NCP1396BDR2G ON Semiconductor, NCP1396BDR2G Datasheet - Page 20

• Manufacturer Part Number: NCP1396BDR2G
• Description: IC CTRLR OVP HV 16SOIC
• Manufacturer: ON Semiconductor
• Type: High Performance Resonant Mode Controllersr

Specifications of NCP1396BDR2G

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 575kHz
• Duty Cycle: 52%
• Voltage - Supply: 10.5 V ~ 20 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (3.9mm Width, 15 Leads)
• Frequency-max: 575kHz
• Output Voltage Range: 20 V
• Output Current: 300 uA
• Power Dissipation: 42 mW
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Input Voltage: 12V
• Frequency: 500kHz
• Supply Voltage Range: 20V
• Digital Ic Case Style: SOIC
• No. Of Pins: 16
• Svhc: No SVHC (15-Dec-2010)
• Base Number: 1396
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NCP1396BDR2GOS; NCP1396BDR2GOS; NCP1396BDR2GOSTR

(Mlower and Mupper pulse), the IBO source is activated
and creates a hysteresis. As a result, it becomes possible to
select the turn- - on and turn- - off levels via a few lines of
algebra:
IBO is off
IBO is on
We can now extract Rlower from equation 1 and plug it into
equation 2, then solve for Rupper:
V(+) = V
To the contrary, when the internal BO signal is high
R
bulk2
lower
V(+) = V
R
upper
×
= VBO ×
Vout
Figure 46. Adding a comparator on the BO pin offers a way to latch- -off the controller
R
lower
= R
R
450
350
250
150
50
bulk1
lower
+ R
lower
IBO × (V
upper
×
16.0
12.0
8.0
4.0
×
Figure 45. Simulation Results for 350 / 250 ON / OFF Levels
R
V
0
V
bulk1
lower
+ IBO ×
bulk1
R
bulk1
VBO
− V
lower
+ R
20 m
− VBO
NTC
Vin
V
− VBO)

bulk2
upper
CC
Q1
R
R
351 Volts
lower
lower
60 m
× R
+ R
Vbulk
BO
http://onsemi.com
(eq. 1)
(eq. 2)
(eq. 3)
(eq. 4)
upper
upper
time in seconds
Rupper
Rlower

100 m
BO
20
350 V and turn it off for Vbulk2 equals 250 V, then for A
version (IBO_A = 26.5 mA, VBO = 1.04 V) we obtain:
Rupper = 3.77 MΩ
Rlower = 11.25 kΩ
The bridge power dissipation is 400
when front- - end PFC stage delivers 400 V.
Figure 45 simulation result confirms our calculations.
Latch- -off Protection
fully turned- - off and stay latched. This can happen in
presence of an over- - voltage (the feedback loop is drifting)
or when an over temperature is detected. Thanks to the
addition of a comparator on the BO pin, a simple external
circuit can lift up this pin above VLATCH (4 V typical) and
permanently disable pulses. The V
down below 6.5 V typically to reset the controller.
If we decide to turn- - on our converter for Vbulk1 equals
There are some situations where the converter shall be
+
VBO
140 m
+
Vlatch
+
- -
IBO
+
250 Volts
- -
20 ms
RC
180 m
To permanent
latch
Vdd
2
CC
/ 3.781 MΩ = 42 mW
BO
needs to be cycled