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PDF CR6850 Data sheet ( Hoja de datos )
| Número de pieza | CR6850 | |
| Descripción | Novel Low Cost Green-Power PWM Controller | |
| Fabricantes | Chip-Rail | |
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CR6850
Novel Low Cost Green-Power PWM Controller
Features
z Low Cost, PWM&PFM&CRM (Cycle
Reset Mode)
z Low Start-up Current (about 8µA)
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 Audio Noise Free Operation
z Leading edge Blanking on Sense input
z Constant output power limiting for
universal AC input
z Cycle-by-cycle current limiting
z Soft clamped gate output voltage 16.8V
z Over voltage protect 25.5V
z High-Voltage CMOS Process with ESD
z SOT-23-6L SOP8 & DIP-8 Pb-Free
Packaging
z Compatible with SG5701 & SG5848 &
LD7535 & OB2262/63
Applications
z Switching AC/DC Adaptor
z Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
General Description
The CR6850 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
green-power functions. With a very low
start-up current, the CR6850 could use a
large value start-up resistor (2Mohm).
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 CR6850 offers more protection like
OVP (Over Voltage Protection) and OCP
(Over current protection). The CR6850’s
output driver is soft clamped to maximum
16.8V to protect the power MOSFET.
Excellent EMI performance is achieved soft
switching control at the totem pole gate
driver output. CR6850 is offered in
SOT-23-6, SOT-8 and DIP-8 packages.
Dec, 2006 V1.5
TEL:0755-25311262 FAX:0755-25311968
web:www.kingkeyelec.com
1/15
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1 page  
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CR6850
TYPICAL CHARACTERISTICS
VDD startup Current VS Temperature
VDD (OFF) VS Temperature
VDD Operation Current VS Temperature
PWM frequency VS Temperature
VDD (ON) VS Temperature
Duty cycle VS Temperature
Dec, 2006 V1.5
TEL:0755-25311262 FAX:0755-25311968
web:www.kingkeyelec.com
5/15
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5 Page 
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CR6850
Dimensions DISCLAIMERS
Symbol
A
A1
b
c
D
E
e
F
H
L
θ˚
Min.
1.346
0.101
4.648
3.810
1.016
Millimeter
Typ.
0.406
0.203
1.270
0.381X45
5.791
0.406
0
Max.
1.752
0.254
4.978
3.987
1.524
6.197
1.270
8
Min.
0.053
0.004
0.183
0.150
0.040
0.228
0.016
0
Inch
Typ.
0.016
0.008
0.050
0.015X45
Max.
0.069
0.010
0.196
0.157
0.060
0.244
0.050
8
Dec, 2006 V1.5
TEL:0755-25311262 FAX:0755-25311968
web:www.kingkeyelec.com
11/15
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CR6850.PDF ] | |
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