown in Figure 27.
Figure 30 shows how the frequency reduces as the
sample-and-hold voltage of VS decreases.
© 2012 Fairchild Semiconductor Corporation
FAN302HLMY_F117 • Rev. 1.0.1
11
Figure 29. Frequency Reduction with VSH
Δf
ΔV
= SG−CC
Figure 30. Frequency Reduction Curve in
CC Regulation
www.fairchildsemi.com
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