DI-12
For battery detection and monitoring, R11, R12 and Q2
reduce the output voltage to approximately 8 V when a 5 V
signal is applied to R12. This allows the battery voltage to
be measured, giving the state of charge.
TRANSFORMER PARAMETERS
TDK PC40 EE22/29/6-Z,
Gap for ALG = 145 nH/T2
Core Material
Bobbin
YC 2204 (Ying Chin)
Key Design Points
Primary: 56T, 30 AWG
Bias: 8T, 2 x 30 AWG
Secondary: 8T, 28 AWG T.I.W.
(T.I.W. = Triple Insulated Wire)
• The value of R3 sets the typical output current limit
Winding Details
threshold given by: R3 = 0.6 / ILIMIT
.
• Rate R3 and R5 accordingly for power dissipation (1 W).
• Ensure total voltage across R3 and R5 is greater than
1.5 V at ILIMIT if control to 0 V (output shorted) is required.
• Ensure voltage at cathode of D3 is >6 V at ILIMIT. Add
additional bias winding turns, if necessary, to maintain
output current control to 0 V (output shorted).
Winding Order
(Pin Numbers)
Primary (2-1), tape, Bias (4-3),
tape, Secondary (7,8-5,6)
Primary: 475 µH ±10%,
Leakage: 35 µH (maximum)
Inductance
Primary Resonant Frequency
300 kHz (minimum)
• RT1: Philips part # 2322-640-54472.
Table 1. Transformer Construction Information.
• Select tolerance of U2, R7, R8 and R9 to give the desired
overall CV tolerance (R7, R8 and R9 as 0.1%; R10 as 1%
and U2 as 0.5% gives overall tolerance <2%).
2.45
2.40
16
Ambient Temperature = 30 °C
2.35
14
12
Typical Limit
2.30
2.25
2.20
2.15
8
4
230 VAC
60.0
-10.0
0.0
10.0
20.0
30.0
40.0
50.0
90 VAC
0
°
Temperature ( C)
1.2
0
0.2
0.4
0.6
0.8
1.0
Figure 3. Cell Charging Voltage vs Temperature.
Output Current (A)
Figure 2. Output Characteristic (VOUT vs IOUT
)
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Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any
license under its patent rights or the rights of others. The products and applications illustrated herein (including circuits external to the
products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at www.powerint.com.
The PI Logo, TOP S w it c h , Tin yS w it c h , Lin k S w it c h and Ec o S m a rt are registered trademarks of Power Integrations, Inc.
P I Ex p e rt is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
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