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Teilenummer | OB2201 |
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Beschreibung | High Performance Quasi-Resonant PWM Controller | |
Hersteller | On-Bright Electronics | |
Logo | ||
Gesamt 13 Seiten OB2201
High Performance Quasi-Resonant PWM Controller
Product Specification
GENERAL DESCRIPTION
OB2201 is a high performance flyback Quasi-
Resonant (QR) controller optimized to achieve
high efficiency in the universal input range and full
loading range with effective system cost.
At full loading, the IC operates in fix frequency
(52KHz) CCM mode in the low line input range
and operates in QR mode in high line input range.
In this way, high efficiency in the universal input
range at full loading can be achieved.
At normal load condition, it operates in QR mode.
To minimize switching loss, the maximum
switching frequency in QR mode is internally
limited to 90 KHz. When the loading goes low, it
operates in PFM mode for high power conversion
efficiency. When the load is very small, the IC
operates in ‘Extended Burst Mode’ to minimize the
standby power loss. As a result, high conversion
efficiency can be achieved in the whole loading
range.
OB2201 offers comprehensive protection
coverage including Cycle-by-Cycle Current
Limiting (OCP), VCC Under Voltage Lockout
(UVLO), Output Over Voltage Protection (OVP),
Over Temperature Protection (OTP), Over Load
Protection (OLP), VCC Over Voltage Protection
(VCC OVP), VCC Clamp, and Gate Clamp.
OB2201 also features protections against pin
open and short conditions on selected pins.
OB2201 is offered in SOP-8 and DIP-8 packages.
TYPICAL APPLICATION
FEATURES
■ Multi-Mode Operation:
• At Full Loading, Fix Frequency (52KHz)
CCM Operation @ Low Line and QR Mode
Operation @ High Line Input
• Quasi-Resonant Operation at Normal
Load
• Pulse Frequency Modulation (PFM)
Operation at Light Load
• Burst Mode at No Load
■ Adaptive Frequency Shuffling and Slope
Compensation @ Fix Frequency CCM Mode
■ Programmable OTP with latch Shutdown
■ Fixed 4ms Soft-start
■ 2.5us Minimum Off Time
■ 12.5us Maximum On Time Limit
■ 55us Maximum Off Time Limit
■ 90KHz Maximum Frequency Limit
■ Internal Leading Edge Blanking
■ Output Over Voltage Protection
■ 800mA Peak Current Sink/Source Capability
APPLICATIONS
Offline AC/DC flyback converter for
■ Power Adaptor and Open-frame SMPS
■ Set-Top Box Power Supplies
■ NB/DVD
AC
OB2201
NTC
1 RI
RT 8
2 FB
DEM 7
3 CS
4 GND
VCC 6
GATE 5
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2201A1
http://www.Datasheet4U.com
OB2201
High Performance Quasi-Resonant PWM Controller
VTH_OVP
T_OVP_delay
Output OVP trigger point
Number of subsequent
cycles to be true OVP
- 3.75 - V
- 4 - Cycle
Soft Start Section
T_soft
Internal soft startup
4 ms
Timer Section
RI_range
V_RI_open
Fburst
Operating RI resistor
range
RI open voltage
Burst mode switching
frequency
RI=20K
14 20 26 Kohm
2.0 V
- 22 - KHz
Fmax_QR_H
Fmin_QR_L
Frequency high clamp in
QR mode
Frequency low clamp in
QR mode
RI=20K
RI=20K
82 90 98 KHz
47 52 57 KHz
△F(shuffle)/F
Ton_max
Toff_max
Fmin_QR_L frequency
shuffling range
Maximum on time
Maximum off time
RI=20K
RI=20K
-4 +4 %
10 12.5 15 us
40 55 75 us
G_PFM
PFM mode frequency
modulation slope versus
control voltage
-
90 -
KHz/
V
Over temperature Protection
I_RT
Output current of RT pin, RI=20K
100 uA
Vth_OTP
OTP threshold voltage
1.00 1.05 1.10 V
V_RT_open
RT pin open voltage
3.5 V
Latch Protection
V_latch_release VCC latch release voltage
-- 6.3 -- V
Ivdd(latch)
VCC current when latch
off
VCC=V_latch_release+1V
-
45 -
uA
Gate Drive Output (GATE Pin)
VOL
Output Low Level
VOH
Output High Level
VG_Clamp
Output Clamp Voltage
Level
T_r Output Rising Time
T_f Output Falling Time
Io = 100 mA (sink)
Io = 100 mA (source)
VCC=20V
CL = 1nf
CL = 1nf
--
7.5 -
1
-
- 16.5 -
- 80 -
- 30 -
V
V
V
ns
ns
©On-Bright Electronics
Confidential
-6-
Datasheet
OB_DOC_DS_2201A1
6 Page 8-Pin Plastic SOP
OB2201
High Performance Quasi-Resonant PWM Controller
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
Dimensions In Millimeters
Min
1.350
Max
1.750
0.050
0.250
1.250
1.650
0.310
0.510
0.170
0.250
4.700
5.150
3.800
4.000
5.800
6.200
1.270 (BSC)
0.400
1.270
0º 8º
Dimensions In Inches
Min
0.053
Max
0.069
0.002
0.010
0.049
0.065
0.012
0.020
0.006
0.010
0.185
0.203
0.150
0.157
0.228
0.244
0.05 (BSC)
0.016
0.050
0º 8º
©On-Bright Electronics
Confidential
- 12 -
Datasheet
OB_DOC_DS_2201A1
12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ OB2201 Schematic.PDF ] |
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