NCP1219AD100R2G ON Semiconductor, NCP1219AD100R2G Datasheet - Page 12

• Manufacturer Part Number: NCP1219AD100R2G
• Description: IC PWM CONTROLLER 100KHZ 7-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1219AD100R2G

• Output Isolation: Isolated
• Frequency Range: 95 ~ 105kHz
• Voltage - Input: 9 ~ 20 V
• Power (watts): 920mW
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width) 7 leads
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

controllers designed for ac−dc applications requiring low
standby power. The controller operates in skip or burst
mode at light load. Its high integration reduces component
count resulting in a more compact and lower cost power
supply. This device family has 2 options, A and B. Option
A latches where as option B auto restarts after an overload
fault.
self supply (DSS) allows the controller to operate without
an auxiliary supply, simplifying the transformer design.
This feature is particularly useful in applications where the
output voltage varies during operation (e.g. printer
adapters).
jittering, adjustable ramp compensation, timer based fault
detection and a dedicated latch input.
High Voltage Startup Circuit
eliminates the need for external startup components and
provides a faster startup time compared to an external
startup resistor. The startup circuit consists of a constant
current source that supplies current from the HV pin to the
supply capacitor on the V
at 500 V allowing direct connection to the bulk capacitor.
The start−up current (I
voltage reaches V
then biased by the V
enabled once the V
operating threshold (V
The NCP1219 is part of a product family of current mode
The internal high voltage startup circuit with dynamic
Other features found in the NCP1219 are frequency
The NCP1219 internal high voltage startup circuit
The startup current source is disabled once the V
Figure 25. V
V
V
CC(hiccup)
V
CC(reset)
V
CC(MIN)
Fault1
UVLO
CC(on)
DRV
CC(on)
CC
CC
CC
start
ON
, typically 12.7 V. The controller is
Double Hiccup Operation with a Fault Occurring While the Startup Circuit is Disabled.
CC(MIN)
voltage decays to its minimum
CC
capacitor. The current source is
) is typically 12.8 mA.
pin (C
) typically 9.9 V. If the
CC
Fault
). The HV pin is rated
DETAILED OPERATING DESCRIPTION
http://onsemi.com
CC
OFF
12
supply current consumption exceeds the startup current,
V
undervoltage lockout (UVLO) to prevent operation at low
V
DRV signal is immediately disabled upon reaching UVLO.
It is re−enabled if V
50 ms (typical) timer expires. Otherwise, the controller
enters double hiccup mode.
overload (option B), thermal shutdown, UVLO or latch
fault is detected. A double hiccup fault disables the DRV
signal, sets the controller in a low current mode and allows
V
is repeated twice to minimize power dissipation in external
components during a fault event. Figures 25 and 26 show
double hiccup mode operation with a fault occurring while
the startup circuit is disabled and enabled, respectively. A
soft−start sequence is initiated the second time V
V
upon reaching V
During this mode, V
controller logic reset level. This prevents latched faults
from being cleared unless power to the controller is
completely removed (i.e. unplugging the supply from the
AC line). There are two options available in the NCP1219,
options A and B. Option A latches off after the overload
timer expires if an overload fault is detected. In this case,
V
enabling the DRV signal until the power to the controller
is reset. On the other hand, option B has auto−retry circuitry
allowing the DRV signal to restart after a double hiccup
sequence triggered by an overload condition.
CC
CC
CC
CC(on)
CC
The controller enters a double hiccup mode if an
to discharge to V
levels. The UVLO threshold is typically 9.4 V. The
will decay below V
cycles between V
. If the fault is present or the controller is latched
CC(on)
CC
CC(hiccup)
, the controller stays in hiccup mode.
CC
increases above UVLO before the
CC(on)
CC(MIN)
never drops below 4 V, the
, typically 5.7 V. This cycle
and V
. The NCP1219 has an
ON
CC(hiccup)
CC
without
reaches