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YH09T40 40A DC-DC POL Converter
5V to 13.8V Input ? 0.6V to 3.63V Output
Data Sheet
where:
internal 50k ?
pull-up to 5V supply. It is
R TRIM = Required value of trim resistor in k ?
V OUT = Desired (trimmed) value of output voltage V
recommended to control the ON/OFF pin with an
open collector transistor or similar device.
6.4
Remote Sense (Pins 10 and 11)
If the R TRIM is not used and the Sense+ and Sense-
pins are shorted to VOUT and GND respectively, the
output voltage of the POL converter will be 0.6V. No
capacitor is allowed between Trim+ and Trim- pins.
Note that the trim resistor tolerance directly affects
the output voltage accuracy. It is recommended to
use ±0.1% trim resistors to meet the output voltage
setpoint accuracy specified in p. 4.1.
Table 1. Trim Resistor Values
The remote sense feature compensates for the
voltage drop between the output pins of the POL
converter and the load. The Sense- (Pin 10) and
Sense+ (Pin 11) pins should be connected at the
load or at the point where regulation is required
(refer to Figure 19).
If remote sensing is not required, the Sense pins
must be connected to the VOUT and GND pins
directly at the output of the POL converter.
V 0UT, V
0.6
1.0
Calculated
R TRIM , k ?
Open
3.0
Standard Value of
0.1% Resistor, k ?
Open
3.01
12,13
VIN
6
ON/OFF
YH09T40
11
SENSE+
1,2,3
VOUT
8
TRIM+
Rw
1.2
1.5
1.8
2.0
2.0
1.333
1.0
0.857
2.0
1.33
1.0
0.856
Vin
9
4,5
Power Good
GND
TRIM- 7
4,5
GND
10
SENSE-
Rw
Rload
2.5
3.3
3.63
0.631
0.444
0.396
0.634
0.442
0.397
Figure 19. Remote Sense Circuit Configuration
Because the sense leads carry minimal current,
6.3
ON/OFF (Pin 6)
large traces on the end-user board are not required.
The voltage sense traces should be located close to
The ON/OFF pin is used to turn the POL converter
ON or OFF remotely by a signal from a system
controller. For positive logic, the POL converter is
ON when the ON/OFF pin is at a logic high (2.4V
min) or left open. The POL converter is OFF when
the ON/OFF pin is at a logic low (1.2V max) or
connected to GND.
The typical connections are shown in Figure 18.
a ground plane to minimize system noise.
When using remote sense, the output voltage at the
converter can be increased by up to 0.5V in order to
maintain the required voltage at the load. However,
the maximum output voltage measured directly
between the VOUT and GND pins shall not exceed
3.63V. In addition it is the user’s responsibility to
ensure the POL converter’s actual output power
always remains at or below the maximum allowable
output power obtained from the derating curves.
12,13
VIN
YH09T40
11
SENSE+
1,2,3
VOUT
6.5
Protections
6
ON
TRIM+
8
6.5.1 Power Good
TRIM-
Vin
CONTROL
INPUT
9
4,5
Power Good
GND
GND
SENSE-
7
4,5
10
Rload
Power Good pin (Pin 9) is an open drain output,
capable of sinking up to 4mA. The Power Good pin
is high when the output voltage is within the
regulation band. The Power Good pin is at logic low
during start-up, undervoltage, overvoltage or
Figure 18. Circuit Configuration For ON/OFF Function
The ON/OFF pin is referenced to ground and
typically has 50k ? input impedance. It has an
overcurrent conditions, or when the POL converter is
disabled via the ON/OFF signal.
ZD-02095 Rev. 1.1, 18-Jun-10
www.power-one.com
Page 10 of 13
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