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PDF CR6851 Data sheet ( Hoja de datos )
| Número de pieza | CR6851 | |
| Descripción | Novel Low Cost Green-Power PWM Controller | |
| Fabricantes | Chip-Rail | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CR6851 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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CR6851
Novel Low Cost Green-Power PWM Controller
With Soft Start & Frequency Jitter
Feature
z Low Cost, PWM&PFM&CRM (Cycle
Reset Mode)
z Low Start-up Current (about 1.5µA)
z Low Operating Current (about 2.2mA)
z Current Mode Operation
z Under Voltage Lockout (UVLO)
z Built-in Synchronized Slope
Compensation
z Built-in fixed soft start with 1.2mS
z Built-in Frequency jitter for better EMI
Signature
z Programmable PWM Frequency
z Audio Noise Free Operation
z Leading edge Blanking on Sense input
z Constant output power limiting for
universal AC input Range
z SOT-23-6L SOP8 and DIP-8 Pb-Free
Packaging
z Compatible with SG6848 (6849) /
SG5701/SG5848/LD7535 (7550) /
OB2262 (2263)/OB2278 2279
z Complete Protection with
¾ Soft Clamped GATE output voltage
16.5V
¾ VDD over voltage protect 25.6V
¾ Cycle-by-cycle current limiting
¾ Sense Fault Protect ion
¾ OTP (Over Temperature Protection)
¾ Output SCP (Short circuit Protection)
¾ Output OLP (Over Load Protection)
¾ Latch mode After OLP&SCP
¾ High-Voltage CMOS Process with ESD
Applications
z Switching AC/DC Adaptor
z Battery Charger
z Open Frame Switching Power Supply
z Standby Power Supplies
z Set-Top Box Power Supplies
z 384X Replacement
General Description
The CR6851 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 (Cycle
Reset Mode) under light-load/zero-load
conditions. This can minimize standby
power consumption and achieve
power-saving functions. With a very low
start-up current, the CR6851 could use a
large value start-up resistor (2Mohms).
Built-in synchronized slope compensation
enhances the stability of the system and
avoids sub-harmonic oscillation. Dynamic
peak current 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
Dec, 2006 V1.2
Chengdu Chip-Rail Tech. Co., Ltd.
1/13
http://www.chiprail.com
1 page  
CR6851 Product Specification
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
VDDCLAMP
VDDAIS
Turn-on Threshold Voltage
Turn-off Threshold Voltage
VDD Clamp Voltage
Anti Intermission Surge
VDD Voltage
VFB=0V
VFB=3V
VFB=Open
IVDD=20mA
1.5
3.2
2.2
1.65
12.8
7.8
25.6
12.7
µA
mA
mA
mA
V
V
V
V
TSS
TOFF
TRESTART
Soft start Time
Over temperature Protection
Temperature restart
1.2 mS
130
100
Voltage Feedback (FB Pin)
IFB Short Circuit Current
VFB Open Loop Voltage
IFB_0D Zero Duty Cycle FB current
IPFM Enter PFM FB current
ICRM Enter CRM FB current
VPFM
Enter PFM Threshold VFB
VCRM Enter CRM Threshold VFB
IOLP&SCP Enter OLP&SCP FB current
VOLP&SCP Enter OLP&SCP FB voltage
TOLP&SCP OLP&SCP min. delay Time
VFB=0V
VFB=Open
RI=100K
1.57
4.6
1.47
1.37
1.45
0.51
0.30
152
4.2
33 50
mA
V
mA
mA
mA
V
V
uA
V
mS
Current Sensing (SEN Pin)
VTH_L SEN Minimum Voltage Lever
VTH_H SEN Maximum Voltage Lever
TPD Delay to Output
RCS Input Impedance
VSCP Sense short protect voltage
TSCP Sen. short protect Delay Time
Dec, 2006 V1.2
Chengdu Chip-Rail Tech. Co., Ltd.
0.65 V
0.85 V
150 ns
50 KΩ
177 mV
1.2 mS
5/13
http://www.chiprail.com
5 Page 
CR6851 Product Specification
PACKAGE DEMENSIONS
DIP-8L
Dimensions
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ˚
Min.
0.381
3.175
9.017
6.223
2.921
8.509
0˚
Millimeters
Typ.
Max.
5.334
3.302
1.524
0.457
9.271
7.620
6.350
2.540
3.302
9.017
7˚
3.429
10.160
6.477
3.810
9.525
15˚
Min.
0.015
0.125
0.355
0.245
0.115
0.335
0˚
Inches
Typ.
0.130
0.060
0.018
0.365
0.300
0.250
0.100
0.130
0.355
7˚
Max.
0.210
0.135
0.400
0.255
0.150
0.375
15˚
Dec, 2006 V1.2
Chengdu Chip-Rail Tech. Co., Ltd.
11/13
http://www.chiprail.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CR6851.PDF ] | |
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