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STR5A162D bảng dữ liệu(PDF) 8 Page - Sanken electric

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STR5A100D Series
STR5A100D-DS Rev.1.3
SANKEN ELECTRIC CO.,LTD.
8
Aug. 08, 2014
10. Operational Description
 All of the parameter values used in these descriptions
are typical values, unless they are specified as
minimum or maximum.
 With regard to current direction, "+" indicates sink
current (toward the IC) and "–" indicates source
current (from the IC).
10.1 Startup Operation
Figure 10-1 shows the VCC pin peripheral circuit.
The IC incorporates the startup circuit. The circuit is
connected to D/ST pin. When D/ST pin voltage reaches
to Startup Circuit Operation Voltage VSTARTUP = 29 V,
the startup circuit starts operation.
During the startup process, the constant current,
ISTARTUP = − 2.1 mA, charges C4 at VCC pin. When
VCC pin voltage increases to VCC(ON) = 15.0 V, the
control
circuit
starts
switching
operation.
After
switching operation begins, the startup circuit turns off
automatically so that its current consumption becomes
zero.
The approximate startup time of IC, tSTART, is
calculated as follows:
STARTUP
)
INT
(
CC
)
ON
(
CC
START
I
V
V
4
C
t
(1)
where,
tSTART: Startup time of IC in second
VCC(INT) : Initial voltage on VCC pin in V
VAC
C2
D2
R6
C4
T1
D
P
VCC
S/GND
D/ST
4
5,6,7
2
U1
VD
C1
L1
FB 1
R3
R4
R5
Figure 10-1 VCC pin peripheral circuit
10.2 Undervoltage Lockout (UVLO)
Figure 10-2 shows the relationship of VCC pin
voltage and circuit current ICC. When VCC pin voltage
increases to VCC(ON) = 15.0 V, the control circuit starts
switching operation and the circuit current ICC increases.
When VCC pin voltage decreases to VCC(OFF) = 8.1 V,
the
control
circuit
stops
operation
by
UVLO
(Undervoltage Lockout) circuit, and reverts to the state
before startup.
Circuit current, ICC
ICC(ON)
VCC(OFF)
VCC(ON)
VCC pin
voltage
Start
Stop
Figure 10-2 Relationship between
VCC pin voltage and ICC
10.3 Auxiliary Winding
Figure 10-3 shows VCC voltage behavior during the
startup period. When VCC pin voltage increases to
VCC(ON) = 15.0 V at startup, the IC starts the operation.
Then circuit current increases and VCC pin voltage
decreases.
Since
the
Operation
Stop
Voltage
VCC(OFF) = 8.1 V is low, the auxiliary winding voltage
reaches to setting value before VCC pin voltage
decreases to VCC(OFF). Thus control circuit continues the
operation. The voltage from the auxiliary winding D in
Figure 10-1 becomes a power source to the control
circuit in operation. The approximate value of auxiliary
winding voltage is about 12 V to 16 V, taking account of
the winding turns of D winding so that VCC pin voltage
satisfies Equation (2) within the specification of input
and output voltage variation of power supply.
IC starts operation
VCC pin voltage
VCC(ON)
VCC(OFF)
Startup failure
Startup success
Target operating
voltage
Time
Increase with rising of
output voltage
Figure 10-3 VCC pin voltage during startup period


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