NCP1212_05 ONSEMI [ON Semiconductor], NCP1212_05 Datasheet - Page 15

• Manufacturer Part Number: NCP1212_05
• Description: Current Mode PWM Controller for Both Forward and Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

Internal 5.0 V Regulator
the device operation and reference voltages generation. This
voltage not accessible externally and is designed to operate
with no external bypass capacitor.
Totem Pole Output Driver
was specifically designed for direct drive of power
MOSFETs. It is capable of up to 300 mA peak drive current
and has a typical rise time and fall time of 25 ns with 1.0 nF
load.
A low current 5.0 V regulator is available internally for
NCP1212 contains a single totem pole output stage that
To Bulk Capacitor
R
R
Upper
Lower
BOK
Figure 39. Brownout Detect Block Diagram
45 mA
SW2
+5 V
http://onsemi.com
±
+
−
NCP1212
+
−
15
1.21 V
Output
+
−
Overvoltage Protection and Under Voltage Lockout
Overvoltage Protection (OVP) will be triggered if V
exceeds 25 V and on the other hand, Under Voltage Lockout
(UVLO) will take place if V
continues to draw 3.0 mA typical after overload or
overvoltage shutdown is triggered. If the startup resistance
connected to V
keeps on dropping after shutdown, NCP1212 will restart once
V
persists, NCP1212 will enter hi−cup operation. In case system
latchoff is required in fault conditions, a smaller startup
resistance can be used to sustain the device operation.
NCP1212 will remain in shutdown mode as long as V
maintained above UVLO threshold after fault is detected.
CC
NCP1212 starts operation once V
drops below UVLO threshold. If the fault condition
CC
pin is large enough such that V
Brownout Shutdown
CC
drops below 10 V. NCP1212
CC
reaches 15 V.
CC
voltage
CC
CC
is