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PDF CR6848 Data sheet ( Hoja de datos )
| Número de pieza | CR6848 | |
| Descripción | Npvel Low Cost Green-Power PWM Controller | |
| Fabricantes | Chip Rail | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CR6848 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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CR6848
Novel Low Cost Green-Power PWM Controller
Features
z Low Cost, PWM&PFM&CRM
z Low Start-up Current (about 10µA)
z Low Operating Current (about 2mA)
z Current Mode Operation
z Under Voltage Lockout (UVLO)
z Built-in Synchronized Slope
Compensation
z Programmable PWM Frequency
z Leading edge Blanking on Sense input
z Constant output power limiting for
universal AC input
z Cycle-by-cycle current limiting
z Clamped gate output voltage 16.5V
z Over voltage protect 26.7V
z High-Voltage CMOS Process with ESD
z SOT-23-6L SOP-8 & DIP-8 Pb-Free
Packaging
z Compatible with SG5701 & SG5848 &
LD7535 &OB22632/63
Applications
z Switching AC/DC Adaptor
z Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
General Description
The CR6848 is a highly integrated low cost
current mode PWM controller, which is ideal
for small power current mode of offline
AC-DC fly-back converter applications.
Making use of external resistors, the IC
changes the operating frequency and
automatically enters the PFM/CRM under
light-load/zero-load conditions. This can
minimize standby power consumption and
achieve green-power functions. With a very
low start-up current, the CR6848 could use
a large value start-up resistor (1.5Mohm).
Built-in synchronized slope compensation
enhances the stability of the system and
avoids sub-harmonic oscillation. Dynamic
peak limiting circuit minimizes output power
change caused by delay time of the system
over a universal AC input range. Leading
edge blanking circuit on current sense input
could remove the signal glitch due to
snubber circuit diode reverse recovery and
thus greatly reduces the external
component count and system cost in the
design. Pulse-by-pulse current limiting
ensures safe operation even during
short-circuit.
The CR6848 offers more protection like
OVP (Over Voltage Protection) and OCP
(Over current protection). The CR6848’s
output driver is clamped to maximum 16.5V
to protect the power MOSFET. Excellent
EMI performance is achieved soft switching
control at the totem pole gate driver output.
CR6848 is offered in SOT-23-6, SOP-8 and
DIP-8 packages.
Dec, 2006 V1.5
Chengdu Chip-Rail Tech.Co.Ltd.
1/14
http://www.chiprail.com
1 page  
www.DataSheet4U.com
CR6848
Electrical Characteristics (Ta=25°C unless otherwise noted, VDD = 15V.)
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
Supply Voltage (VDD Pin)
IST Startup Current
ISS Operating Current
VDDON
VDDOFF
VDCLAMP
Turn-on Threshold Voltage
Turn-off Threshold Voltage
VDD Clamp Voltage
VFB=0V
VFB=3V
VFB=Open
IVDD=20mA
10
2.8
2.3
1.46
16.1
11.1
26.7
µA
mA
mA
mA
V
V
V
Voltage Feedback (FB Pin)
IFB Short Circuit Current
VFB Open Loop Voltage
IPFM Enter PFM, FB current
ICRM Enter CRM, FB current
VFB=0V
VFB=Open
2.8 mA
4.8 V
0.92
mA
1.5 mA
Current Sensing (SEN Pin)
VTH_L Minimum Voltage Lever
VTH_H Maximum Voltage Lever
TPD Delay to Output
RCS Input Impedance
0.83 0.87
1.0 1.05
300
50
V
V
ns
KΩ
Oscillator (RI Pin)
FOSC Normal Frequency
RI=100Kohm
FPFM PFM Frequency
RI=100Kohm
DCMAX Maximum Duty Cycle
RI=100Kohm
FTEMP Frequency Temp. Stability -30-85
TBLANK Leading-Edge Blanking Time
53 58 63 KHz
11.6
KHZ
75 %
5%
300 nS
GATE Drive Output (GATE Pin)
VOL Output Low Level
VOH Output High Level
TR Rising Time
TF Falling Time
VGCLAMP Output Clamp Voltage
VDD=15V, IO=20mA
VDD=15V, IO=20mA
CL=1000pF
CL=1000pF
VDD=20V
8
450
130
16.5
1
V
V
ns
ns
V
Dec, 2006 V1.5
Chengdu
http://www.chiprail.com
Chip-Rail
5/14
Tech.Co.Ltd.
5 Page 
www.DataSheet4U.com
CR6848
SOT-23-6L
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.700
1.000
0.000
0.100
1.397
1.803
0.300
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
Dimensions In Inches
Min Max
0.028
0.039
0.000
0.004
0.055
0.071
0.012
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.003
0.010
0.012
0.024
Dec, 2006 V1.5
Chengdu Chip-Rail Tech.Co.Ltd.
11/14
http://www.chiprail.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CR6848.PDF ] | |
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