NCP1252 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1252 Datasheet PDF : 18 Pages
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Vbulk
NCP1252
NCP1252
1
8
Vcc
2
7
3
6
4
5
Vout
100 nF*
Table 1. PIN FUNCTIONS
Pin No.
Pin Name
1
FB
2
BO
3
CS
4
RT
5
GND
6
Drv
7
VCC
8
SSTART
*Minimum recommended
decoupling capacitor value
Figure 1. Typical Application
Function
Feedback
Brown−out input
Current sense
Timing element
−
Driver
VCC
Soft−start
Pin Description
This pin directly connects to an optocoupler collector.
This pin monitors the input voltage image to offer a Brown−out protection.
Monitors the primary current and allows the selection of the ramp com-
pensation amplitude.
A resistor connected to ground fixes the switching frequency.
The controller ground pin.
This pin connects to the MOSFET gate
This pin accepts voltage range from 8 V up to 28 V
A capacitor connected to ground selects the soft−start duration. The soft
start is grounded during the delay timer
Table 2. MAXIMUM RATINGS TABLE (Notes 1 and 2)
Symbol
Rating
Value
Unit
VCC
Power Supply voltage, Vcc pin, transient voltage: 10 ms with IVcc < 20 mA
30
V
VCC
Power Supply voltage, Vcc pin, continuous voltage
28
V
IVcc
Maximum current injected into pin 7
20
mA
Maximum voltage on low power pins (except pin 6, 7)
−0.3 to 10
V
RθJA – PDIP8
RθJA – SOIC8
TJMAX
Thermal Resistance Junction−to−Air – PDIP8
Thermal Resistance Junction−to−Air – SOIC8
Maximum Junction Temperature
Storage Temperature Range
131
169
150
−60 to +150
°C/W
°C/W
°C
°C
ESD Capability, HBM model
1.8
kV
ESD Capability, Machine Model
200
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests: Human Body Model 1800 V per JEDEC Standard
JESD22−A114E. Machine Model Method 200 V per JEDEC Standard JESD22−A115A.
2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.
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