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Part No.
Features
Function
VCC
UVLO (Typ.)
FOSC
CS(V)
Duty Cycle
Output
Package
Max.
VTH(ST)
VOPR
Max.
Typ.
Max.
Type
IO(Max.)
UC2843B
High Performance Current Mode PWM Controllers
* Latching PWM for cycle-by-cycle current limiting
* Trimmed oscillator discharge current
* Automatic feed-forward compensation
* Internally trimmed reference with UVLO
* Double-pulse suppression
Single End,Vref=±1%, OCP, SCP, LEB, UVLO
30.0V
8.4V
7.6V
500KHz
1.0V
100%
Totem-pole
1000mA
DIP-8 SOP-8
UC3842A
*Low Start Up Current ( Typical 0.12mA )
*Automatic Feed Forward Compensation
*Pulse-by-Pulse Current Limiting
*Double Pulse Suppression
*High Current Totem Pole Output to Drive MOSFET Directly
*Internally Trimmed Band Gap Reference
*500kHz Operation
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.12mA(Typ.)
30.0V
16.0V
10.0V
500KHz
1.0V
100%
Totem-pole
1000mA
DIP-8 SOP-8
UC3843A
8.4V
7.6V
UC3842B
High Performance Current Mode PWM Controllers
* Trimmed oscillator for precise frequency control
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Undervoltage lockout with hysteresis
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.)
30.0V
16.0V
10.0V
500KHz
1.0V
100%
Totem-pole
1000mA
DIP-8 SOP-8
UC3843B
8.4V
7.6V
UC3842G
* Low startup and operating current
* User defined switching frequency(Norm is 52kHz)
* Power-saving mode for low power
* Under voltage lockout with hysteresis
* Latching PWM for Cycle-By-Cycle current limiting
* Internally trimmed reference with undervoltage lockout
Single End, Hopping Technology & Frequency Burst→PFM→PWM,
500mA Driving Capability
and build in OVP,OLP,UVLO,OCP, SCP, LEB Etc.
30.0V
15.0V
10.0V
CT=3.3nF
1.0V
94%
Totem-pole
1000mA
DIP-8 SOP-8
55KHz
UC3843G
High Performance Current Mode PWM Controllers For Power Saving
Single End, Hopping Technology & Frequency Burst→PFM→PWM,
500mA Driving Capability
and build in OVP,OLP,UVLO,OCP, SCP, LEB Etc.
30.0V
8.4V
7.6V
CT=3.3nF
1.0V
94%
Totem-pole
1000mA
DIP-8 SOP-8
55KHz
UC2844
High Performance Current Mode PWM Controllers
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
Single End,Vref=±1%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.)
30.0V
16.0V
10.0V
500KHz
1.0V
50%
Totem-pole
1000mA
SOP-8
UC2845
8.4V
7.6V
UC3844
High Performance Current Mode PWM Controllers
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.)
30.0V
16.0V
10.0V
57KHz
1.0V
50%
-
-
DIP-8 SOP-8
UC3845
8.4V
7.6V
UC3846
Current Mode PWM Controller
* Built-in under-voltage lockout
* Soft start
* Programmable pulse-by-pulse current limiting
* Improved load response characteristics
* Double pulse suppression
Half Bridge/Push Pull,Vref=±2%, Shutdown,
Soft Start, OCP, SCP, LEB, UVLO,
Sync Teminal
40.0V
7.7V
0.75V
500KHz
1.2V
50%
Totem-pole
500mA
DIP-16 SOP-16 SOP-16W
