ICE3BR1765JZ Infineon Technologies, ICE3BR1765JZ Datasheet - Page 11

• Manufacturer Part Number: ICE3BR1765JZ
• Description: IC OFFLINE CTRLR SMPS CM DIP7
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3Rr

Specifications of ICE3BR1765JZ

• Output Isolation: Isolated
• Frequency Range: 59.8 ~ 70.2kHz
• Voltage - Input: 10.5 ~ 27 V
• Voltage - Output: 650V
• Power (watts): 44.5W
• Operating Temperature: -25°C ~ 130°C
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.4
Figure 9
In the Startup Phase, the IC provides a Soft Start
period to control the primary current by means of a duty
cycle limitation. The Soft Start function is a built-in
function and it is controlled by an internal counter.
.
Figure 10
Version 2.0
V
V
V
SoftS2
SoftS1
SoftS
Startup Phase
0 .6 7 V
S o ftS
Soft Start
Soft Start Phase
S o ft S ta r t c o u n te r
C 7
P W M O P
S o ft S ta r t
S o ft S ta r t
C o m p a r a to r
S o ft- S ta r t
x 3 .3
G 7
&
G a te D riv e r
C S
11
When the V
IC starts the Soft Start mode (see Figure 10).
The function is realized by an internal Soft Start
resistor, an current sink and a counter. And the
amplitude of the current sink is controlled by the
counter (see Figure 11).
Figure 11
After the IC is switched on, the V
controlled such that the voltage is increased step-
wisely (32 steps) with the increase of the counts. The
Soft Start counter would send a signal to the current
sink control in every 600us such that the current sink
decrease gradually and the duty ratio of the gate drive
increases gradually. The Soft Start will be finished in
20ms (T
of the Soft Start period, the current sink is switched off.
Figure 12
V
Gate
Driver
Soft Start
SOFTS32
Counter
Soft-Start
V
SoftS
Gate drive signal under Soft-Start Phase
VCC
Soft Start Circuit
) after the IC is switched on. At the end
32I
exceeds the on-threshold voltage, the
T
Soft-Start
Functional Description
8I
4I
ICE3BR1765JZ
SoftS
SFOFTS
2I
12 Nov 2009
voltage is
R
SoftS
5V
I
t
t