OBGZ11
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OBGZ11 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications.
PWM switching frequency at normal operation is
internally fixed and is trimmed to tight range. At no
load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved.
VCC low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OBGZ11.
OBGZ11
offers
comprehensive
protection
coverage with auto-recovery including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), VCC under voltage lockout (UVLO), over
temperature protection (OTP), and over voltage
protection (OVP). Excellent EMI performance is
achieved with On-Bright proprietary frequency
shuffling technique.
The tone energy at below 25KHz is minimized in
the design and audio noise is eliminated during
operation.
OBGZ11 is offered in SOT23-6 package.
FEATURES
■
■
■
■
■
■
APPLICATIONS
Offline AC/DC flyback converter for
■
Printer, Storage power supply
■
Power Adapter
TYPICAL APPLICATION
AC IN
EMI
Filter
ig
ht
C
on
fid
Vaux
Power on soft start reducing MOSFET Vds
stress
Frequency shuffling for EMI
Extended burst mode control for improved
efficiency and low standby power design
Audio noise free operation
Over Load operation with increased frequency
Comprehensive protection coverage
o
VCC Under Voltage Lockout with
hysteresis (UVLO)
o
VCC Over Voltage Protection (VCC OVP)
o
Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o
Over Load Protection (OLP) with auto-
recovery
o
External (if NTC resistor is connected at
PRT pin)or internal Over Temperature
Protection (OTP)
o
Output Over Voltage Protection(Output
OVP) and the OVP triggered voltage can
be adjusted by the resistor connected
between auxiliary winding and PRT pin
o
Output diode short protection with auto-
recovery
en
t
-1-
Br
OBGZ11
n-
GND GATE
FB
PRT
VCC
CS
O
©On-Bright Electronics
Confidential
ia
lt
DC
Out
o
Datasheet
OB_DOC_DS_GZ11A0
标
品
OBGZ11
High Performance Current Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
Absolute Maximum Ratings
Parameter
Value
VCC DC Supply Voltage
FB Input Voltage
V
OVP
-1V
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
GND
FB
PRT
1
2
3
6
5
4
Gate
VCC
CS
CS Input Voltage
PRT Input Voltage
Min/Max Operating
Junction Temperature TJ
Operating Ambient
Temperature T
A
Min/Max Storage
Temperature Tstg
Package Dissipation Rating
Package
RJA(℃/W)
SOT23-6
200
Recommended operating condition
Symbol Parameter
Range
VCC
VCC Supply Voltage
12 to 26V
on
fid
OBGZ11
X
Package
M:SOT23-6
C
High Performance Current Mode PWM
Controller
Marking Information
Br
ig
ht
Z11YWW
. ZZZ
S
O
n-
Y:Year Code
WW:Week Code(01-52)
S: Internal code
ZZZ: Lot code
©On-Bright Electronics
en
t
X
-2-
“absolute
maximum ratings” may cause permanent damage to the device.
These are stress ratings only, functional operation of the device
at these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Confidential
ia
lt
Green Package
P:Green
(Halogen-free)
Ordering Information
Part Number
Description
SOT23-6, Halogen-free in
OBGZ11MP
T&R
Lead
Temperature
260
℃
(Soldering, 10secs)
Note:
Stresses beyond those listed under
o
Datasheet
OB_DOC_DS_GZ11A0
标
品
-40 to 150
℃
-40 to 85
℃
-55 to 150
℃
OBGZ11
High Performance Current Mode PWM Controller
TERMINAL ASSIGNMENTS
Pin Name
GND
FB
I/O
P
I
Description
Ground
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin CS.
Dual functions pin. Connecting a NTC resistor to ground for OTP detection.
Connecting a resistor from Vaux can adjust OVP trigger voltage. If both OTP and
OVP are needed, a diode should be connected between PRT pin and the NTC
resistor.
Current sense input
Power Supply
Totem-pole gate driver output for power MOSFET
PRT
CS
VCC
Gate
I
I
P
O
O
n-
©On-Bright Electronics
Br
ig
ht
C
on
fid
Confidential
-3-
Datasheet
OB_DOC_DS_GZ11A0
en
t
ia
lt
o
标
品
OBGZ11
High Performance Current Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(T
A
= 25℃, VCC=18V, unless otherwise noted)
Symbol
Parameter
Supply Voltage (VDD)
Istartup
VCC Start up Current
Test Conditions
VCC=UVLO(OFF)-1V,
measure
leakage
current into VCC
VDD=18V,CS=4V,
FB=3.5V,measure
I(VCC)
CS=0V,FB=0.5V,
measure I(VCC)
Min
Typ. Max
Unit
2
5
uA
I_VCC_Operation
I_VCC_Burst
UVLO(ON)
UVLO(OFF)
Vpull-up
Operation Current
Burst Current
VCC Under Voltage Lockout
Enter
VCC Under Voltage Lockout
Exit (Recovery)
Pull-up PMOS active
o
ia
lt
10
6.5
14.7 16.2 17.7
FB=3V,CS=0V. Slowly
VCC Over Voltage Protection
OVP
ramp VCC, until no 26.5 28
29.5
threshold voltage
gate switching.
Feedback Input Section(FB Pin)
V
FB
Open
V
FB
Open Loop Voltage
5.1
Avcs
PWM input gain
∆VFB/∆VCS
3.5
Maximum
duty Max
duty
cycle
@
75
80
85
cycle
VCC=18V,VFB=3V,VCS=0V
Vref_green
The threshold enter green mode
2.1
Vref_burst_H
The threshold exits burst mode
1.33
The threshold enters burst
Vref_burst_L
1.23
mode
Short FB pin to GND
I
FB
_Short
FB pin short circuit current
0.21
and measure current
Open loop protection, FB
V
TH
_OLP
4.4
Threshold Voltage
Open loop protection,
Td_OLP
15
Debounce Time
Z
FB
_IN
Input Impedance
30
Current Sense Input(CS Pin)
SST_CS
Soft start time for CS peak
4
T_blanking
Leading edge blanking time
300
From Over Current
Over Current Detection and Occurs till the Gate
Td_OC
90
Control Delay
driver output start to
turn off
Internal
Current
Limiting
V
TH
_OC
Threshold Voltage with zero
0.43 0.45 0.47
duty cycle
V
TH
_OC_Clamp
OCP CS voltage clamper
0.72
Over Current protection
Td_OCP
60
debounce Time
PRT pin
en
t
-5-
on
fid
C
ig
ht
n-
Br
O
©On-Bright Electronics
Confidential
Datasheet
OB_DOC_DS_GZ11A0
标
品
2.5
3
mA
0.55 0.75
8.1
mA
7.3
V
V
V
V
V
V/V
%
V
V
V
mA
V
ms
KΩ
ms
ns
ns
V
V
ms
微控制器 MCU
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